粘土心墙土石坝震后破坏机理的二维有限元分析
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摘要
土石坝震后破坏机理研究是土石坝抗震研究中的关键问题之一。本文以新疆恰甫其海粘土心墙土石坝为例,利用二维三角形常应变动力固结有限元程序,分析了地震结束后粘土心墙土石坝坝体内部孔压场的时程变化规律及其对坝体稳定性的影响。研究表明,在粘土心墙土石坝震后固结过程中,受边界排水影响而产生的坝体内部孔压重分布以及孔压升高区域在坝体内部的迁移是导致粘土心墙土石坝发生震后破坏的根本原因。本文研究结果可以为高地震烈度区粘土心墙土石坝坝体断面的合理设计提供参考依据。
The study on post-earthquake failure mechanism of earth-rock filled dam with clay core is one of key problems of domestic and foreign seismic study on earth-rock filled dam.By taking Qiafuqihai Clay Core Dam in Xinjiang as a case study,based on the compiled finite element analysis program of 2-D triangle constant-strain element dynamic consolidation, the temporal variation of internal pore water pressure field of the dam and its influence on dam stability were studied in the paper.The results indicated that,during the process of post-earthquake dynamic consolidation of earth-rock filled dam with clay core,the re-distribution of dam internal pore water pressure caused by the drainage at the boundary of dam body and the migration of high pore water pressure zone in the dam body are main reasons of post-earthquake failure mechanism of earth-rock filled dam with clay core,which could provide important references for rational design for dam body cross section of earth-rock filled dam with clay core in high earthquake intensity region.
The study on post-earthquake failure mechanism of earth-rock filled dam with clay core is one of key problems of domestic and foreign seismic study on earth-rock filled dam.By taking Qiafuqihai Clay Core Dam in Xinjiang as a case study,based on the compiled finite element analysis program of 2-D triangle constant-strain element dynamic consolidation, the temporal variation of internal pore water pressure field of the dam and its influence on dam stability were studied in the paper.The results indicated that,during the process of post-earthquake dynamic consolidation of earth-rock filled dam with clay core,the re-distribution of dam internal pore water pressure caused by the drainage at the boundary of dam body and the migration of high pore water pressure zone in the dam body are main reasons of post-earthquake failure mechanism of earth-rock filled dam with clay core,which could provide important references for rational design for dam body cross section of earth-rock filled dam with clay core in high earthquake intensity region.
引文
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[13]朱俊高,俞炯奇,姜朴.松砂液化后液化区渐进扩散的计算方法初探[J].水利学报,1998,29(9):52-56.
[14]杨新宝,奚晓青.砂土液化判别的研究现状及存在问题[J].长春工程学院学报(自然科学版),2007,8(3):20-23.
[2]黄雨,八山鸟厚,氵尺田和秀,等.堤防地基地震液化的数值模拟[J].工程力学,2007,24(12):82-87.
[3]岑威钧,眭峰,顾淦臣.土质堤坝地震反应的简化有效应力计算方法[J].水力发电,2007,33(12):35-37.
[4]柳厚祥,廖雪,李宁,等.高尾矿坝的有效应力地震反应分析[J].振动与冲击,2008,27(1):65-70+72.
[5]李立云,杜修力.动载作用下饱和土壤液化的研究述评[J].世界地震工程,2006,22(2):39-49.
[6]徐斌,孔宪京,邹德高,等.砂砾料液化机理与孔压特性的试验研究[J].东南大学学报(自然科学版),2005,35,增刊(1):100-104.
[7]Gu W H,Morgenstern N R,Robertson P K.Progres-sive failure of Lower San Fernando Dam[J].J.ofGeotech.Engrg,1993,119(2):333-348.
[8]Gu W H,Morgenstern N R,Robertson P K.Postearthquake deformation analysis of Wildlife site[J].J.Geotech.Engrg,ASCE,1994,120(2):274-289.
[9]Castro G,Seed R B,Keller T Q et al.Steady-statestrength analysis of Lower San Fernando Dam[J].J.ofGeotech.Engrg,ASCE,1992,118(3):406-427.
[10]Ishihara K,Yasuds S,Yoshida Y.Liquefaction In-duced flow failure of embankments and residualstrength of silty sands[J].Soils and Foundations,1990,30(3):69-80.
[11]张克绪,谢军斐.土动力学[M].北京:地震出版社,1989.
[12]王媛,姜朴,朱俊高,等.松粉砂地基地震后堤坝稳定性分析[J].水利学报,2000,31(11):60-64.
[13]朱俊高,俞炯奇,姜朴.松砂液化后液化区渐进扩散的计算方法初探[J].水利学报,1998,29(9):52-56.
[14]杨新宝,奚晓青.砂土液化判别的研究现状及存在问题[J].长春工程学院学报(自然科学版),2007,8(3):20-23.
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