关于坝基深层抗滑稳定刚体极限平衡法的改进  

Improved rigid body limit equilibrium method for analysis of dam foundation stability against deep sliding

作　　者：陈际唐 游万敏 

机构地区：[1]长江勘测规划设计研究院,湖北武汉430010

出　　处：《水利学报》2011年第8期963-969,共7页Journal of Hydraulic Engineering

摘　　要：针对常见的坝基深层抗滑稳定刚体极限平衡分析方法存在的问题(第三滑面假定为铅直面、该面上反力方向角计算时需作假定)作了改进,提出了三K法,其使第三滑面可为倾斜面,并在该面上也建立力的平衡方程式,对三个滑面建立三个方程式,用迭代法解算可求得安全系数最小的K值及其滑移模式(第二、三滑面的方向角)。通过多个算例计算分析,本文方法与FLAC法、有限元法的计算结果十分接近。因此,在进行坝基刚体极限平衡分析时,可以本文提出的三K法取代等K法,使坝基深层抗滑稳定设计计算更为安全、合理。There are some problems in analysis of dam foundation stability against deep sliding by normal rigid body limit equilibrium method, such as the third sliding surface is assumed vertical and the direction angle of reaction is needed to make assumptions. To solve these problems, the method should be improved. In this paper, the third sliding surface may be a inclined plane, on which the force balance equation can also be established. The establishment of equations for three sliding surfaces, and solution by iteration meth- od can find the smallest K value and the sliding mode （the direction angles of the second and the third sliding surfaces）. The analyses of several examples verify that the calculation results are very close to those results obtained from FLAC and FEM. Therefore, in the rigid body limit equilibrium analysis of dam foundation stability against deep sliding the current used Equal-K Method should be replaced by the proposed Three-K Method.

关 键 词：重力坝 深层抗滑稳定 等K法 三K法 

分 类 号：TV642.3[水利工程—水利水电工程]