期刊文献+
共找到1,838篇文章
< 1 2 92 >
每页显示 20 50 100
Experimental Study of Moso Bamboo to-Steel Connections with Embedded Grouting Materials
1
作者 Shidong Nie Wei Fu +3 位作者 Hui Wang Di Wu Min Liu Junlong Wang 《Journal of Renewable Materials》 SCIE EI 2023年第3期1401-1423,共23页
Moso bamboos have attracted excessive attention as a renewable green building material to the concept of sustainable development.In this paper,the 20 bolted Moso bamboo connection specimens with embedded steel plates ... Moso bamboos have attracted excessive attention as a renewable green building material to the concept of sustainable development.In this paper,the 20 bolted Moso bamboo connection specimens with embedded steel plates and grouting materials were designed according to connection configurations with different bolt diameters and end distance of bolt holes,and their bearing capacities and failure modes were analyzed by static tension tests.According to the test results of all connectors,the failure modes of the specimens are divided into four categories,and the effects of bolt diameter and bolt hole end distance on the connection bearing capacity and failure mode are analyzed.The test results show that the deformation and failure process can be divided into four stages.The main influence factor of connector bearing capacity is bolt diameter.Connectors can be divided into four failure modes,and brittle failure can be avoided by adopting certain structural measures.Filling with grouting material can improve the bearing capacity of joints.Due to the large variability of bamboo,further experiments are needed. 展开更多
关键词 Moso bamboo connections embedded steel plates grouting materials bearing capacities failure modes
下载PDF
Experimental Study on Ratio and Performance of Coal Gangue/Bottom Ash Geopolymer Double-Liquid Grouting Material
2
作者 Wenqi Zhao Wenbin Sun +1 位作者 Zhenbo Cao Jianbang Hao 《Journal of Renewable Materials》 EI 2023年第7期3073-3089,共17页
Mine grouting reinforcement and water plugging projects often require large amounts of grouting materials.To reduce the carbon emission of grouting material production,improve the utilization of solid waste from minin... Mine grouting reinforcement and water plugging projects often require large amounts of grouting materials.To reduce the carbon emission of grouting material production,improve the utilization of solid waste from mining enterprises,and meet the needs of mine reinforcement and seepage control,a double-liquid grouting material containing a high admixture of coal gangue powder/bottom ash geopolymer was studied.The setting time,fluidity,bleeding rate,and mechanical properties of grouting materials were studied through laboratory tests,and SEM analyzed the microstructure of the materials.The results show that the total mixture of calcined gangue does not exceed 60%.And the proportion of bottom ash replacing cement should be within 30%.At the same time,the volume mixture of sodium silicate is 20%.And the water-solid ratio does not exceed 0.6.The stability of the slurry prepared under this ratio is good.The microstructure of the stone body is dense,and its strength can meet the requirements of rock reinforcement and seepage control.Its economic and environmental benefits are more significant than the traditional cement-silicate double-liquid grouting material. 展开更多
关键词 Coal gangue municipal solid waste sodium silicate double liquid grouting material
下载PDF
Mechanical properties of anti-seepage grouting materials for heavy metal contaminated soil 被引量:3
3
作者 杨宇友 王建强 豆海军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第10期3316-3323,共8页
Cement-based composite grouting materials were used to construct grouting cutoff wall for heavy metal contaminated soil in non-ferrous metal mining areas. Cement, fly ash, and slag as principal ingredients were mixed ... Cement-based composite grouting materials were used to construct grouting cutoff wall for heavy metal contaminated soil in non-ferrous metal mining areas. Cement, fly ash, and slag as principal ingredients were mixed with water glass in different ways to produce three composite grouting materials. In order to investigate the effect of water glass mixing ratio, Baume degree, fly ash and slag contents on the mechanical properties of the composite grouting materials, particularly their gel time and compressive strength, the beaker-to-beaker method of gel time test and unconfined compressive strength test were conducted. In addition, the phase composition and microstructure of the composite grouting materials were analyzed by the X-ray diffraction(XRD) and scanning electron microscope(SEM) techniques. The test results show that their gel time increases when water glass mixing ratio and Baume degree increase. The gel time increases dramatically when fly ash is added, but decreases slightly if fly ash is partly replaced by slag. When the mixing ratio of water glass is below 20%, their compressive strength increases with the increases of the ratio; when the ratio is above 20%, it significantly decreases. The compressive strength also tends to increase as Baume degree increases, and improves if fly ash and slag are added. 展开更多
