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The Deformation and Stress Analysis of Na Ba Reservoir Concrete Face Rock-Fill Dam
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作者 Yin Shaofei Peng Hui +3 位作者 Wu Fan Wen Chen Jin Ke Han Kai 《Journal of Environmental Science and Engineering(B)》 2016年第10期489-494,共6页
Based on the APDL (ANSYS Parametric Design Language) and combined with the actual project related to parameters of filling material, imported Duncan-Chang constitutive model which has been widely applied in soil mas... Based on the APDL (ANSYS Parametric Design Language) and combined with the actual project related to parameters of filling material, imported Duncan-Chang constitutive model which has been widely applied in soil mass and rock-fill in the ANSYS software. With the three-dimensional nonlinear finite element analysis by the mid-point incremental method, what have been computed are the deformation and stress analysis ofNa Ba reservoir CFRD (Concrete Face Rock-fill Dam) in filling period. The calculation results provide practical reference for the dam during construction safety filling stress and deformation analysis and real-time monitoring. 展开更多
关键词 concrete face rock-fill dam deformation and stress analysis Duncan-Chang constitutive model nonlinear finite element analysis.
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Refined mathematical model for the breaching of concrete-face sand-gravel dams due to overtopping failure
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作者 QIU Wen LI Yan-long +2 位作者 WEN Li-feng WANG Jing YIN Qiao-gang 《Journal of Mountain Science》 SCIE CSCD 2023年第3期670-687,共18页
Overtopping is one of the main reasons for the breaching of concrete-face sand-gravel dams(CFSGDs).In this study,a refined mathematical model was established based on the characteristics of the overtopping breaching o... Overtopping is one of the main reasons for the breaching of concrete-face sand-gravel dams(CFSGDs).In this study,a refined mathematical model was established based on the characteristics of the overtopping breaching of CFSGDs.The model characteristics were as follows:(1)Based on the Renormailzation Group(RNG)k-εturbulence theory and volume of fluid(VOF)method,the turbulent characteristics of the dam-break flow were simulated,and the erosion surface of the water and soil was tracked;(2)In consideration of the influence of the change in the sediment content on the dam-break flow,the dam material transport equation,which could reflect the characteristics of particle settlement and entrainment motion,was used to simulate the erosion process of the sand gravels;(3)Based on the bending moment balance method,a failure equation of the concrete face slab under dead weight and water load was established.The proposed model was verified through a case study on the failure of the Gouhou CFSGD.The results showed that the proposed model could well simulate the erosion mode of the special vortex flow of the CFSGD scouring the support body of the concrete face slab inward and reflect the mutual coupling relationship between the dam-break flow,sand gravels,and concrete face slabs.Compared with the measured values,the relative errors of the peak discharge,final breach average width,dam breaching duration,and maximum failure length of the face slab calculated using the proposed model were all less than 12%,thus verifying the rationality of the model.The proposed model was demonstrated to perform better and provide more detailed results than three selected parametric models and three simplified mathematical models.The study results can aid in establishing the risk level and devising early warning strategies for CFSGDs. 展开更多
关键词 concrete-face sand-gravel dam OVERTOPPING dam-break flow concrete face slab failure Refined mathematical model
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Numerical simulation of seismic damage and cracking of concrete slabs of high concrete face rockfill dams 被引量:7
