强降雨条件下土质边坡瞬态稳定性分析

基于实际降雨气象资料，设计了单峰降雨和8个不同时间间隔的双峰降雨计算方案，利用非饱和土力学理论，对边坡的瞬态稳定性进行了计算和分析，研究了水分在坡体内的运移对边坡稳定性的时间空间影响效应，同时考察了降雨入渗造成的土性渗透特性的改变。分析发现：一次降雨的影响历时约12 d，降雨后约0.5 d该类土质边坡最危险；不同时间间隔的两次降雨对边坡稳定的影响比单峰降雨的最小安全系数滞后约0.3 d～0.8 d，影响历时基本保持不变；土体物理力学性质、边坡最危险滑动面及其对应的安全系数随水分在坡体内渗透运移而变化。

Analysis of soil slope's transient stability under intensive rainfall

Utilizing actual rainfall data, transient stability of soil slope is computed and analyzed under condition of one peak of rainfall and 8 different kinds of two peak rainfall schemes at different time intervals according to theory of unsaturated soil mechanics. Moreover, the effect of time and space about stability of slope is explored under the infiltration of rainfall into the slope body. In addition, soil hydraulic property changed by rainfall is presented too. It is found that the time effected once by rainfall is about 12 day, the minimum of safety factor appears after 0.5 day of rainfall, that the most dangerous situations of the soil slope effected by different interval time of twice rainfall happen 0.3-0.8 day later than that of once rainfall, the lasting time effected by rainfall being kept, and that the physical and mechanics characteristics of the soil, the most dangerous slip surface of the slope and its relative safety factor is effected and vibrated with water motion in different parts of the slope.