粘土心墙土石坝震后破坏机理的二维有限元分析  

2-D FEM analysis of the post-earthquake failure mechanism for the earth-rock dam with clay core

作　　者：鞠花[1] 陈刚[2] 党发宁[2] 

机构地区：[1]西安理工大学理学院,陕西西安710048 [2]西安理工大学水利水电学院,陕西西安710048

出　　处：《水资源与水工程学报》2008年第4期6-9,共4页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金资助项目(50579085);国家自然科学基金重点项目(90510017)

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 varia- tion 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 con- solidation 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.

关 键 词：粘土心墙土石坝 震后 破坏机理 动力固结 有限元 

分 类 号：TV641.4[水利工程—水利水电工程]