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作者 Wei-jun Cen Lang-sheng Wen +1 位作者 Zi-qi Zhang Kun Xiong 《Water Science and Engineering》 EI CAS CSCD 2016年第3期205-211,共7页
Based on the damage constitutive model for concrete, the Weibull distribution function was used to characterize the random distribution of the mechanical properties of materials by finely subdividing concrete slab ele... Based on the damage constitutive model for concrete, the Weibull distribution function was used to characterize the random distribution of the mechanical properties of materials by finely subdividing concrete slab elements, and a concrete random mesoscopic damage model was established. The seismic response of a 100-m high concrete face rockfill dam(CFRD), subjected to ground motion with different intensities, was simulated with the three-dimensional finite element method(FEM), with emphasis on exploration of damage and the cracking process of concrete slabs during earthquakes as well as analysis of dynamic damage and cracking characteristics during strong earthquakes. The calculated results show that the number of damaged and cracking elements on concrete slabs grows with the duration of earthquakes. With increasing earthquake intensity, the damaged zone and cracking zone on concrete slabs grow wider. During a 7.0-magnitude earthquake, the stress level of concrete slabs is low for the CFRD, and there is almost no damage or slight damage to the slabs. While during a 9.0-magnitude strong earthquake, the percentages of damaged elements and macrocracking elements continuously ascend with the duration of the earthquake, peaking at approximately 26% and 5% at the end of the earthquake, respectively. The concrete random mesoscopic damage model can depict the entire process of sprouting, growing, connecting, and expanding of cracks on a concrete slab during earthquakes. 展开更多
关键词 concrete face ROCKFILL dam Random MESOSCOPIC damAGE model SEISMIC response Dynamic damAGE to concrete SLAB Macrocracking Numerical simulation
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Seismic responses of high concrete face rockfill dams:A case study 被引量:6
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作者 Sheng-shui Chen Zhong-zhi Fu +1 位作者 Kuang-ming Wei Hua-qiang Han 《Water Science and Engineering》 EI CAS CSCD 2016年第3期195-204,共10页
Seismic responses of the Zipingpu concrete face rockfill dam were analyzed using the finite element method. The dynamic behavior of rockfill materials was modeled with a viscoelastic model and an empirical permanent s... Seismic responses of the Zipingpu concrete face rockfill dam were analyzed using the finite element method. The dynamic behavior of rockfill materials was modeled with a viscoelastic model and an empirical permanent strain model. The relevant parameters were obtained either by back analysis using the field observations or by reference to parameters of similar rockfill materials. The acceleration responses of the dam,the distribution of earthquake-induced settlement, and the gap propagation under the concrete slabs caused by the settlement of the dam were analyzed and compared with site investigations or relevant studies. The mechanism of failure of horizontal construction joints was also analyzed based on numerical results and site observations. Numerical results show that the input accelerations were considerably amplified near the top of the dam, and the strong shaking resulted in considerable settlement of the rockfill materials, with a maximum value exceeding 90 cm at the crest.As a result of the settlement of rockfill materials, the third-stage concrete slabs were separated from the cushion layer. The rotation of the cantilever slabs about the contacting regions, under the combined action of gravity and seismic inertial forces, led to the failure of the construction joints and tensile cracks appeared above the construction joints. The effectiveness and limitations of the so-called equivalent linear method are also discussed. 展开更多
关键词 concrete face ROCKFILL dam (CFRD) SEISMIC response Zipingpu PERMANENT strain Construction joint VISCOELASTIC model Finite element method
