考虑节理岩体强度各向异性的最危险滑动面搜索

Most dangerous sliding surface search of dam foundation considering strength anisotropy of jointed rock mass

针对实际岩体中节理裂隙的分布特征,为了找准岩体破坏性滑动面的位置,在考虑节理岩体强度各向异性的基础上,提出了重力坝坝基滑动面自动搜索算法,并基于ABAQUS和FORTRAN平台,开发了针对有限元分析结果的重力坝坝基滑动面自动搜索程序。该程序由有限元结果导入、滑动面搜索2个模块组成。采用该算法,对坝基基岩中含有不同节理裂隙分布特征的重力坝在地震动荷载作用下的深层滑动面进行了实例验证。结果显示,该搜索方法得到的滑动面同有限元法得到的屈服区相吻合,证实了该滑动面搜索程序的可行性和可用性。

In order to search for the exact destructive sliding surface,the automatic search algorithm for sliding surface,which considers characteristics of the anisotropic strength of jointed rock mass is proposed.And the program of automatic search for sliding surface based on post processing for finite element analysis is developed by utilizing the software of ABAQUS and FORTRAN.The program include two parts,part one is the introduction of finite element model information and the analysis results and part two is the automatic searching procedure for sliding surface.We apply it to a gravity dam with different foundation joint distribution under different earthquake intensities.The results show that the sliding surface obtained by the program is almost the same as the yield zone searched by FEM analysis,which proves that the program is feasible and available.