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Energy evolution and structural health monitoring of coal under different failure modes:An experimental study
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作者 Yarong Xue Xueqiu He +4 位作者 Dazhao Song Zhenlei Li Majid Khan Taoping Zhong Fei Yang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第5期917-928,共12页
Structural instability in underground engineering,especially in coal-rock structures,poses significant safety risks.Thus,the development of an accurate monitoring method for the health of coal-rock bodies is crucial.T... Structural instability in underground engineering,especially in coal-rock structures,poses significant safety risks.Thus,the development of an accurate monitoring method for the health of coal-rock bodies is crucial.The focus of this work is on understanding energy evolution patterns in coal-rock bodies under complex conditions by using shear,splitting,and uniaxial compression tests.We examine the changes in energy parameters during various loading stages and the effects of various failure modes,resulting in an innovative energy dissipation-based health evaluation technique for coal.Key results show that coal bodies go through transitions between strain hardening and softening mechanisms during loading,indicated by fluctuations in elastic energy and dissipation energy density.For tensile failure,the energy profile of coal shows a pattern of “high dissipation and low accumulation” before peak stress.On the other hand,shear failure is described by “high accumulation and low dissipation” in energy trends.Different failure modes correlate with an accelerated increase in the dissipation energy before destabilization,and a significant positive correlation is present between the energy dissipation rate and the stress state of the coal samples.A novel mathematical and statistical approach is developed,establishing a dissipation energy anomaly index,W,which categorizes the structural health of coal into different danger levels.This method provides a quantitative standard for early warning systems and is adaptable for monitoring structural health in complex underground engineering environments,contributing to the development of structural health monitoring technology. 展开更多
关键词 energy dissipation structural health monitoring early warning coal-rock mechanics failure mode
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Short-circuit failure modes and mechanism investigation of 1200 V planar SiC MOSFETs
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作者 Yi Huang Qiurui Chen +7 位作者 Rongyao Ma Kaifeng Tang Qi Wang Hongsheng Zhang Ji Ding Dandan Xu Sheng Gao Genquan Han 《Journal of Semiconductors》 EI CAS CSCD 2024年第12期136-143,共8页
This paper presents a comprehensive analysis of the short-circuit failure mechanisms in commercial 1.2 kV planar sili-con carbide(SiC)metal–oxide–semiconductor field-effect transistors(MOSFETs)under 400 and 800 V bu... This paper presents a comprehensive analysis of the short-circuit failure mechanisms in commercial 1.2 kV planar sili-con carbide(SiC)metal–oxide–semiconductor field-effect transistors(MOSFETs)under 400 and 800 V bus voltage conditions.The study compares two products with varying short-circuit tolerances,scrutinizing their external characteristics and intrinsic fac-tors that influence their short-circuit endurance.Experimental and numerical analyses reveal that at 400 V,the differential ther-mal expansion between the source metal and the dielectric leads to cracking,which in turn facilitates the infiltration of liquid metal and results in a gate–source short circuit.At 800 V,the failure mechanism is markedly different,attributed to the ther-mal carrier effect leading to the degradation of the gate oxide,which impedes the device's capacity to switch off,thereby trig-gering thermal runaway.The paper proposes strategies to augment the short-circuit robustness of SiC MOSFETs at both volt-age levels,with the objective of fortifying the device's resistance to such failures. 展开更多
关键词 SiC MOSFETs short-circuit failure mode mechanical stresses cracks hot spot
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Drop failure modes of Sn-3.0Ag-0.5Cu solder joints in wafer level chip scale package 被引量:5
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作者 黄明亮 赵宁 +1 位作者 刘爽 何宜谦 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第6期1663-1669,共7页
To reveal the drop failure modes of the wafer level chip scale packages (WLCSPs) with Sn-3.0Ag-0.5Cu solder joints, board level drop tests were performed according to the JEDEC standard. Six failure modes were iden... To reveal the drop failure modes of the wafer level chip scale packages (WLCSPs) with Sn-3.0Ag-0.5Cu solder joints, board level drop tests were performed according to the JEDEC standard. Six failure modes were identified, i.e., short FR-4 cracks and complete FR-4 cracks at the printing circuit board (PCB) side, split between redistribution layer (RDL) and Cu under bump metallization (UBM), RDL fracture, bulk cracks and partial bulk and intermetallic compound (IMC) cracks at the chip side. For the outmost solder joints, complete FR-4 cracks tended to occur, due to large deformation of PCB and low strength of FR-4 dielectric layer. The formation of complete FR-4 cracks largely absorbed the impact energy, resulting in the absence of other failure modes. For the inner solder joints, the absorption of impact energy by the short FR-4 cracks was limited, resulting in other failure modes at the chip side. 展开更多
