不同雨型循环作用下边坡渗流场及稳定性分析

Seepage Field and Stability Analysis of Slope under Different Rain Type Circulation

降雨是影响边坡稳定性的最主要因素之一。以江西省信江八字嘴航电枢纽项目为工程依托,基于饱和-非饱和渗流理论,针对以往研究较少关注的不同雨型下边坡渗流及稳定性变化,采用Geo-studio模拟均匀、后峰、骤缓、循环降雨等工况,通过SLOPE/W和SEEP/W模块分析不同雨型下的边坡渗流场及安全系数演变规律。计算结果表明:不同雨型对该边坡稳定性影响排序为:骤缓型<后峰型<中峰型<前峰型<均匀型;降雨入渗条件下,循环后峰、循环均匀的孔压变化滞后性强于其他雨型,距坡表越远处孔压变化滞后性越强;相同循环条件下不同周期内各雨型对边坡的影响均存在差异且各周期差异不同。

Rainfall is one of the most important factors affecting slope stability.Based on the Bizui Avionics Hub project in Xinjiang,Jiangxi Province,and based on the saturation-unsaturated seepage theory,Geo-studio was adopted to simulate the seepage and stability changes of slope under different rain patterns,which were less concerned by previous studies.SLOPE/W and SEEP/W modules were used to analyze the seepage field and safety factor evolution of slope under different rain patterns.The calculation results show that the effects of different rain patterns on the stability of the slope are as follows:sudden type<post peak type<middle peak type<front peak type<uniform type.Under the condition of rainfall infiltration,the lag of pore pressure change after the cycle peak and uniform circulation is stronger than that of other rain patterns,and the longer the distance from the slope surface,the stronger the lag of pore pressure change.Under the same cycle conditions,the influence of each rain pattern on the slope in different periods is different and the difference in each period is different.