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Prediction of Concrete Faced Rock Fill Dams Settlements Using Genetic Programming Algorithm 被引量:3
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作者 Seyed Morteza Marandi Seyed Mahmood VaeziNejad Elyas Khavari 《International Journal of Geosciences》 2012年第3期601-609,共9页
In the present study a Genetic Programing model (GP) proposed for the prediction of relative crest settlement of concrete faced rock fill dams. To this end information of 30 large dams constructed in seven countries a... In the present study a Genetic Programing model (GP) proposed for the prediction of relative crest settlement of concrete faced rock fill dams. To this end information of 30 large dams constructed in seven countries across the world is gathered with their reported settlements. The results showed that the GP model is able to estimate the dam settlement properly based on four properties, void ratio of dam’s body (e), height (H), vertical deformation modulus (Ev) and shape factor (Sc) of the dam. For verification of the model applicability, obtained results compared with other research methods such as Clements’s formula and the finite element model. The comparison showed that in all cases the GP model led to be more accurate than those of performed in literature. Also a proper compatibility between the GP model and the finite element model was perceived. 展开更多
关键词 concrete FACED rock-fill damS SETTLEMENT Genetic Programming ALGORITHM Finite Element Model
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Dynamic response of concrete face rockfill dam affected by polarity reversal of near-fault earthquake 被引量:3
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作者 Jiang Qiuting Zou Degao +1 位作者 Han Huichao Liu Jingmao 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2022年第1期81-99,共19页
In China,an increasing number of high concrete face rockfill dams(CFRDs)are located in high intensity earthquake zones,some of which are close to the seismic fault line.Recordings suggest that near-fault ground motion... In China,an increasing number of high concrete face rockfill dams(CFRDs)are located in high intensity earthquake zones,some of which are close to the seismic fault line.Recordings suggest that near-fault ground motions are characterized by large one-sided velocity pulses.The conventional dynamic analysis of dams,however,neglects the features of strong ground movements.In this study,under different ground motion levels some numerical dynamic studies considering the one-sided broadband pulses of near-fault earthquakes are presented for CFRDs based on a generalized plasticity model for rockfill materials.The results indicate that the displacements of dam crest corresponding to positive and reverse input of near-fault ground motion make a significant difference,while the displacements of the dam crest under artificial seismic waves are similar.Furthermore,using the horizontal and vertical components as simultaneous excitations near the faults,the displacements of the dam crest before and after reversing the motion produce a larger difference than that using a single component.More importantly,the difference of horizontal displacements of the dam crest caused by polarity reversal of near-fault ground motions increases with the increase of earthquake intensity.Due to the randomness and uncertainties of earthquakes,using a stochastic near-field motion input as excitation without considering the polarity(i.e.,positive vs reversed waveform),does not necessarily obtain a conservative result. 展开更多
关键词 near-fault ground motion polarity high concrete face rockfill dam dynamic response
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Fuzzy Earthwork Dynamic Allocation and Optimization for Construction of High Concrete Face Rockfill Dam 被引量:2
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作者 刘宁 崔博 钟登华 《Transactions of Tianjin University》 EI CAS 2012年第6期426-431,共6页