关键词 Sn-3.0Ag-0.5Cu wafer level chip scale package solder joint drop failure mode
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Mechanical model for failure modes of rock and soil under compression 被引量:2
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作者 汤连生 桑海涛 +2 位作者 宋晶 罗珍贵 孙银磊 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第10期2711-2723,共13页
The failure modes of rock and soil under compression are complex phenomena that have not been explained in a mechanical perspective. However, large amounts of studies indicate that the failure modes of rock and soil s... The failure modes of rock and soil under compression are complex phenomena that have not been explained in a mechanical perspective. However, large amounts of studies indicate that the failure modes of rock and soil samples can be categorized into eight types. In this work, the inner tensile stress and the dissipation and conversion of energy of rock and soil under compression are analyzed, then the effective conversion coefficient of energy is deduced, thus the tensile failure criterion of rock and soil under compression is established. Combined with the shear strength criterion of Mohr–Coulomb, a tensile joint shear strength criterion for rock and soil under compression is built. Therefore, a mechanical criterion model concerning the failure modes of rock and soil under compression is established and verified by tests. This model easily explains the test results in the existing literature and many natural phenomena, such as collapse. 展开更多
关键词 failure mode inner tensile stress tensile failure effective conversion coefficient of energy mechanical criteria
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Analysis of Incomplete Data of Accelerated Life Testing with Competing Failure Modes 被引量:10
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作者 TAN Yuanyuan ZHANG Chunhua CHEN Xun 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2009年第6期883-889,共7页
Data obtained from accelerated life testing (ALT) when there are two or more failure modes, which is commonly referred to as competing failure modes, are often incomplete. The incompleteness is mainly due to censori... Data obtained from accelerated life testing (ALT) when there are two or more failure modes, which is commonly referred to as competing failure modes, are often incomplete. The incompleteness is mainly due to censoring, as well as masking which might be the case that the failure time is observed, but its corresponding failure mode is not identified. Because the identification of the failure mode may be expensive, or very difficult to investigate due to lack of appropriate diagnostics. A method is proposed for analyzing incomplete data of constant stress ALT with competing failure modes. It is assumed that failure modes have s-independent latent lifetimes and the log lifetime of each failure mode can be written as a linear function of stress. The parameters of the model are estimated by using the expectation maximum (EM) algorithm with incomplete data. Simulation studies are performed to check'model validity and investigate the properties of estimates. For further validation, the method is also illustrated by an example, which shows the process of analyze incomplete data from ALT of some insulation system. Because of considering the incompleteness of data in modeling and making use of the EM algorithm in estimating, the method becomes more flexible in ALT analysis. 展开更多
关键词 accelerated life testing competing failure modes expectation maximum algorithm incomplete data Monte Carlo simulation
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Capacities and Failure Modes of Suction Bucket Foundation with Internal Bulkheads 被引量:4
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作者 XIAO Zhong GE Borui WANG Yan 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第4期627-634,共8页
Suction bucket foundations can be divided into four compartments by cruciform internal bulkheads,thereby yielding better capacity in certain conditions than those without internal bulkheads.As yet,no systematic study ... Suction bucket foundations can be divided into four compartments by cruciform internal bulkheads,thereby yielding better capacity in certain conditions than those without internal bulkheads.As yet,no systematic study has been conducted regarding the effects of cruciform internal bulkheads on the capacities of suction bucket foundations.In this study,we established a large number of finite element models of suction bucket foundations with and without cruciform internal bulkheads and of solid embedded circular foundations.We found the uniaxial capacities and failure modes of suction bucket foundations with various depth ratios to remain basically unaffected by internal bulkheads in uniform clays.However,in inhomogeneous clay with high strength heterogeneity,we observed the uniaxial moment and horizontal capacities and corresponding failure modes of suction bucket foundations with a low depth ratio to be obviously affected by internal bulkheads.In this case,the uniaxial moment capacities,in