考虑降雨作用的含张拉裂隙顺层岩坡稳定性分析

顺层岩质边坡的稳定性主要取决于软弱层面的性质和地下水对层面的水压力。而目前软弱层面的入渗渐进弱化作用对岩质边坡稳定性影响的分析方法仍不完善。探讨了张裂隙水对软弱夹层面的入渗渐进弱化模式,并结合水力作用给出了入渗作用下岩质边坡稳定性系数和临界降雨强度的表达式。研究结果表明:弱化作用和静水压力对边坡稳定性的影响均与后缘裂隙水位高度(h)和阶段表征值(λL)有关,其稳定性系数随后缘裂隙水位高度和阶段表征值的增加而减小;后缘裂隙临界水位高度和临界降雨强度并不是固定值,而是与边坡所处的入渗阶段有关。

Stability analysis of bedding rock slope with tensile fracture under rainfall condition

The stability of bedding rock slope mainly depends on properties of weak interlayers and groundwater pressure. At present, the study on influence of infiltration weakening on the weak bedding surface of rock slope is still not perfect. In this paper, the gradual infiltration weakening mode of tensile fracture water into the bedding surface is discussed, and the expressions of the rock slope stability and the critical rainfall intensity under rainfall infiltration are derived. The results show that weakening effect and hydrostatic pressure influences on slope stability are related with rear frontier water head and phase characterization value λL, namely the stability decreases with the rise of the water head and stage characterization value. The critical water level in the tension crack and the critical rainfall intensity are not fixed, but they closely relate to the infiltration stage of the slope.