考虑渗透系数各向异性的降雨入渗岩质边坡稳定性分析

Stability Analysis of Rainfall Infiltration Rock Slope Considered from Anisotropy of Permeability Coefficient

降雨往往会抬高地下水位,是引发边坡失稳的重要因素,因此合理确定地下水位对于分析边坡稳定性有着重要意义.对于裂隙岩体边坡而言,降雨入渗主要沿着岩体内部的裂隙网络进行.基于统计岩体力学理论,利用各向异性的渗透系数对传统的浸润线方程进行修正,结合垂向入渗和横向渗流两方面探讨了降雨转化为地下水位的过程以及渗透系数起到的作用.在此基础上,采用C#语言编写了裂隙岩体边坡稳定性计算模块,以山口岩大坝右岸一处岩体边坡为例,验证修正后浸润线方程计算结果的合理性以及自主开发计算模块的实用性.为降雨入渗条件下,裂隙岩体边坡稳定性研究提供一种新的思路.

That rainfall tends to raise the groundwater level is an important factor causing the slope instability.Therefore,it is vital to rationally determine the groundwater level for the analysis of slope stability.As for the fractured rock slope,the rainfall infiltration basically takes place along the fissure network inside the rock mass.Based on the theory of statistical mechanics of rock mass,using the anisotropic permeability coefficient to modify the traditional phreatic line equation,and combining the vertical infiltration and transverse seepage,the present paper discusses the process of the rainfall transforming into the groundwater level and the effect of the permeability coefficient.On this basis,the calculation module of slope stability is written in C#language.Finally,taking a rock slope on the right bank of the Shankouyan Dam as an example,the rationality of the correction of the saturation line and the applicability of the stability calculation procedure are proved,which provides a new idea for the hydraulic study of the stability of fractured rock mass slope under the condition of rainfall infiltration.