关键词 heavy metal contaminated soil composite grouting material gel time compressive strength MICROSTRUCTURE
下载PDF
Advances in memristor based artificial neuron fabrication-materials,models,and applications
4
作者 Jingyao Bian Zhiyong Liu +5 位作者 Ye Tao Zhongqiang Wang Xiaoning Zhao Ya Lin Haiyang Xu Yichun Liu 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2024年第1期27-50,共24页
Spiking neural network(SNN),widely known as the third-generation neural network,has been frequently investigated due to its excellent spatiotemporal information processing capability,high biological plausibility,and l... Spiking neural network(SNN),widely known as the third-generation neural network,has been frequently investigated due to its excellent spatiotemporal information processing capability,high biological plausibility,and low energy consumption characteristics.Analogous to the working mechanism of human brain,the SNN system transmits information through the spiking action of neurons.Therefore,artificial neurons are critical building blocks for constructing SNN in hardware.Memristors are drawing growing attention due to low consumption,high speed,and nonlinearity characteristics,which are recently introduced to mimic the functions of biological neurons.Researchers have proposed multifarious memristive materials including organic materials,inorganic materials,or even two-dimensional materials.Taking advantage of the unique electrical behavior of these materials,several neuron models are successfully implemented,such as Hodgkin–Huxley model,leaky integrate-and-fire model and integrate-and-fire model.In this review,the recent reports of artificial neurons based on memristive devices are discussed.In addition,we highlight the models and applications through combining artificial neuronal devices with sensors or other electronic devices.Finally,the future challenges and outlooks of memristor-based artificial neurons are discussed,and the development of hardware implementation of brain-like intelligence system based on SNN is also prospected. 展开更多
关键词 artificial neuron MEMRISTOR memristive materials neuron model micro-nano manufacturing spiking neural network
下载PDF
Compressive Strength of Polymer Grouting Material at Different Temperatures 被引量:9
5
作者 石明生 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第6期962-965,共4页
In order to study the influence of temperature on compressive strength of polymer grouting material,the compression specimen injection mold is self-made,and the uniaxial compressive test was carried out in the tempera... In order to study the influence of temperature on compressive strength of polymer grouting material,the compression specimen injection mold is self-made,and the uniaxial compressive test was carried out in the temperature control box under different temperatures.The change regularity of compressive strength of polymer grouting material under different temperatures and the law of volume changes of polymer samples were obtained.The experimental results show that:the compressive strength of polymer material increases with the increase of density;the temperature change has a certain influence on the compressive strength of polymer grouting material;the compressive strength decreases with temperature increases under the same density,but the compressive strength is not significantly affected by temperature when the density is less than 0.4 g/cm3;the volume change of the samples accords with the law of thermal expansion and contraction when temperature changes,and the increase of the volume is obvious when it is under high temperature.The achievements will provide an important basis to the application of the polymer grouting material. 展开更多
关键词 polymer grouting material compressive strength DENSITY TEMPERATURE VOLUME
下载PDF
A new clay-cement composite grouting material for tunnelling in underwater karst area 被引量:10
6
作者 ZHANG Cong YANG Jun-sheng +4 位作者 FU Jin-yang OU Xue-feng XIE Yi-peng DAI Yong LEI Jin-shan 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第7期1863-1873,共11页