particular,as well as the horizontal capacities of suction bucket foundations with cruciform internal bulkheads become obviously greater than those without internal bulkheads.Under combined loading,we found the failure envelopes of suction bucket foundations with and without cruciform internal bulkheads and of solid circular foundation to also be basically consistent in uniform clays.However,in inhomogeneous clay with high strength heterogeneity,cruciform internal bulkheads can obviously change the shapes of the failure envelopes of bucket foundations with a small depth ratio.We conclude that when the acting vertical load or foundation depth is relatively small,suction bucket foundations with cruciform internal bulkheads can be subjected to larger moment and horizontal loads in soft clays with high strength heterogeneity. 展开更多
关键词 capacity bucket foundation internal bulkheads undrained clay failure modes
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A study of rock bolting failure modes 被引量:16
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作者 Cao Chen Jan Nemcik +1 位作者 Ren Ting Naj Aziz 《International Journal of Mining Science and Technology》 SCIE EI 2013年第1期79-88,共10页
Rock bolting has advanced rapidly during the past 4 decades due to a better understanding of load transfer mechanisms and advances made in the bolt system technology. Bolts are used as permanent and temporary support ... Rock bolting has advanced rapidly during the past 4 decades due to a better understanding of load transfer mechanisms and advances made in the bolt system technology. Bolts are used as permanent and temporary support systems in tunnelling and mining operations. A review of has indicated that three systems of reinforcement devices have evolved as part of rock bolt and ground anchor while the rock is not generally thought of as being a component of the reinforcement system. A classification of rock bolting reinforcement systems is presented, followed by the fundamental theory of the load transfer mechanism. The failure mode of two phases of rock bolting system is formularised. The failure modes of cable bolting are discussed using a bond strength model as well as an iterative method. Finally, the interfacial shear stress model for ribbed bar is introduced and a closed form solution is obtained using a tri-line stress strain relationship. 展开更多
关键词 Rock bolting failure modes Analytical solution
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Deformation and failure modes of composite foundation with sub-embankment plain concrete piles 被引量:2
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作者 Qian Su JunJie Huang 《Research in Cold and Arid Regions》 CSCD 2013年第5期614-625,共12页
With the development of high-speed railway in China, composite foundation with rigid piles has become a stamdard solution of meeting the high requirements of stability and post-construction settlement of embankment on... With the development of high-speed railway in China, composite foundation with rigid piles has become a stamdard solution of meeting the high requirements of stability and post-construction settlement of embankment on soft subgrade. Among several im- provement pattems, plain concrete piles have been extensively used to treat soft ground supported embankment. To investigate the deformation and failure modes of unimproved soft ground and soft ground reinforced by sub-embankment plain concrete piles, and to learn the influences of track and vehicle load, the effect of pile spacing, as well as the compression moduli of soil layers and upper load condition on the failure modes, a series of centrifuge model tests were performed. Test results indicate that the dis- placement of unimproved soft ground under the embankment increases continuously as embankment, track and train loading, and slip circle failure takes place. The deformation law of soft ground reinforced by sub-embankment plain concrete piles depends on pile spacing, compression modulus of the soft ground, and loading conditions. It was also found that plain concrete piles show displacement and failure patterns depending on its location, compression modulus of soft soil around the pile, and loading condi- tions. Furthermore, the evaluation of improved ground stability as well as the model test procedure is also presented. 展开更多
关键词 centrifuge model test composite foundation plain concrete pile deformation and failure modes EMBANKMENT soft ground
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STUDY OF FAILURE MODES OF MICROELECTRONIC PACKAGING MODULES BY HOLOGRAPHY QUASI PROJECTION MOIRE METHOD 被引量:1
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作者 史训清 刘宝琛 戴福隆 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 1997年第2期179-185,共7页
In this paper, a novel interferometric method with a wide range of sensitivities, called holography quasi projection moire, is proposed. It combines the features of the variated double projection moire method and the ... In this paper, a novel interferometric method with a wide range of sensitivities, called holography quasi projection moire, is proposed. It combines the features of the variated double projection moire method and the holographic interferometry method. This technique is used to study the failure modes of microelectronic packaging modules. 展开更多
