地下连续墙局部与整体稳定性分析

Local and Overall Stability Analysis for Slurry Trench

连续墙的稳定性问题在实际工程中是比较重要的工程问题。在分析了连续墙可能的破坏形式后,提出连续墙的局部与整体破坏模式。利用极限分析上限定理,构建摩尔-库伦土体中两种破坏模式的速度机动场,并求得了相应的外力功率与内部能量耗散,利用内外功率相等,将稳定性问题转化为非线性规划问题,并提出了相应的约束条件。利用优化算法,求得了局部破坏的稳定系数与整体破坏的安全系数,并分析了连续墙的稳定性随强度参数的变化规律。

The stability of slurry trench is a quite important problem in engineering practice.The possible failure model of slurry trench was analyzed and the local and overall models were proposed.Applied the upper bound theorem,the kinematically admissible velocity field for two failure model was constructed,and the external forces power and internal energy disputation was obtained.Based on the equality for external and internal power,the stability problem can translated to non-linear programming problem,and the constraint condition was presented.By optimization method,the stability factor of local failure and safety factor of overall failure were obtained.The variation of slurry trench stability with the strength parameter was analyzed.