重力坝深层抗滑稳定分析中扬压力施加方法  

Method of Applying Uplift Pressure in the Analysis of Deep Sliding Stability of Gravity dam

作　　者：黄耀英[1] 沈振中[2] 郑宏[3,4] 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]河海大学水利水电学院,南京210024 [3]中国科学院武汉岩土力学研究所,武汉430071 [4]中国科学院岩土力学与工程国家重点实验室,武汉430071

出　　处：《长江科学院院报》2013年第12期112-117,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51209124);湖北省教育厅科学技术项目(D20101207)

摘　　要：针对采用有限单元法对扬压力进行计算时,常容易发生疑惑而导致错误的问题,首先对比分析了双斜面深层抗滑稳定分析时2种不同扬压力的作用方式,然后研究了采用有限元法分析重力坝沿坝基面或深层双斜面抗滑稳定时扬压力的施加方式。分析认为:扬压力作为面荷载作用在滑面上,或作为体荷载作用在滑块上,虽然总的作用力近似相等,但由于滑块为变形体,不一定引起相近的效应量(位移和应力等);其中,在垂直方向分别按面荷载或体荷载作用引起的差异,相对于在水平方向分别按面荷载或体荷载作用引起的差异来说,前者引起的差异较后者引起的差异大一些。Finite element method often brings about errors in the calculation of uplift pressure. In view of this, two action modes of uplift pressure in the analysis of the deep sliding stability of double inclined planes were compared and analyzed. Then the methods of applying uplift pressure when analyzing the sliding stability of double inclined planes and gravity dam＇ s foundation planes using finite element method were researched. It＇ s found that uplift pressure, as surface load acting on the slip surface or as body load acting on the sliding block, though with approxi- mately equal total force, doesn＇t necessarily cause similar effect quantity （displacement and stress, etc） because sliding block is the deformation body. The difference caused by applying surface load or body load in the vertical direction is larger than that in the horizontal direction.

关 键 词：扬压力 重力坝 有限元法 坝基面 双斜面 

分 类 号：TV64[水利工程—水利水电工程]