关键词 HOLOGRAPHY quasi projection moire sensitivity failure modes packaging modules
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Short beam shear properties and failure modes of the wood-based X-type lattice sandwich structure 被引量:1
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作者 Tengteng Zheng Liuxiao Zou Yingcheng Hu 《Journal of Forestry Research》 SCIE CAS CSCD 2021年第2期877-887,共11页
A wood-based X-type lattice sandwich structure was manufactured by insertion-glue method.The birch was used as core,and Oriented Strand Board was used as panel of the sandwich structure.The short beam shear properties... A wood-based X-type lattice sandwich structure was manufactured by insertion-glue method.The birch was used as core,and Oriented Strand Board was used as panel of the sandwich structure.The short beam shear properties and the failure modes of the wood-based X-type lattice sandwich structure with different core direction(vertical and parallel),unit specification(120 mm×60 mm and 60 mm×60 mm),core size(50 mm and 60 mm),and drilling depth(9 mm and 12 mm)were investigated by a short beam shear test and the establishment of a theoretical model to study the equivalent shear modulus and deflection response of the X-type lattice sandwich structure.Results from the short beam shear test and the theoretical model showed that the failure modes of the wood-based X-type lattice sandwich structure were mainly the wrinkling and crushing of the panels under three-point bending load.The experimental values of deflection response of various type specimens were higher than the theoretical values of them.For the core direction of parallel,the smaller the unit specification is,the shorter the core size is,and the deeper the drilling depth is,the greater the short beam shear properties of the wood-based X-type lattice sandwich structure is. 展开更多
关键词 X-type Lattice sandwich structure failure modes Short beam shear properties Theoretical model
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LED Failure Modes Implications in Ex-e Applications 被引量:2
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作者 Roberto Sebastiano Faranda Lorenzo Fame Kim Fumagalli 《Journal of Energy and Power Engineering》 2015年第11期986-997,共12页
Design reliable and safe LED (light emitting diode) lighting equipment for potentially explosive atmospheres should require knowledge about the possible failure modes of LED sources. Nowadays, LED technology potenti... Design reliable and safe LED (light emitting diode) lighting equipment for potentially explosive atmospheres should require knowledge about the possible failure modes of LED sources. Nowadays, LED technology potential is not adequately considered by IECEx (International Electrotechnical Commission system for certification to standards relating to equipment for use in explosive atmospheres) yet. Standards only consider LEDs adequate for Zone 1 when luminary is realized by the Ex-d protection strategy, or ifa big limitation in terms of power is guarantee, for Ex-i mode. In particular, Ex-d LED luminaries are obtained by using heavy, thick and expensive flameproof enclosures, entrusting safety only to the mechanical strength of the case. Luminous efficiency's also reduced since the glass used is very thick (10% reduction of approximately every 10 mm of thickness of the glass). The paper shows a study about different possible causes of LED failure and their implication with explosive atmospheres, investigating whether LED technology can be used safely with other safety strategy like Ex-e, which can guarantee better performance and less cost. 展开更多
关键词 Luminaries power LED failure modes EX ATEX (ATmosph6res ed EXplosibles) IECEx luminous efficiency thermaldissipation.
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Geometric effects on competing failure modes in lap shear testing of spot joints
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作者 Tushar Telmasre Abdelrahman Abdelmotagaly +1 位作者 Gao Yanfei Yu Zhenzhen 《China Welding》 CAS 2022年第3期8-16,共9页
When subjected to the lap shear testing,spot welds created by brazing,resistance welding,or other techniques may fail either by a plug failure mode(also called pull-out mode)or an interfacial shear failure mode.In the... When subjected to the lap shear testing,spot welds created by brazing,resistance welding,or other techniques may fail either by a plug failure mode(also called pull-out mode)or an interfacial shear failure mode.In the past,plug failure mode was thought to be dependent on base metal ultimate tensile strength,spot diameter and plate thickness,while interfacial failure can be determined by interface shear strength and spot area.No fracture mechanics model or failure process is invoked in such an approach,and its predictive capability is often doubted compared to realistic experiments.This work conducts a parametric study to assess the failure behavior as a function of dominant three-dimensional geometric parameters based on the Gurson-Tvergaard-Needleman(GTN)damage mechanics model and no-damage model respectively.Different necking conditions are considered as precursors to the two failure modes in the no-damage model.It is found out that a small ratio of spot diameter to plate thickness promotes interfacial shear failure while a large ratio favors plug failure.Other geometric parameters such as the filler interlayer thickness,if used,play a secondary role.The calculated peak force F_(wt)is not much different between the GTN and no-damage analyses,and better agreement is shown in the small nugget region.Normalized peak force calculated from the GTN model with the porosity f_(0)set to 0.01 showed the best agreement with pervious tensile shear tests on spot-welded DP980 lap joints in comparison to that calculated from the GTN model with f_(0)at 0.02 and the no-damage model.Note that heterogeneous distribution of material strength across the joint region was considered in the GTN model,which was estimated based on the hardness map measured across the joint cross section. 展开更多