Due to the complexity of earthwork allocation system for the construction of high concrete face rockfill dam,traditional allocation and planning are not able to function properly in the construction process with stron... Due to the complexity of earthwork allocation system for the construction of high concrete face rockfill dam,traditional allocation and planning are not able to function properly in the construction process with strong randomness.In this paper,the working mechanism of earthwork dynamic allocation system is analyzed comprehensively and a solution to fuzzy earthwork dynamic allocation is proposed on the basis of uncertain factors in the earthwork allocation of a hydropower project.Under the premise of actual situation and the experience of the construction site,an all-coefficient-fuzzy linear programming mathematical model with fuzzy parameters and constraints for earthwork allocation is established according to the structure unit weighted ranking criteria.In this way,the deficiency of certain allocation model can be overcome.The application results indicate that the proposed method is more rational compared with traditional earthwork allocation. 展开更多
关键词 high concrete face rockfill dam fuzzy number earthwork dynamic allocation structure unit weighted ranking
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A simplified physically-based breach model for a high concrete-faced rockfill dam:A case study 被引量:5
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作者 Qi-ming Zhong Sheng-shui Chen Zhao Deng 《Water Science and Engineering》 EI CAS CSCD 2018年第1期46-52,共7页
A simplified physically-based model was developed to simulate the breaching process of the Gouhou concrete-faced rockfill dam (CFRD), which is the only breach case of a high CFRD in the world. Considering the dam he... A simplified physically-based model was developed to simulate the breaching process of the Gouhou concrete-faced rockfill dam (CFRD), which is the only breach case of a high CFRD in the world. Considering the dam height, a hydraulic method was chosen to simulate the initial scour position on the downstream slope, with the steepening of the downstream slope taken into account; a headcut erosion formula was adopted to simulate the backward erosion as well. The moment equilibrium method was utilized to calculate the ultimate length of a concrete slab under its self-weight and water loads. The calculated results of the Gouhou CFRD breach case show that the proposed model provides reasonable peak breach flow, final breach width, and failure time, with relative errors less than 15% as compared with the measured data. Sensitivity studies show that the outputs of the proposed model are more or less sensitive to different parameters. Three typical parametric models were compared with the proposed model, and the comparison demonstrates that the proposed physically-based breach model performs better and provides more detailed results than the parametric models. 展开更多
关键词 concrete-faced rockfill dam Physically-based breach model Parametric breach model Sensitivity analysis Gouhou CFRD
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Seepage simulation of high concrete-faced rockfill dams based on generalized equivalent continuum model 被引量:6
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作者 Shou-kai Chen Qi-dong He Ji-gang Cao 《Water Science and Engineering》 EI CAS CSCD 2018年第3期250-257,共8页
This research focused on the three-dimensional(3 D) seepage field simulation of a high concrete-faced rockfill dam(CFRD) under complex hydraulic conditions. A generalized equivalent continuum model of fractured rock m... This research focused on the three-dimensional(3 D) seepage field simulation of a high concrete-faced rockfill dam(CFRD) under complex hydraulic conditions. A generalized equivalent continuum model of fractured rock mass was used for equivalent continuous seepage field analysis based on the improved node virtual flow method. Using a high CFRD as an example, the generalized equivalent continuum range was determined, and a finite element model was