The impact of water has a significant effect on the calculation of the side slope's safety coefficient based on the limit equilibrium method. The safety of the side slope is evaluated by analyzing the effective stress under the hydrostatic pressure condition, in which the full pore water pressure is taken into account in the earth pressure calculation, while under the hydrodynamic condition the total earth pressure is analyzed. No standard method is suggested in the current codes, but in many books related, a slight difference of the calculation results based on the two methods above-cited can be detected. According to the theory of the permeation fluid mechanics and soil mechanics, this paper analyzes the reasons of the calculation error based on the formulas suggested by current codes and its error level, a formula for the total earth pressure of side slope calculation under the seepage condition is also deduced in this paper, which has a pretty good consistency in the stability analysis of side slope under the hydrostatic condition and the seepage condition.%边坡稳定性极限平衡分析中水的作用对边坡安全系数计算结果影响很大.对于水的计算,静水压力下采用有效应力分析方法(水土分算)而动水压力条件下采用土条整体受力(水土合算)分析.当前各类规范中对动水压力计算没有一致规定,而相关书籍在计算中采用水土分算和水土合算对比时计算结果会有一定误差.根据渗流力学和土力学的基本原理,分析规范中公式计算的误差大小和产生原因,并推导出计算渗流边坡的水土合算公式,该公式在边坡静水压力状态稳定性计算和渗流状态稳定性计算中所得结果有很好的一致性.
展开▼
