基于三角条块法的土体主、被动临界滑动场及土压力的计算

提出基于三角条块法的土体主、被动临界滑动场的数值模拟方法,并得到相应的土压力分布。首先,将土体划分为若干三角条块,引入带参数的条间力函数,建立土体极限平衡方程;然后,由最优控制理论得到一系列互不相交的临界滑动面,选定通过墙脚的临界滑动面,根据平衡方程求解格式,不断调整条间力函数中的参数,使土体满足力与力矩的平衡;最后,利用有限差分法,由墙面上各离散点的临界推力计算墙面上的土压力分布。数值计算结果表明,此方法适应性强,可计算任意倾斜角度的填土和墙体,且精度高、与现有解析解一致,可用于工程计算。

Computation of Active and Passive Critical Slip Field of Soil and Earth Pressure Based on Triangular Slices

By extending and modifying the method of critical slip field,a new numerical procedure based on triangular slices is proposed for constructing active and passive slip field behind retaining structures,resulting in the distribution of active and passive earth pressure.First,the soil mass is divided into a series of triangular slices,the limit equilibrium equations are established with introduced inter-slice force function.Then a series of critical slip surfaces,which do not intersect each other,are obtained ...