A new clay-cement composite grouting material (CCGM) for tunnelling in underwater karst area was developed through the excellent synergistic interactions among cement, clay, meta-aluminate and lignin. The probable for... A new clay-cement composite grouting material (CCGM) for tunnelling in underwater karst area was developed through the excellent synergistic interactions among cement, clay, meta-aluminate and lignin. The probable formation mechanism of the material was proposed based on a series of experimental tests. The results show that with an optimal mass ratio (2:1:1:0.024) for water, cement, clay and additives, the obtained CCGM displayed an excellent grouting performance for karst in an underwater condition. Compared with neat cement grouts and clay-cement grouts, CCGM has faster gel time, lower bleeding rate and bulk shrinkage rate, greater initial viscosity, and a strong resistance to water dispersion. A successful engineering application indicates that CCGM not only fulfils a better grouting performance for karst in underwater conditions but also reduces the engineering cost and environmental pollution. 展开更多
关键词 tunnel karst UNDERWATER new grouting material clay-cement composite
下载PDF
Properties and Hydration Mechanism on High-strength Anchorage Grouting Material for Highway Slope 被引量:2
7
作者 TANG Hua LI Xiangguo +3 位作者 ZHANG Fachun HE Chao TAN Hongbo FANG Rui 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第6期1181-1185,共5页
The rheological and mechanical properties of high-strength anchorage grouting materials for highway slope were investigated to optimize the mix proportion. The experimental results showed that the optimized mix propor... The rheological and mechanical properties of high-strength anchorage grouting materials for highway slope were investigated to optimize the mix proportion. The experimental results showed that the optimized mix proportion of high-strength anchorage grouting material (HAGM) was C3 (FA:SP-SF= 1:2:2; AGI:AG2=3:7 and 0.03% FC), which is agreement with the limitation of JCT 986-2005. Moreover, the XRD and FTIR results showed the addition of expansive components was in favor of the formation of ettringite. The intensity of AFt oeak of the samnles increased with the increasing of hydration time. 展开更多
关键词 grouting material FLUIDITY STRENGTH HYDRATION SLOPE
下载PDF
Super-absorbent swellable polymer as grouting material for treatment of karst water inrush 被引量:4
8
作者 Shucai Li Chenyang Ma +5 位作者 Rentai Liu Mengjun Chen Jia Yan Zhenjun Wang Shaolong Duan Huasheng Zhang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2021年第5期753-763,共11页
Grouting is the most commonly used method to control water inrush in underground engineering.Traditional cement-based materials are easy to dilute and hard to coagulate under the influence of large flow and high-veloc... Grouting is the most commonly used method to control water inrush in underground engineering.Traditional cement-based materials are easy to dilute and hard to coagulate under the influence of large flow and high-velocity water inrush.To address these deficiencies,a new type of polymer grouting material with an excellent expansion ratio was synthesised.The material quickly absorbs water and has an expansion ratio of 1:300.The material is composed of a superabsorbent polymer(SAP),glycerol,and ethanol.The effects of water quality on the expansion ratio and expansion rate of the material were examined,and the best solid–liquid ratio for the slurry was determined by fluidity measurements.A karst specially designed pipeline water inrush test device showed that 800 g of SAP can achieve 0.6 m/s water flow blockage in the smooth pipeline,demonstrating that the ability of the SAP slurry to block water inrush is superior to those of other materials.This study provides a reference for water inrush plugging,and has important implications for the reduction and control of karst pipeline-type water inrush disasters,ensuring the safety of construction sites and preventing loss of life and damage to property. 展开更多
关键词 KARST Water inrush Model test grouting material Superabsorbent polymer
下载PDF
Preparation and Performance Research of Cement-based Grouting Materials with High Early Strength and Expansion 被引量:5
9
作者 张毅 LI Wei 李东旭 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第5期1115-1118,共4页
Main performance of the cement grouting materials made up by Portland cement(PC) and sulphoaluminate cement(SAC) was investigated in this program, a kind of expanding agent(EA) which was mainly constituted by me... Main performance of the cement grouting materials made up by Portland cement(PC) and sulphoaluminate cement(SAC) was investigated in this program, a kind of expanding agent(EA) which was mainly constituted by metakaolin and alunite was utilized for the compensation of the shrinkage, the hydration products and micro structure of the grouting materials were researched by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The results showed that a high expansion rate of the grouting materials could be reached as the expanding agent mixed in 6% of PC mass; the addition of SAC in the S2(PC:SAC:EA=34:6:2.25) brought a further improvement of the expansion rate of the grouting materials, the analysis of XRD and SEM showed that due to the reaction of expanding agent and SAC in the grouting materials, more ettringite crystal was generated, which resulted in a higher early strength, the addition of SAC played an expansion and strength reinforcement role in the grouting materials. 展开更多
