黄土边坡降雨入渗规律及其对稳定性的影响  

Loess Slope Rainfall Influent Seepage Pattern and Its Impact on Slope Stability

作　　者：汪勇[1] 刘瑾[1] 张建忙 Wang Yong Liu Jin Zhang Jianmang(School of Earth Science and Engineering, Hohai University, Nanjing, Jiangsu 210098)

机构地区：[1]河海大学地球科学与工程学院,南京210098

出　　处：《中国煤炭地质》2017年第1期48-52,共5页Coal Geology of China

摘　　要：降雨是诱发土质边坡失稳的主导因素之一,研究降雨入渗对土质边坡稳定性的影响有着重要意义。以陕西富平地区某黄土边坡为例,结合野外现场试验和数值模拟,研究了降雨入渗规律和其对稳定性的影响。研究结果表明,降雨入渗的影响范围在边坡浅层,深度为2~2.5 m。土体的抗剪强度参数受含水率影响较大,在雨水入渗条件下,边坡表层的孔隙水压力变化较大,孔隙水压力的变化区域指示着湿润锋的位置。最大剪应力的应力集中区域为湿润锋区域以及各级边坡坡脚处,降雨后边坡稳定性系数比降雨前降低了12%,显示降雨对边坡的稳定性影响较大。Rainfall is one of leading factors to induce soil slope instability. Study of impact on soil slope stability from rainfall influent seepage has great significance. Taking a loess slope in Fuping area, Shaanxi as example, combined with field site tests and numerical simulation, studied rainfall influent seepage pattern and its impact on slope stability. The result has shown that the impacting extent is confined within slope superficial zone with depth 2~2.5m. Soil mass shear resistance parameters are largely impacted by specific moisture content. Under the rainfall influent seepage, slope superficial zone pore water pressure varied largely, pore water pressure variation domain indicating wetting front position. Maximum shear stress concentration regions are wetting front region and toes of slope at all levels. Slope stability coefficient after rainfall has 12% less than before rainfall, indicated larger impact on slope stability from rainfall.

关 键 词：降雨入渗 黄土边坡 人工降雨 数值分析 稳定性 

分 类 号：P642.22[天文地球—工程地质学]