考虑渗流作用的土坝地震反应分析
|
摘要
引入比奥固结理论采用流体-固体完全耦合的方法,考虑了孔隙水流动对坝体的孔隙水压力、应力及变形的影响,并用FLAC对土坝分别进行了耦合与非耦合数值模拟,对比结果表明考虑孔隙水流动时坝体水平变形量和竖向变形量都有所增大而孔隙水压力和有效应力的变化趋势取决于所在坝体的位置;对于地震时间较长,土层较薄,渗透系数较大的坝体需考虑孔隙水的流动。
Using the Biot consolidation theory and a fluid-solid complete coupling method,the influence of seepage on seismic response of earth dams is analyzed.Meanwhile,the influence of seepage on the pore water pressure,stress and deformation of the earth dams is considered.Simulation of the earth dams under fluid-solid coupling and non-coupling has been conducted by FLAC.The results show that the horizontal and vertical deformation components of the dams increase when the influence of seepage is considered,the change of pore water pressure and effective stress are determined by the dam location under consideration of seepage influence,and the seepage has to be considered for the dams with long seismic loading duration,thin soil layers and large permeability coefficient.
Using the Biot consolidation theory and a fluid-solid complete coupling method,the influence of seepage on seismic response of earth dams is analyzed.Meanwhile,the influence of seepage on the pore water pressure,stress and deformation of the earth dams is considered.Simulation of the earth dams under fluid-solid coupling and non-coupling has been conducted by FLAC.The results show that the horizontal and vertical deformation components of the dams increase when the influence of seepage is considered,the change of pore water pressure and effective stress are determined by the dam location under consideration of seepage influence,and the seepage has to be considered for the dams with long seismic loading duration,thin soil layers and large permeability coefficient.
引文
[1]徐志英,沈珠江.土坝地震孔隙水压力产生、扩散、消散的有限单元法动力分析[J].华东水利学院学报,1981,b(4):1-12.
[2]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008.
[3]Finn W D.State-of-the-art of geotechnical earthquake engineering practice[J].Soil Dynamics and Earthquake Engineering,2000,20(1):1-15.
[4]Martin G R,Finn W D,Seed HB.Fundamentals of liquefaction under cyclic loading[J].Journal of Geotechnical engineering division,ASCE,1975,101(5):423-438.
[5]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989.
[2]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008.
[3]Finn W D.State-of-the-art of geotechnical earthquake engineering practice[J].Soil Dynamics and Earthquake Engineering,2000,20(1):1-15.
[4]Martin G R,Finn W D,Seed HB.Fundamentals of liquefaction under cyclic loading[J].Journal of Geotechnical engineering division,ASCE,1975,101(5):423-438.
[5]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989.
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