关键词 grouting materials expanding agent sulphoaluminate cement hydration products performance research
下载PDF
Macroscopic and microscopic trans-scale characteristics of pore structure of mine grouting materials 被引量:2
10
作者 Jian-hua HU Qi-fan REN +4 位作者 Shao-wei MA Quan JIANG Yuan-jian JIANG Jun-long SHANG Zhou-quan LUO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第5期1067-1081,共15页
The pore structure and porosity of three kinds of mine grouting materials were characterized based on a thin-section analysis and low-field nuclear magnetic resonance (NMR) technique. The macroscopic pore interconnect... The pore structure and porosity of three kinds of mine grouting materials were characterized based on a thin-section analysis and low-field nuclear magnetic resonance (NMR) technique. The macroscopic pore interconnectivity was investigated using binary images captured from thin sections and a random walk pore spectral dimension (RWPSD) algorithm. The experimental results show that the microstructure of the grouting materials used consisted of interlayer pores, gel pores, capillary pores, circular air holes, and small fractures, and tailings can fill some gaps in the hydration product structure and dense hydration products. There is a positive correlation between pore interconnectivity and curing time. In addition, there is a relationship between pore interconnectivity and porosity. With increasing porosity and pore interconnectivity, a non-uniform pore structure occurs in mine grouting materials with an accelerator and results in reduced setting time and later strength. 展开更多
关键词 grouting material pore microstructure pore interconnectivity trans-scale study nuclear magnetic resonance thin-section analysis random walk pore spectral dimension
下载PDF
Experimental Evaluation of Thermal Properties of Grouting Materials
11
作者 Manuela Campanale Marta Deganello Lorenzo Moro 《Journal of Energy and Power Engineering》 2013年第8期1457-1463,共7页
This study is aimed at the thermal analysis of sealant mortar (usually a mixtures of bentonite and cemem with addition of sand) used in geothermal cooling and heating. In particular, thermal conductivity and diffusi... This study is aimed at the thermal analysis of sealant mortar (usually a mixtures of bentonite and cemem with addition of sand) used in geothermal cooling and heating. In particular, thermal conductivity and diffusivity measurements were performed on differem sealant mixtures by using Hot Disk thermal constants analyzer in order to identify the interesting thermal properties of grouting materials. The grouting materials that we considered are of porous nature and, if used in the presence of groundwater, have different levels of imbibitions. It is important to know the thermal behavior of these materials at different water content. A first set of measurements was performed on a not-tinted material at room temperature; then the samples were led to saturation conditions by contact capillary imbibitions with a cotton wool layer moistened in water. The determination of thermal conductivity in these test conditions appears to be critical compared to the measuremems on non-timed sample. The thermal conductivity tests have revealed how the thermal behavior of the samples analyzed is essentially determined by the density and water content of the material: in fact, the thermal conductivity increases of two to three times the value of the not-tinted material. 展开更多
关键词 Geothermal energy thermal conductivity sealant mortar hot disk grouting materials Portland cement mortar.
下载PDF
Grouting theories and technologies for the reinforcement of fractured rocks surrounding deep roadways 被引量:2
12
作者 Hongpu Kang Wenzhou Li +1 位作者 Fuqiang Gao Jianwei Yang 《Deep Underground Science and Engineering》 2023年第1期2-19,共18页
