重力坝抗滑稳定分析中DDA与有限元方法的比较

Comparison of stability of gravity dams by Discontinuous Deformation Analysis and Finite Element Method

本文在原来的DDA基础上作了扩展 ,推导了水压、扬压力等荷载矩阵以及抗滑稳定局部、整体安全系数的求解方法并编制了相应的程序。由本文给出的计算实例可以看出 ,经扩展的DDA法可以较高精度求出沿各可能滑裂面的安全系数 。

In this paper, an extension version of DDA is presented. The extension includes:i) DDA's loading vector computation of the water pressure and the lift pressure; ii) a code of local and global coefficients of factor safety against sliding calculation. By the extended methods of DDA, the stability of gravity dam along any possible sliding plane can be calculated. By the calculation results of an example, a new method for determining both the local and global coefficients of factor safety for the stability of gravity dam is presented in this paper.