关键词 spot welding failure modes damage mechanics
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Analysis of Potential Failure Modes in an Assembly Line by Fuzzy Expert Systems
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作者 Mehdi Piltan Reza Ghodsi +1 位作者 Foad Quarashi Mehrdad Azizian 《Journal of Mechanics Engineering and Automation》 2011年第6期445-449,共5页
The failure modes and effects analysis (FMEA) is widely applied in manufacturing industries in various phases of the product life cycle to evaluate the system, its design and processes for failures that can occur. T... The failure modes and effects analysis (FMEA) is widely applied in manufacturing industries in various phases of the product life cycle to evaluate the system, its design and processes for failures that can occur. The FMEA team often demonstrates different opinions and these different types of opinions are very difficult to incorporate into the FMEA by the traditional risk priority number model. In this paper, for each of the Occurrence, Severity and Detectivity parameters a fuzzy set is defined and the opinion of each FMEA team members is considered. These opinions are considered simultaneously with weights that are given to each individual based on their skills and experience levels. In addition, the opinion of the costumer is considered for each of the FMEA parameters. Then, the Risk Priority Numbers (RPN) is calculated using a Multi Input Single Output (MISO) fuzzy expert system. The proposed model is applied for prioritizing the failures of Peugeot 206 Engine assembly line in IKCo (Iran Khodro Company). 展开更多
关键词 FMEA failure modes and effects analysis) fuzzy expert systems engine assembly line.
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Pressure-impulse diagram with multiple failure modes of one-way reinforced concrete slab under blast loading using SDOF method 被引量:9
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作者 汪维 张舵 +2 位作者 卢芳云 汤福静 王松川 《Journal of Central South University》 SCIE EI CAS 2013年第2期510-519,共10页
Two loosely coupled single degree of freedom (SDOF) systems were used to model the flexural and direct shear responses of one-way reinforced concrete slabs subjected to explosive loading. Blast test results show that ... Two loosely coupled single degree of freedom (SDOF) systems were used to model the flexural and direct shear responses of one-way reinforced concrete slabs subjected to explosive loading. Blast test results show that the SDOF systems are accurate in predicting the failure mode of the slab under blast loads by incorporating the effects of the strain rate effect caused by rapid load application. Based on different damage criteria, pressure-impulse (P-I) diagrams of the two failure modes were analyzed with the SDOF systems. The effects of span length, concrete strength, and reinforcement ratio of the slab on the P-I diagram were also investigated. Results indicate that a slab tends to fail in direct shear mode when it is of a smaller span length and tends to fail in flexure mode when it is of a larger span length. With the increase of the concrete strength or reinforced ratio, both the flexure and shear capacity increase. Based on numerical results, a simplified method and a semi analytical equation for deriving the P-I diagram are proposed for different failure modes and damage levels. 展开更多
关键词 blast load failure mode pressure impulse diagram One-way reinforced concrete slab single degree of freedom
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Failure Modes for Single-Layer Reticulated Domes Under Impact Loads 被引量:5
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作者 范峰 王多智 +1 位作者 支旭东 沈世钊 《Transactions of Tianjin University》 EI CAS 2008年第B10期545-550,共6页
The paper presents the theory of Hamilton variation principle which is the current method for impact problem, central difference method which is efficient solution of finite element (FE) method for impact problem and ... The paper presents the theory of Hamilton variation principle which is the current method for impact problem, central difference method which is efficient solution of finite element (FE) method for impact problem and adapts to solve non-linear dynamic problem. And it introduces the ANSYS/LS-DYNA which is the popular FE software for impact problem both at home and abroad. Then it gives solutions for one simple model by analytical method and ANSYS/LS-DYNA respec-tively to validate function of software, and they are consistent. Afterward, it gives model of single-layer Kiewitt reticulated dome with a span of 60 m, and the cylinder impactor, and introduces the contact interface arithmetic, especially the material model of steel (piecewise linear plasticity model) which takes stain rate into account and makes steel failure stress higher under impact loads. The vertical displacement, stress in main members, and the plastic deformation for dome under impact loads were obtained. Then four failure modes (no failure, moderate failure, global failure and slight failure) were summarized according to the rules of dynamic response. And the characteristics of dynamic response for each failure mode were shown. 展开更多