Grouting is an effective method to improve the integrity and stability of fractured rocks that surround deep roadways.After years of research and practice,various theories and a complete set of grouting technologies f... Grouting is an effective method to improve the integrity and stability of fractured rocks that surround deep roadways.After years of research and practice,various theories and a complete set of grouting technologies for deep roadways with fractured rocks have been developed and are widely applied in Chinese coal mining production.This paper systematically summarizes and analyzes the research results concerning the theory,design,materials,processes,and equipment for the grouting and reinforcement of fractured rocks surrounding deep roadways.Specifically,in terms of grouting methods,pregrouting,groutingwhile-excavation,and postgrouting methods are explored;in terms of grouting theory,backfill grouting,compaction grouting,infiltration grouting,and fracture grouting theories are studied.In addition,this paper also studies grouting borehole arrangement,water-cement ratio,grouting pressure,grouting volume,grout diffusion radius,and other grouting parameters and their determination methods.On this basis,this paper explores the physical and mechanical properties of organic and organic-inorganic composite grouting materials,and assess grouting reinforcement quality testing methods and instruments.Taken as the field cases,the application of pregrouting in front of heading faces,groutingwhile-excavation,and postgrouting in the Kouzidong coal mine are then introduced,and the effects of the grouting reinforcements are evaluated.This paper proposes a development direction for grouting technology based on problems existing in the grouting reinforcement of fractured rocks surrounding deep roadways. 展开更多
关键词 deep roadways development direction field study fractured rocks grouting materials grouting methods high-pressure grouting
下载PDF
Adsorption of phenol from aqueous solution by a hierarchical micro-nano porous carbon material 被引量:4
13
作者 Liu Chengbao Chen Zhigang +5 位作者 Ni Chaoying Chen Feng Gu Cheng Cao Yu Wu Zhengying Li Ping 《Rare Metals》 SCIE EI CAS CSCD 2012年第6期582-589,共8页
A hierarchical micro-nano porous carbon material (MNC) was prepared using expanded graphite (EG), sucrose, and phosphoric acid as raw materials, followed by sucrose-phosphoric acid solution impregnation, solidificatio... A hierarchical micro-nano porous carbon material (MNC) was prepared using expanded graphite (EG), sucrose, and phosphoric acid as raw materials, followed by sucrose-phosphoric acid solution impregnation, solidification, carbonization and activation. Nitrogen adsorption and mercury porosimetry show that mixed nanopores and micropores coexist in MNC with a high specific surface area of 1978 m2·g-1 and a total pore volume of 0.99 cm3·g-1. In addition, the MNC is found to consist of EG and activated carbon with the latter deposited on the interior and the exterior surfaces of the EG pores. The thickness of the activated carbon layer is calculated to be about one hundred nanometers and is further confirmed by scanning electron microscope (SEM) and transmission election microscope (TEM). A maximum static phenol adsorption of 241.2 mg·g-1 was obtained by using MNC, slightly higher than that of 220.4 mg·g-1 by using commercial activated carbon (CAC). The phenol adsorption kinetics were investigated and the data fitted well to a pseudo-second-order model. Also, an intra-particle diffusion mechanism was proposed. Furthermore, it is found that the dynamic adsorption capacity of MNC is nearly three times that of CAC. The results suggest that the MNC is a more efficient adsorbent than CAC for the removal of phenol from aqueous solution. 展开更多
关键词 micro-nano porous carbon materials expanded graphite activated carbon phenol adsorption KINETICS
下载PDF
Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks 被引量:1
14
作者 Maolin Tian Shaojie Chen +1 位作者 Lijun Han Hongtian Xiao 《Deep Underground Science and Engineering》 2024年第1期53-69,共17页
The fractured surrounding rocks of roadways pose major challenges to safe mining.Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks.The aim of ... The fractured surrounding rocks of roadways pose major challenges to safe mining.Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks.The aim of this study is to develop highly efficient composite ultrafine cement(CUC)grouts to reinforce the roadway in fractured surrounding rocks.The materials used are ultrafine cement(UC),ultrafine fly ash(UF),ultrafine slag(US),and additives(superplasticizer[SUP],aluminate ultrafine expansion agent[AUA],gypsum,and retarder).The fluidity,bleeding,shrinkage,setting time,chemical composition,microstructure,degree of hydration,and mechanical property of grouting materials were evaluated in this study.Also,a suitable and effective CUC grout mixture was used to reinforce the roadway in the fractured surrounding rock.The results have shown that the addition of UF and US reduces the