考虑地下水作用的连续墙开挖稳定分析

地下连续墙在开挖的过程中容易发生失稳破坏,因此其稳定性分析是重要的工作.分析了地下连续墙的局部与整体破坏模式,并考虑开挖时的地下水作用.利用极限分析上限定理,构建运动许可的速度机动场.利用积分,求得了地下水的外力功率,结合土体重力功率与内能耗散,得到了稳定性问题的数学表达式.在该问题的几何约束条件下,利用优化算法,求得了地下连续墙局部破坏的稳定系数与整体破坏的安全系数.最后讨论了地下水高度对连续墙稳定性的影响.

Local and Overall Stability Analysis for Slurry Trench

For the probable failure of slurry trench in excavation process,the stability analysis is very important work for the design and construction.The local and overall failure models of slurry trench were proposed,and the influence of groundwater was also considered.Applying upper bound theorem,the kinematically admissible velocity field was established.The external forces work rate of hydrostatic pressure was obtained by integration.With the soil gravity work rate and internal energy,the formulation of slurry trench stability was obtained.Under the constraint condition,the stability factor of local failure and safety factor of overall failure were optimized.The influence of underground water on the stability was also discussed.