泄流雨雾条件下岩质边坡稳定性的耦合分析

Coupling Analysis of the Stability of Rocky Slope under the Condition of Flood and Fog Discharge

研究了岩质边坡稳定性与渗流的关系,基于质量守恒定律和微积分方程推导出了饱和-非饱和渗流关系式。以某工程实例边坡为基础,将饱和-非饱和渗流与应力场耦合建立等效连续介质模型,进行耦合计算。通过Geo-Studio软件模拟泄洪雨雾入渗过程,详细分析泄流雨雾条件下岩质边坡的渗流场变化、位移场变化及边坡的稳定性。计算结果表明,随着泄流雨雾的进行会出现暂态饱和区,压力水头逐渐增高,岩质高边坡的稳定安全系数显著降低。研究能够为水电站工程施工前期评价其安全性提供一定科学依据。

This paper studied the relationship between rocky slope stability and seepage,and deduced the relation between saturated and unsaturated seepage based on the law of mass conservation and the equation of calculus.Taking the slope of an engineering as an example,the equivalent continuous media model was established by coupling the saturated-unsaturated seepage with the stress field for coupling calculation.Geo-Studio software was used to simulate the infiltration process of flood and fog discharge,which analyzed in detail the seepage field change,displacement field change and slope stability of rocky slope under the condition of flood and fog discharge.The calculation results show that the transient saturation zone will appear with the discharge of flood and fog,the pressure water head will increase gradually,and the stability and safety coefficient of the high rocky slope will decrease significantly.This provides a scientific basis for evaluating the safety of hydropower station in the early stage of construction.