plastic viscosity of CUC,and the best fluidity can be obtained by adding 40%UF and 10%US.Since UC and UF particles are small,the pozzolanic effect of UF promotes the hydration reaction,which is conductive to the stability of CUC grouts.In addition,fine particles of UC,UF,and US can effectively fill the pores,while the volumetric expansion of AUA and gypsum decreases the pores and thus affects the microstructure of the solidified grout.The compressive test results have shown that the addition of specific amounts of UF and US can ameliorate the mechanical properties of CUC grouts.Finally,the CUC22‐8 grout was used to reinforce the No.20322 belt roadway.The results of numerical simulation and field monitoring have indicated that grouting can efficaciously reinforce the surrounding rock of the roadway.In this research,high‐performance CUC grouts were developed for surrounding rock reinforcement of underground engineering by utilizing UC and some additives. 展开更多
关键词 broken surrounding rock composite ultrafine cement(CUC)grouts grouting material grouting performance grouting reinforcement
下载PDF
Theory,technology and application of grouted bolting in soft rock roadways of deep coal mines
15
作者 Hongpu Kang Jianwei Yang +4 位作者 Pengfei Jiang Fuqiang Gao Wenzhou Li Jiafeng Li Huiyuan Chen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第7期1463-1479,共17页
The grouted bolt,combining rock bolting with grouting techniques,provides an effective solution for controlling the surrounding rock in deep soft rock and fractured roadways.It has been extensively applied in numerous... The grouted bolt,combining rock bolting with grouting techniques,provides an effective solution for controlling the surrounding rock in deep soft rock and fractured roadways.It has been extensively applied in numerous deep mining areas characterized by soft rock roadways,where it has demonstrated remarkable control results.This article systematically explores the evolution of grouted bolting,covering its theoretical foundations,design methods,materials,construction processes,monitoring measures,and methods for assessing its effectiveness.The overview encompassed several key elements,delving into anchoring theory and grouting reinforcement theory.The new principle of high pretensioned high-pressure splitting grouted bolting collaborative active control is introduced.A fresh method for dynamic information design is also highlighted.The discussion touches on both conventional grouting rock bolts and cable bolts,as well as innovative grouted rock bolts and cables characterized by their high pretension,strength,and sealing hole pressure.An examination of the merits and demerits of standard inorganic and organic grouting materials versus the new inorganic–organic composite materials,including their specific application conditions,was conducted.Additionally,the article presents various methods and instruments to assess the support effect of grouting rock bolts,cable bolts,and grouting reinforcement.Furthermore,it provides a foundation for understanding the factors influencing decisions on grouted bolting timing,the sequence of grouting,the pressure applied,the volume of grout used,and the strategic arrangement of grouted rock bolts and cable bolts.The application of the high pretensioned high-pressure splitting grouted bolting collaborative control technology in a typical kilometer-deep soft rock mine in China—the soft coal seam and soft rock roadway in the Kouzidong coal mine,Huainan coal mining area,was introduced.Finally,the existing problems in grouted bolting control technology for deep soft rock roadways are analyzed,and the future development trend of grouted bolting control technology is anticipated. 展开更多
关键词 deep coal mine soft rock roadway grouted bolting rock bolt and cable grouting material high-pressure splitting grouting collaborative control technology
下载PDF
Research on rheological properties of micro-fine grouting cement 被引量:3
16
作者 管学茂 王雨利 杨雷 《Journal of Coal Science & Engineering(China)》 2003年第1期67-72,共6页
This article studies the influence of the fineness of cement, fly ash(FA), its composite admixture and the amount and way mixed with superplasticizer on the rheological properties of micro fine cement(MC). By means of... This article studies the influence of the fineness of cement, fly ash(FA), its composite admixture and the amount and way mixed with superplasticizer on the rheological properties of micro fine cement(MC). By means of modern instruments and technologies (such as XRD, SEM, laser granulometer and superficial potential apparatus etc.), the article studies the mineral compositions, the appearance character of grains, particle size distribution and superficial potential of FA and its composite materials. And through that, the reducing mechanism of FA is thoroughly analyzed. The study shows that FA and its composite admixture are excellent components which can effectively improve the rheological properties of micro fine cement, and that the superplasticizer has a saturation point and the mixing way of it has a great influence on the rheological properties. 展开更多
