心墙堆石坝应力状态对渗流场影响的有限元分析  

Finite element analysis of influence of stress state on seepage field of core-wall rockfill dams

作　　者：邹玉华[1] 陈群[1] 谷宏海[1] 

机构地区：[1]四川大学水利水电学院水力学与山区河流开发保护国家重点实验室,成都610065

出　　处：《岩土力学》2011年第7期2177-2183,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50709022);2007年新世纪优秀人才支持计划(No.NCET-07-0569)

摘　　要：一般对土石坝进行渗流分析时都未考虑坝体的应力场对渗流场的影响。然而,在土石坝的蓄水过程中,坝体内的应力状态复杂且变化大,对渗流场的影响也较大。因此,忽略应力场对渗流场的影响必然造成一定的误差。用有限元方法对心墙堆石坝体蓄水过程中考虑和不考虑应力场影响的渗流场进行对比分析,计算结果表明,渗流-应力耦合作用下坝体局部压密变形,渗透流速减小,心墙下游出逸区域的水力坡降峰值明显高于非耦合值。因此,渗流分析时有必要考虑应力场的影响,否则会得出偏于危险且对工程不利的结果。Generally, the influence of the stress state on the seepage field was not considered in the seepage analysis for the embankment dams. However, the stresses in the embankment dams are very complex and have large variation during water filling. Furthermore, the stress state has evident impact on the seepage field. So some errors will be induced into the seepage analysis results if the influence of the stress is ignored. The seepage fields of the core wall rockflll dams on the conditions of considering or not considering the influence of the stress are analyzed and compared using the finite element method. The results show that induced by the stresses on the dams, local compressive deformation of the dams occurred, the seepage velocity of the dams decreases and the maximum hydraulic gradients at the seepage exit is much larger than those in the non-coupling analyses; it is shown that the seepage analysis without considering the effects of stress on the dam seepage is not conducive to dam safety.

关 键 词：堆石坝 渗流场 应力状态 渗流-应力耦合 有限元 

分 类 号：O35[理学—流体力学]