深覆盖层上面板堆石坝防渗墙应力变形分析
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
采用三维非线性有限元方法分析深覆盖层上面板堆石坝防渗墙应力变形特性,覆盖层和坝体材料的本构关系采用邓肯-张E-B模型,在防渗墙和覆盖层之间设置接触摩擦单元以模拟两者之间的相互作用。通过建立的有限元模型分析了坝体分期筑坝、坝体填筑速度以及防渗墙施工顺序对墙体应力变形特性的影响,同时探讨悬挂式防渗墙的应力变形特性。计算结果表明:坝体分期填筑对防渗墙的应力变形特性影响较小;较快的施工速度将引起坝体竣工期防渗墙较大的应力变形,其中拉应力达到3 MPa,顺河向变形达到15 cm;防渗墙靠后的施工顺序可以使运行期防渗墙拉应力减小2.42 MPa,顺河向变形减小达85%;悬挂式防渗墙贯入深度越小,其应力变形特性越趋于安全稳定。
Three-dimensional finite element method is used to analyze the stress and deformation behavior of cut-off wall of concrete faced rockfill dam on deep overburden foundation. The Duncan-Chang E-B model is used to simulate the constitutive relationship between rockfill and overburden material. The contact friction elements are set to simulate the interaction between the concrete structures and the overburden and cushion materials. The influences of staged-filling scheme,construction rate of dam body and construction sequence on stress-deformation behavior of the cut-off wall are discussed. In addition,the stress-deformation behavior of the suspended cut-off wall is also analyzed. Based on the numerical analysis,it is concluded that the staged-filling of dam body has small impact on the stress and deformation of the cut-off wall,whereas high construction rate may cause large stresses and displacements of the wall during completion period( tensile stress reaches 3MPa,deformation along the river direction amounts to15cm),and the sequence of constructing cut-off wall in later stage could reduce the tensile stress by 2. 42 MPa and the deformation along river direction by 85%. A small depth of suspended cut-off wall could also improve its stress and deformation behavior.
引文
[1]LI K F,JU Y W,HAN J G,et al.Early-age Stress Analysis of a Concrete Diaphragm Wall through Tensile Creep Modeling[J].Materials and Structures,2009,42(7):923-935.
    [2]孙大伟,邓海峰,田斌,等.大河水电站深覆盖层上面板堆石坝变形和应力性状分析[J].岩土工程学报,2008,30(3):434-439.(SUN Da-wei,DENG Hai-feng,TIAN Bin,et al.Deformation and Stress Analysis of Dahe CFRD Built on Thick Alluvium Deposits[J].Chinese Journal of Geotechnical Engineering,2008,30(3):434-439.(in Chinese))
    [3]温续余,徐泽平,邵宇,等.深覆盖层上面板堆石坝的防渗结构形式及其应力变形特性[J].水利学报,2007,38(2):211-216.(WEN Xu-yu,XU Ze-ping,SHAO Yu,et al.Study on Seepage Blocking Structure in CFRD Built on Deep Alluvium Foundation[J].Journal of Hydraulic Engineering,2007,38(2):211-216.(in Chinese))
    [4]沈婷,李国英,李云,等.覆盖层上面板堆石坝趾板与基础的连接方式研究[J].岩石力学与工程学报,2005,24(14):2588-2592.(SHEN Ting,LI Guoying,LI Yun,et al.Numerical Analysis of Joint Types between Toe Slab and Foundation of CFRD in Alluvial Deposit Layer[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(14):2588-2592.(in Chinese))
    [5]周小溪,何蕴龙,熊堃,等.深厚覆盖层坝基防渗墙地震反应规律研究[J].长江科学院院报,2013,30(4):91-97.(ZHOU Xiao-xi,HE Yun-long,XIONG Kun,et al.Features of Seismic Response of Cutoff Wall in Dam Foundation with Deep Overburden[J].Journal of Yangtze River Scientific Research Institute,2013,30(4):91-97.(in Chinese))