关键词 micro fine cement rheological properties grouting materials
下载PDF
Bolt-grouting combined support technology in deep soft rock roadway 被引量:10
17
作者 Chen Yanlong Meng Qingbin +2 位作者 Xu Guang Wu Haoshuai Zhang Guimin 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第5期777-785,共9页
Analyzing the mineral composition, mechanical properties and ground stress testing in surrounding rock,the study investigated the failure mechanism of deep soft rock roadway with high stress. The boltgrouting combined... Analyzing the mineral composition, mechanical properties and ground stress testing in surrounding rock,the study investigated the failure mechanism of deep soft rock roadway with high stress. The boltgrouting combined support system was proposed to prevent such failures. By means of FLAC3D numerical simulation and similar material simulation, the feasibility of the support design and the effectiveness of support parameters were discussed. According to the monitoring the surface and deep displacement in surrounding rock as well as bolt axial load, this paper analyzed the deformation of surrounding rock and the stress condition of the support structure. The monitor results were used to optimize the proposed support scheme. The results of field monitors demonstrate that the bolt-grouting combined support technology could improve the surround rock strength and bearing capacity of support structure, which controlled the great deformation failure and rheological property effectively in deep soft rock roadway with high stress. As a result, the long term stability and safety are guaranteed. 展开更多
关键词 Deep soft rock roadway Bolt-grouting support Numerical simulation Similar material simulation High stress
下载PDF
Engineering practice of reducing ground subsidence by grouting into overburden bed-separated and similar model experiment
18
作者 高延法 钟亚平 +2 位作者 李建民 王素华 张庆松 《Journal of Coal Science & Engineering(China)》 2007年第3期306-309,共4页
The subsidence prediction theory under the condition of grouting into bedseparated was developed. Reducing ground subsidence by grouting was carried out on eight fully-mechanized top-coal caving faces, by using the co... The subsidence prediction theory under the condition of grouting into bedseparated was developed. Reducing ground subsidence by grouting was carried out on eight fully-mechanized top-coal caving faces, by using the continuous grouting in multiple-layer to obtain experiment results of reducing subsidence under fully mining. The similar material model that can be dismantled under the condition of constant temperature and constant humidity was developed. The model was used to simulate the evolution of overburden bed-separated under such constraints of temperature and humidity, at the same time, and to test the hardening process of similar materials. 展开更多
关键词 grouting into bed-separation similar material model volume ratio of grouting to mining full-face multiple-layer continuous grouting
下载PDF
活性改性剂合成及其对环氧胶黏剂力学与界面粘接性能的影响 被引量:2
19
作者 元强 王攒 +3 位作者 姚灏 黄炬 左胜浩 黄海 《材料导报》 EI CAS CSCD 北大核心 2024年第11期296-303,共8页
综合考虑环氧胶黏剂的施工性能、力学性能及与砂浆界面的粘接性能,利用三羟甲基丙烷三缩水甘油醚(TMPGE)与1,4-丁二醇(BDO),通过控制反应物物质的量比以及反应时间制备了四种低环氧值兼具高羟基含量的预聚体(PPM)。通过1H-NMR、盐酸-丙... 综合考虑环氧胶黏剂的施工性能、力学性能及与砂浆界面的粘接性能,利用三羟甲基丙烷三缩水甘油醚(TMPGE)与1,4-丁二醇(BDO),通过控制反应物物质的量比以及反应时间制备了四种低环氧值兼具高羟基含量的预聚体(PPM)。通过1H-NMR、盐酸-丙酮法及凝胶渗透色谱(GPC)对PPM进行了表征。进一步研究了PPM对改性环氧胶黏剂工作性能、固化力学性能、与水泥砂浆粘接强度以及表面性质的影响。结果显示:延长反应时间以及增加BDO用量使PPM的数均分子量更大、环氧值更低。四种PPM改性后,胶黏剂的放热峰值温度降低,可操作时间延长。同时,PPM使环氧固化物的延性显著增加。四种PPM改性后使环氧与水的接触角降低,固化物表面的极性组分升高。XPS分析表明,PPM使环氧固化物的羟基含量显著提高。最后,PPM使胶黏剂对湿砂浆基体的粘接强度提高了一倍以上。 展开更多
关键词 环氧胶黏剂 可操作时间 裂缝修补 灌浆料 界面粘接
下载PDF
铜尾矿改性水泥基地聚合物注浆材料性能与机理分析 被引量:1
20
作者 付宏渊 姚杰 邱祥 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第3期1107-1119,共13页
为促进岩土工程绿色发展,提高尾矿资源化利用效率,选取铜尾矿制备铜尾矿改性水泥基地聚合物注浆材料,研究水固比、铜尾矿掺量、碱激发剂用量及碱激发剂模数对改性浆液各性能指标的影响规律及微观机理。研究结果表明:掺入尾矿有利于改善... 为促进岩土工程绿色发展,提高尾矿资源化利用效率,选取铜尾矿制备铜尾矿改性水泥基地聚合物注浆材料,研究水固比、铜尾矿掺量、碱激发剂用量及碱激发剂模数对改性浆液各性能指标的影响规律及微观机理。研究结果表明:掺入尾矿有利于改善改性浆液力学性能,掺入碱激发剂能提高改性浆液整体的反应程度,减小改性浆液析水率;综合考虑各项性能指标,选取改性浆液最佳配比,即水固比为1.0,铜尾矿掺量为30%(质量分数,下同),碱激发剂用量为4%,碱激发剂模数为1.6;相较于纯水泥浆液,改性浆液最佳配比黏度减小11.1%,流动度增大22.3%,析水率减小29.7%,28 d结石体抗压强度仅减小9.5%,耐久性能良好;改性浆液发生地聚合物反应形成了具有三维空间网状结构的C-A-S-H凝胶和N-A-S-H凝胶等胶凝物质。本研究成果可为岩土工程提供高性能低成本的注浆材料,同时还将为尾矿等固废材料资源化利用提供参考。 展开更多
关键词 岩土工程 注浆材料 铜尾矿 地聚合物 碱激发 微观机理
下载PDF
上一页 1 2 92 下一页 到第
使用帮助 返回顶部