降雨强度对边坡稳定性影响的数值模拟研究

Numerical Simulation Study on Slope Stability During Rainfall Intensity

影响边坡稳定性的因素很多,利用数值模拟分析方法研究了降雨历时、降雨强度对边坡稳定性的影响。模拟结果表明,在相同坡角、相同降雨时间时,降雨强度越大,安全系数下降越快,土中孔隙水压力变化越快,土体位移变化越大,边坡稳定性降低越快;降雨强度大的边坡滑动要先于降雨强度小的边坡,降雨强度越大土体越先达到稳定状态,降雨强度大的边坡的入渗深度总是大于降雨强度小的边坡的入渗深度,降雨强度大的边坡安全系数始终低于降雨强度小的边坡的安全系数。

In this paper,there are two factors,intensity of rainfall and duration of rainfall,which affect the stability of slope were studied based on numerical simulation.The results show that under the same slope of the thickness,the same rainfall time,the greater rainfall intensity,the faster the safety factor decline,the greater change in soil pore water pressure,the greater change of displacement of soil.Finally,the displacement of soil will enhance,the stability of slope will decrease;The slope of big rainfall intensity slides before the slope of small rainfall intensity,the greater the rainfall intensity is,the faster the stable state of the slope gets.The infiltration depth of the slope of big rainfall intensity is always greater than the infiltration depth of the slope of small rainfall intensity,the safety factor of the slope of big rainfall intensity is always lower than the safety factor of the slope of small rainfall intensity.