摘要
本文针对降雨入渗深度对边坡稳定性影响的问题,从能量的角度推导土体最大入渗深度的理论公式,通过室内试验模拟不同降雨强度条件下土体入渗深度变化特征,基于有限元模拟软件模拟降雨入渗条件下边坡的渗流场演化规律与孔隙水压力的空间分布特征,并基于数值模拟结果拟合出降雨入渗深度与边坡安全系数的函数关系。研究结果表明:不同深度土体的能量梯度是雨水能够向下渗透的内在原因,降雨最大入渗深度与土体孔隙水压力有关,且随着降雨入渗深度的不断增加,边坡安全系数持续减少,二者呈二次函数关系。
In order to solve the problem of the influence of rainfall infiltration depth on slope stability,the theoretical formula of maximum infiltration depth of soil is derived from the point of view of energy.The variation characteristics of soil infiltration depth under different rainfall intensities are simulated by indoor test.The seepage field evolution law and pore water pressure are simulated by finite element simulation software.The results show that the energy gradient of soil at different depths is the internal reason why rain water can infiltrate downwards,and the maximum infiltration depth of rainfall is related to the pore water pressure of soil.With the increase of rainfall infiltration depth,the safety factor of slope decreases uniformly,and there is a linear relationship between them.
出处
《福建建设科技》
2019年第6期57-60,共4页
Fujian Construction Science & Technology
关键词
边坡降雨
入渗深度
非饱和土
室内试验
Slope rainfall
infiltration depth
unsaturated soil
laboratory test