关键词 reticulated domes IMPACT Hamilton variation principle failure mode plastic deformation
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Testing Studies on Rock Failure Modes of Statically Loads Under Dynamic Loading 被引量:4
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作者 叶洲元 李夕兵 +2 位作者 刘希灵 马春德 尹土兵 《Transactions of Tianjin University》 EI CAS 2008年第B10期530-535,共6页
By means of the improved split Hopkionson pressure bar(SHPB) with axial pre-pressure and confined pressure, two series of experiments on sandstone are carried out to research the failure mode of rock during the course... By means of the improved split Hopkionson pressure bar(SHPB) with axial pre-pressure and confined pressure, two series of experiments on sandstone are carried out to research the failure mode of rock during the course of exploitation of resources in deep. One is under the conditions that the con-fining pressure is fixed and the axial pressure is changeable. The other is under the conditions that the confining pressure becomes and the axial pressure is fixed. It is found that samples break up evenly after impacting when axial static pressures are low, there is great disparity in size of fragments when axial static pressures are high, and the main bodies of samples after the tests under the combination of dy-namic and static loads frequently show the type of V or X. The samples are more close-grained at the elastic stage and impacts make many cracks be generated and developed, as makes samples more crackable. At the initial phase of damage stage, the static pressures make some cracks in the samples which are undeveloped and the impacts′ role is similar to that at the elastic stage. At the metaphase or anaphase of damage stage, these cracks in the samples develop adequately and the impacts mainly accelerate samples′ failure. The main bodies of samples show the type of V or X after impacting due to the confining pressures′ restraining samples′ lateral formation at the elastic stage or the initial phase of damage stage, the main bodies of samples have almost formed at the stage loading static pressures and the results after impacting usually are similar to those under the axial pressures tests. 展开更多
关键词 Hopkinson combination of static and dynamic loads DAMAGE failure mode
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Seismic failure modes and seismic safety of Hardfill dam 被引量:6
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作者 Kun XIONG Yong-hong WENG Yun-long H 《Water Science and Engineering》 EI CAS CSCD 2013年第2期199-214,共16页
Based on microscopic damage theory and the finite element method, and using the Weibull distribution to characterize the random distribution of the mechanical properties of materials, the seismic response of a typical... Based on microscopic damage theory and the finite element method, and using the Weibull distribution to characterize the random distribution of the mechanical properties of materials, the seismic response of a typical Hardfill dam was analyzed through numerical simulation during the earthquakes with intensities of 8 degrees and even greater. The seismic failure modes and failure mechanism of the dam were explored as well. Numerical results show that the Hardfill dam remains at a low stress level and undamaged or slightly damaged during an earthquake with an intensity of 8 degrees. During overload earthquakes, tensile cracks occur at the dam surfaces and extend to inside the dam body, and the upstream dam body experiences more serious damage than the downstream dam body. Therefore, under the seismic conditions, the failure pattern of the Hardfill dam is the tensile fracture of the upstream regions and the dam toe. Compared with traditional gravity dams, Hardfill dams have better seismic performance and ~reater seismic safety. 展开更多
关键词 Hardfill dam seismic failure mode seismic safety microscopic damage model
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Development characteristics and failure modes of reactivated ancient landslides in the Sichuan–Tibet transportation corridor,China 被引量:1
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作者 WU Rui-an ZHANG Yong-shuang +5 位作者 GUO Chang-bao REN San-shao YAO Xin LIU Xiao-yi YANG Zhi-hua DU Guo-liang 《Journal of Mountain Science》 SCIE CSCD 2023年第12期3596-3613,共18页