established based on the terrain and geological conditions, as well as structural face characteristics of the dam area. The equivalent seepage coefficients of different material zones or positions in the dam foundation were calculated with the Snow model or inverse analysis. Then, the 3 D seepage field in the dam area was calculated under the normal water storage conditions, and the corresponding water head distribution, seepage flow, seepage gradient, and seepage characteristics in the dam area were analyzed. The results show that the generalized equivalent continuum model can effectively simulate overall seepage patterns of the CFRD under complex hydraulic conditions and provide a reference for seepage analysis of similar CFRDs. 展开更多
关键词 concrete-faced ROCKFILL dam(CFRD) GENERALIZED equivalent CONTINUUM model Node virtual flow method Fractured rock mass SEEPAGE field SEEPAGE coefficient
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Reservoir water effects on earthquake performance evaluation of Torul Concrete-Faced Rockfill Dam
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作者 Alemdar BAYRAKTAR Murat Emre KARTAL Hasan Basri BASAGA 《Water Science and Engineering》 EI CAS 2009年第1期43-57,共15页
This study presents earthquake performance analysis of the Torul Concrete-Faced Rockfill (CFR) Dam with two-dimensional dam-soil and dam-soil-reservoir finite element models. The Lagrangian approach was used with fl... This study presents earthquake performance analysis of the Torul Concrete-Faced Rockfill (CFR) Dam with two-dimensional dam-soil and dam-soil-reservoir finite element models. The Lagrangian approach was used with fluid elements to model impounded water. The interface elements were used to simulate the slippage between the concrete face slab and the rockfill. The horizontal component of the 1992 Erzincan earthquake, with a peak ground acceleration of 0.515g, was considered in time-history analysis. The Drucker-Prager model was preferred in nonlinear analysis of the concrete slab, rockfill and foundation soil. The maximum principal stresses and the maximum displacements in two opposite directions were compared by the height of the concrete slab according to linear time-history analysis to reveal the effect of reservoir water. The changes of critical displacements and principal stresses with time are also shown in this paper. According to linear and nonlinear time-history analysis, the effect of the reservoir water on the earthquake performance of the Torul CFR Dam was investigated and the possible damage situation was examined. The results show that the hydrodynamic pressure of reservoir water leads to an increase in the maximum displacements and principal stresses of the dam and reduces the earthquake performance of the dam. Although the linear time-history analysis demonstrates that the earthquake causes a momentous damage to the concrete slab of the Torul CFR Dam, the nonlinear time-history analysis shows that no evident damage occurs in either reservoir case. 展开更多
关键词 earthquake performance evaluation concrete-faced rockfill dam dam-soil-reservoir interaction Drucker-Prager model interface element Lagrangian approach nonlinear time-history analysis
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Parameter sensitivity and inversion analysis of a concrete faced rock-fill dam based on HS-BPNN algorithm 被引量:9
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作者 SUN PengMing BAO TengFei +3 位作者 GU ChongShi JIANG Ming WANG Tian SHI ZhongWen 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2016年第9期1442-1451,共10页