    [6]丁艳辉,张其光,张丙印.高心墙堆石坝防渗墙应力变形特性有限元分析[J].水力发电学报,2013,32(3):162-167.(DING Yan-hui,ZHANG Qi-guang,ZHANG Bing-yin.FEM Analysis of Stress-deformation Characteristics of Cut-off Walls in High Core Rockfill Dam[J].Journal of Hydroelectric Engineering,2013,32(3):162-167.(in Chinese))
    [7]郦能惠,米占宽,孙大伟.深覆盖层上面板堆石坝防渗墙应力变形性状影响因素的研究[J].岩土工程学报,2007,29(1):26-31.(LI Neng-hui,MI Zhankuan,SUN Da-wei.Study on Affecting Factors of StressDeformation of Diaphragm Walls for Concrete Face Rockfill Dams Built on Thick Alluvium Deposit[J].Chinese Journal of Geotechnical Engineering,2007,29(1):26-31.(in Chinese))
    [8]郦能惠,孙大伟,米占宽.深覆盖层上面板堆石坝的圆弧型防渗墙[J].岩土力学,2006,27(10):1653-1657.(LI Neng-hui,SUN Da-wei,MI Zhan-kuan.Arc Type Diaphragm Wall for Concrete Face Rockfill Dam Built on Deep Alluvium Deposit[J].Rock and Soil Mechanics,2006,27(10):1653-1657.(in Chinese))
    [9]熊欢,王清友,高希章,等.沙湾水电站一期围堰塑性混凝土防渗墙应力变形分析[J].水力发电学报,2010,29(2):197-203.(XIONG Huan,WANG Qing-you,GAO Xi-zhang,et al.Stress Deformation Analysis of Plastic Concrete Cutoff Wall for the First Stage Cofferdam of Shawan Hydropower Station[J].Journal of Hydroelectric Engineering,2010,29(2):197-203.(in Chinese))
    [10]吴梦喜,余学明,叶发明.高心墙堆石坝坝基防渗墙与心墙连接方案研究[J].长江科学院院报,2010,27(9):59-64.(WU Meng-xi,YU Xue-ming,YE Faming.Research on Conjoining Scheme for Anti-seepage Wall of High Rockfill Dam with Earth Rock[J].Journal of Yangtze River Scientific Research Institute,2010,27(9):59-64.(in Chinese))
    [11]RICE J D,DUNCAN J M.Finding of Case Histories on the Long-term Performance of Seepage Barriers in Dams[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(1):2-15.
    [12]RICE J D,DUNCAN J M.Deformation and Cracking of Seepage Barriers in Dam Due to Changes in the Pore Pressure Regime[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(1):16-25.
    [13]潘迎,何蕴龙,周小溪,等.河谷地形对深覆盖层中防渗墙应力变形影响分析[J].岩土力学,2013,34(7):2023-2030.(PAN Ying,HE Yun-long,ZHOU Xiao-xi,et al.Analysis of Effect of Canyon Terrain on Stress and Displacement of Cutoff Wall in Dam Foundation with Deep Overburden[J].Rock and Soil Mechanics,2013,34(7):2023-2030.(in Chinese))
    [14]谢兴华,王国庆.深厚覆盖层坝基防渗墙深度研究[J].岩土力学,2009,30(9):2708-2712.(XIE Xing-hua,WANG Guo-qing.A Study of Anti-seepage Wall Depth in Thick Overburden Dam Base[J].Rock and Soil Mechanics,2009,30(9):2708-2712.(in Chinese))
    [15]黄梅琼,柴军瑞,白勇,等.深覆盖层坝地基防渗措施对渗流场影响数值分析[J].长江科学院院报,2009,26(10):126-128.(HUANG Mei-qiong,CHAI Jun-rui,BAI Yong,et al.Numerical Analysis for Influence of Anti-seepage Measure of Deep Overburden Foundation Seepage Field[J].Journal of Yangtze River Scientific Research Institute,2009,26(10):126-128.(in Chinese))

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心