非饱和土边坡稳定分析中强度折减法与条分法的比较

Comparison analyses on stability of unsaturated soil slopes by strength reduction FEM and slice method

【目的】对比分析不同基质吸力分布条件下,Bishop条分法和强度折减有限元法计算结果的异同。【方法】在考虑非饱和基质吸力条件下,基于Bishop条分法和强度折减有限元法的计算原理和实现方法,开发了可考虑基质吸力的Bishop条分法和强度折减有限元法的相关程序,并且针对某边坡工程进行了计算分析。【结果】在基质吸力逐步减弱直至丧失的过程中,2种方法均在一定程度上反映了非饱和土边坡安全系数降低的现象,但二者确定的安全系数大小有一定差异,且二者确定的潜在滑动面形状和位置差异较大。【结论】相比而言,在较复杂基质吸力分布条件下,强度折减有限元法适用性较好、计算结果较合理,有较大的发展前景。

【Objective】 The characteristic and difference of the results of the slice method and strength reduction FEM are compared under the cases of different distributions of matric suction.【Method】 Based on discussion of the computational principle and method of Bishop s slice method and the strength reduction FEM,the program codes of the slice method and strength reduction FEM which can consider matric suction are developed individually.【Result】 The results show that the slope safety factor reduces to some extent...