Considering the complex nonlinear relationship between the material parameters of a concrete faced rock-fill dam(CFRD) and its displacements, the harmony search(HS) algorithm is used to optimize the back propagation n... Considering the complex nonlinear relationship between the material parameters of a concrete faced rock-fill dam(CFRD) and its displacements, the harmony search(HS) algorithm is used to optimize the back propagation neural network(BPNN), and the HS-BPNN algorithm is formed and applied for the inversion analysis of the parameters of rock-fill materials. The sensitivity of the parameters in the Duncan and Chang's E-B model is analyzed using the orthogonal test design. The case study shows that the parameters φ0, K, Rf, and Kb are sensitive to the deformation of the rock-fill dam and the inversion analysis for these parameters is performed by the HS-BPNN algorithm. Compared with the traditional BPNN, the HS-BPNN algorithm exhibits the advantages of high convergence precision, fast convergence rate, and strong stability. 展开更多
关键词 parameter sensitivity analysis harmony search algorithm back propagation neural network parameter inversion concrete faced rock-fill dam
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Key technical problems of extra-high concrete faced rock-fill dam 被引量:2
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作者 MA HongQi1? & CAO KeMing2 1Yunnan Huaneng Lancang River Hydropower Co., Ltd., Kunming 650011, China 2East China Investigation, Design & Research Institute, Hangzhou 310014, China 《Science China(Technological Sciences)》 SCIE EI CAS 2007年第z1期20-33,共14页
This paper summarizes the main technical points related to 100 m-height-scale concrete faced rock-fill dams and analyzes the main problems and their causes occurring during construction of 200 m-height-scale concrete ... This paper summarizes the main technical points related to 100 m-height-scale concrete faced rock-fill dams and analyzes the main problems and their causes occurring during construction of 200 m-height-scale concrete faced rock-fill dams. This paper has raised the key technical problems which need to study for construction of 300 m-height-scale concrete faced rock-fill dams based on the main experiences on the extra-high concrete faced rock-fill dams built after the year of 2000. 展开更多
关键词 concrete FACED rock-fill dam extra-high dam KEY TECHNOLOGY
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超深覆盖层上面板坝防渗墙连接板接缝变形机制及优化分析
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作者 邹德高 屈永倩 +3 位作者 孔宪京 常哲瑜 刘京茂 陈楷 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第5期1089-1096,共8页
针对超深软弱覆盖层上的面板坝工程止水缝安全问题,从变形和应力2个方面开展优化研究,揭示了防渗墙连接板趾板面板防渗体系的变形模式,定位了薄弱位置,提出了优化方案,并量化了工程应用效果.结果表明,防渗墙与趾板间沉降差集中在防渗墙... 针对超深软弱覆盖层上的面板坝工程止水缝安全问题,从变形和应力2个方面开展优化研究,揭示了防渗墙连接板趾板面板防渗体系的变形模式,定位了薄弱位置,提出了优化方案,并量化了工程应用效果.结果表明,防渗墙与趾板间沉降差集中在防渗墙与连接板之间的止水缝处,设置多块连接板无法起到逐步过渡沉降差的作用.防渗墙下游侧设置侧向支撑、制作倾斜形止水缝、趾板下设支撑墙均可减小防渗墙连接板间止水缝沉陷变形.相比垂直止水缝和多块连接板的传统方案,所提的防渗墙顶部拓宽连接板倾斜形止水缝以及防渗墙顶部拓宽倾斜形止水缝趾板下设支撑墙的深厚覆盖层上面板坝防渗体系综合优化方案可使防渗墙与连接板之间止水缝沉陷变形分别减小41.5%和53.8%. 展开更多
关键词 深厚覆盖层 面板堆石坝 止水缝变形 优化设计
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250 m级特高面板堆石坝混凝土面板顺坡向应力控制措施研究
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作者 王芳 李国英 +1 位作者 米占宽 魏匡民 《三峡大学学报(自然科学版)》 CAS 北大核心 2024年第2期28-34,共7页
面板应力变形控制是建设250 m级特高混凝土面板堆石坝的关键难题.大量工程实测案例和研究计算表明,特高面板坝压应力常处于较高水平,对于坝轴向应力来说,采用柔性缝降低压应力措施已被工程界普遍接受,然而,目前对于如何降低面板顺坡向... 面板应力变形控制是建设250 m级特高混凝土面板堆石坝的关键难题.大量工程实测案例和研究计算表明,特高面板坝压应力常处于较高水平,对于坝轴向应力来说,采用柔性缝降低压应力措施已被工程界普遍接受,然而,目前对于如何降低面板顺坡向压应力尚缺少有效的解决方法.本文以拟建的240 m级GS面板坝为研究对象,从特殊增模区布置、面板施工顺序、面板低高程柔性横缝、高压力区高强度混凝土材料等4个方面提出改善面板顺坡向应力的工程措施.文中通过三维有限元精细模拟方法分析了提出的顺坡向应力改善措施的效果,文中提出的措施可为250 m面板堆石坝面板应力控制提供借鉴. 展开更多
关键词 特高面板堆石坝 结构应力 工程措施 有限元法
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堆石料本构模型对混凝土面板坝应力变形计算结果的影响研究
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作者 傅中志 张意江 +1 位作者 陈锦祎 王永生 《岩土工程学报》 EI CAS CSCD 北大核心 2024年第10期2089-2100,共12页
堆石料本构模型选择是影响混凝土面板坝应力变形计算结果的主要因素。以某典型面板坝为例,采用邓肯E-B非线性弹性模型和“南水”双屈服面弹塑性模型,对坝体填筑过程和蓄水过程进行了三维有限元模拟;研究了两种模型计算的坝体和面板的位... 堆石料本构模型选择是影响混凝土面板坝应力变形计算结果的主要因素。以某典型面板坝为例,采用邓肯E-B非线性弹性模型和“南水”双屈服面弹塑性模型,对坝体填筑过程和蓄水过程进行了三维有限元模拟;研究了两种模型计算的坝体和面板的位移和应力分布差异;分析了两种模型计算结果呈现差异的原因。两种模型计算结果最显著的差异体现在两个方面:(1)“南水”模型计算的坝体沉降、面板挠度等位移指标小于E-B模型,其原因是“南水”模型计算的坝体小主应力和变形模量更高。(2)E-B模型计算结果显示蓄水后面板底部顺坡向受拉;而“南水”模型计算的面板顺坡向应力为全断面受压。前者是由E-B模型的各向同性弹性本质决定的,垫层料因水压力作用顺坡向膨胀,产生沿坡面向上的位移;后者是其F1屈服面持续扩张产生塑性体积收缩导致的,塑性体缩抵消了顺坡向弹性膨胀,使垫层料产生沿坡面向下的位移。 展开更多
关键词 混凝土面板坝 堆石料 本构模型 应力变形
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高纬度高寒区面板堆石坝防渗面板修复方案及经验