The risk of reactivated ancient landslides in the Sichuan–Tibet transportation corridor in China is significantly increasing,primarily driven by the intensification of engineering activities and the increased frequen... The risk of reactivated ancient landslides in the Sichuan–Tibet transportation corridor in China is significantly increasing,primarily driven by the intensification of engineering activities and the increased frequency of extreme weather events.This escalation has resulted in a considerable number of fatalities and extensive damage to critical engineering infrastructure.However,the factors contributing to the reactivation and modes of destruction of ancient landslides remain unknown.Therefore,it is imperative to systematically analyze the developmental characteristics and failure modes of reactivated ancient landslides to effectively mitigate disaster risks.Based on a combination of data collection,remote sensing interpretation,and field investigations,we delineated the developmental attributes of typical ancient landslides within the study area.These attributes encompass morphological and topographic aspects,material composition,and spatial structure of ancient landslides.Subsequently,we identified the key triggers for the reactivation of ancient landslides,including water infiltration,reservoir hydrodynamics,slope erosion,and excavation,by analyzing representative cases in the study area.Reactivation of ancient landslides is sometimes the result of the cumulative effects of multiple predisposing factors.Furthermore,our investigations revealed that the reactivation of these ancient landslides primarily led to local failures.However,over extended periods of dynamic action,the entire zone may experience gradual creep.We categorized the reactivation modes of ancient landslides into three distinct types based on the reactivation sequences:progressive retreat,backward thrusting,and forward pulling–backward thrusting.This study is of great significance for us to identify ancient landslides,deepen our understanding of the failure modes and risks of reactivated ancient landslides on the eastern margin of the Tibetan Plateau,and formulate effective disaster prevention and mitigation measures. 展开更多
关键词 Ancient landslide Reactivation characteristic Triggering factor failure mode Sichuan-Tibet transportation corridor Eastern Tibetan Plateau
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Failure modes and slabbing mechanisms of hard rock with different height-to-width ratios under uniaxial compression 被引量:1
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作者 Yu-zhe ZHAO Lin-qi HUANG +3 位作者 Xi-bing LI Chong-jin LI Zheng-hong CHEN Zhi-wei CAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第11期3699-3713,共15页
To determine the relationship between slabbing failure and the specimen height-to-width(H/W)ratio and to analyze the conditions,characteristics,and mechanism of slabbing failure in the laboratory,uniaxial compression ... To determine the relationship between slabbing failure and the specimen height-to-width(H/W)ratio and to analyze the conditions,characteristics,and mechanism of slabbing failure in the laboratory,uniaxial compression tests were conducted using six groups of granite specimens.The entire failure process was recorded using strain gauges and high-speed cameras.The initiation and propagation of fractures in specimens were identified by analyzing the monitoring results of stress,strain,and acoustic emission.The experimental results show that changes in the specimen H/W ratio can transform the macro failure mode.When the H/W ratio is reduced to 0.5,the macro failure mode is dominated by slabbing.Low load-bearing ability is observed in specimens with slabbing failure,and the slabbing fractures are approximately parallel to the loading direction.Moreover,the fracture propagation characteristics and acoustic emission signals of slabbing failure specimens show typical tensile failure characteristics,indicating that slabbing failure is essentially a special tensile failure. 展开更多
关键词 hard rock failure mode slabbing failure acoustic emission tensile wing fracture
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Prediction of column failure modes based on artificial neural network 被引量:1
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作者 Wan Haitao Qi Yongle +2 位作者 Zhao Tiejun Ren Wenjuan Fu Xiaoyan 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2023年第2期481-493,共13页
To implement the performance-based seismic design of engineered structures,the failure modes of members must be classified.The classification method of column failure modes is analyzed using data from the Pacific Eart... To implement the performance-based seismic design of engineered structures,the failure modes of members must be classified.The classification method of column failure modes is analyzed using data from the Pacific Earthquake Engineering Research Center(PEER).The main factors affecting failure modes of columns include the hoop ratios,longitudinal reinforcement ratios,ratios of transverse reinforcement spacing to section depth,aspect ratios,axial compression ratios,and flexure-shear ratios.This study proposes a data-driven prediction model based on an artificial neural network(ANN)to identify the column failure modes.In this study,111 groups of data are used,out of which 89 are used as training data and 22 are used as test data,and the ANN prediction model of failure modes is developed.The results show that the proposed method based on ANN is superior to traditional methods in identifying the column failure modes. 展开更多
关键词 performance-based seismic design failure mode COLUMN artificial neural network prediction model
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