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作者 吴俊杰 邓理想 《水利水电技术(中英文)》 北大核心 2024年第S01期44-50,共7页
JLBLK水电站大坝是建于高纬度高寒区的百米级全断面堆石面板坝,最大坝高140.3 m。通过降水处理,现场发现18^(#)、19^(#)面板挤压破损程度严重且有加剧趋势,25^(#)、26^(#)、27^(#)面板断裂。经与国内外同类工程比较,水库渗漏量总体偏大... JLBLK水电站大坝是建于高纬度高寒区的百米级全断面堆石面板坝,最大坝高140.3 m。通过降水处理,现场发现18^(#)、19^(#)面板挤压破损程度严重且有加剧趋势,25^(#)、26^(#)、27^(#)面板断裂。经与国内外同类工程比较,水库渗漏量总体偏大,变形量偏大,且尚未收敛,三维流变反演成果表明后期尚有17%的沉降量。为保证修复效果满足后期变形和渗透稳定需要,针对18^(#)、19^(#)面板水上破损区采用高于原设计强度混凝土分小区进行补强,并结合工程特点和设计方案提出适合本工程的修复施工方案,修复后面板各项指标均满足要求。 展开更多
关键词 面板堆石坝 挤压破损修复 坝体沉降变形 施工方案
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混凝土面板与堆石料接触面模型及其应用
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作者 傅中志 王立安 +1 位作者 陈锦祎 张意江 《岩土工程学报》 EI CAS CSCD 北大核心 2024年第11期2305-2313,共9页
混凝土面板是面板坝防渗安全的生命线,其应力变形特性主要取决于坝体堆石料的应力变形特性及面板与堆石料之间的接触特性。在面板坝的应力变形计算中,通常采用接触面模型模拟面板与堆石料之间的荷载传递机制,因此接触面模型是否合理,直... 混凝土面板是面板坝防渗安全的生命线,其应力变形特性主要取决于坝体堆石料的应力变形特性及面板与堆石料之间的接触特性。在面板坝的应力变形计算中,通常采用接触面模型模拟面板与堆石料之间的荷载传递机制,因此接触面模型是否合理,直接影响到面板应力变形计算结果的可靠性。分析了传统双曲线接触面模型存在的不足,提出了一个考虑双向剪切耦合效应,且符合强度准则和标架无差异原则的接触面本构模型,该模型参数少,数值实现方便,可以定性地模拟出实际面板坝工程中出现的混凝土挤压破坏区域。 展开更多
关键词 混凝土面板坝 接触面 本构模型 应力变形
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水循环荷载作用下高面板堆石坝长期变形特性研究 被引量:1
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作者 杨启贵 王艳丽 左永振 《岩土工程学报》 EI CAS CSCD 北大核心 2024年第6期1339-1346,共8页
高面板堆石坝的长期变形是面板坝建设中的关键技术问题之一,已有研究大多将长期变形归结为堆石体蠕变的结果,但某些高面板堆石坝的变形原型监测资料显示,仅从堆石体蠕变角度难以解释高面板堆石坝长期变形的机理。通过水布垭面板堆石坝17... 高面板堆石坝的长期变形是面板坝建设中的关键技术问题之一,已有研究大多将长期变形归结为堆石体蠕变的结果,但某些高面板堆石坝的变形原型监测资料显示,仅从堆石体蠕变角度难以解释高面板堆石坝长期变形的机理。通过水布垭面板堆石坝17a的变形监测资料分析和室内低频循环荷载作用下堆石料变形特性试验,探讨了实际运行中库水位周期性变化形成的循环荷载对高面板堆石坝长期变形特性的影响。结果表明:(1)坝体填筑和初次蓄水引起堆石体的瞬时变形和蠕变,堆石体的后期变形主要是水循环荷载长期作用的结果。(2)水循环荷载作用下,堆石体的变形表现为两种形式,其一为不可恢复的永久变形(亦称为残余变形),其二为可恢复的弹性变形。(3)室内低频循环荷载作用试验得到的堆石料变形及其增长规律很好地验证了水循环荷载与堆石坝后期变形的相互关系以及后期变形的力学意义。研究成果为高面板堆石坝长期变形特性研究提供了新的思路,并为具有往复大消落特点的高面板堆石坝变形及安全控制提供借鉴。 展开更多
关键词 水循环荷载 面板堆石坝 长期变形 实测资料 周期性小主应力 低频
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强震区抽蓄电站沥青混凝土面板堆石坝抗震稳定性分析 被引量:1
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作者 王栋良 唐杰 王辉 《水电能源科学》 北大核心 2024年第1期102-105,31,共5页
我国西北强震区某拟建抽水蓄能电站上水库采用沥青混凝土面板堆石坝,最大坝高161 m。为分析该坝抗震稳定性,在大坝非线性静力分析基础上,采用改进的等效粘弹性模型和有限元动力时程法等理论,对大坝开展三维有限元地震反应和坝坡抗震稳... 我国西北强震区某拟建抽水蓄能电站上水库采用沥青混凝土面板堆石坝,最大坝高161 m。为分析该坝抗震稳定性,在大坝非线性静力分析基础上,采用改进的等效粘弹性模型和有限元动力时程法等理论,对大坝开展三维有限元地震反应和坝坡抗震稳定性计算。结果表明,大坝在100年1%超越概率的校核地震(地震加速度为0.48g)作用下,坝体及面板的动力反应分布规律合理。其中,坝体顺河向、坝轴向、竖向加速度极值分别为13.93、13.91、13.80 m/s^(2)。考虑静动叠加后,在沥青混凝土面板反弧段的拉应变极值达0.95%,但小于改性沥青混凝土抗拉强度的一般允许值。因此,大坝即使遭遇0.48g的校核地震作用,亦能保持较好的整体安全性,不会出现重大抗震安全事故。 展开更多
关键词 校核地震 沥青混凝土面板堆石坝 动力反应 抗滑稳定 抽水蓄能电站
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Influence of soft rock-fill material as dam embankment with central bituminous concrete membrane
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作者 Peter TSCHERNUTTER 《Frontiers of Structural and Civil Engineering》 SCIE EI 2011年第1期63-70,共8页
This paper demonstrates the difficulties in determining the relevant material parameters for a valuation of the deformation behavior of the up-and downstream dam shell by means of an embankment dam of medium height.La... This paper demonstrates the difficulties in determining the relevant material parameters for a valuation of the deformation behavior of the up-and downstream dam shell by means of an embankment dam of medium height.Laboratory as well as field tests on solid rock-fill material were performed before the beginning of construction.During the construction the properties of the available rock-fill changed from solid to soft materials.This gave rise to the necessity of adjusting the dam design of the downstream dam shoulder.Several times higher dam settlements as well as significant differential settlements between the up-and downstream dam shell were observed during construction and operation.Apart from this situation,the dam has been operated for nearly 20 years and the behavior of the water barrier has been very good. 展开更多
关键词 embankment dam bituminous concrete membrane rock-fill material properties deformation behavior
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