降雨对层状软岩边坡的影响规律分析

采用摩根斯坦-普瑞斯法和有限差分法对层状软岩边坡在无水位和雨季水位2种状态下的稳定性进行分析评价,并以顺兴露天煤矿采场和排土场边坡为例进行了实例分析。结果表明:降雨对采场南帮边坡剖面D2的稳定系数折减幅度最大,达到了29.63%;对西帮D3剖面位置的弱化幅度最小,仅为0.14%。其主要原因在于南帮的暴露面积相对于其它边坡更大,在降雨影响下南帮边坡内部的水位线浸没了潜在滑面,增加了潜在滑面上部滑体的重力和水压力,造成边坡安全系数的急剧下降。采取削坡减重、内排压帮及疏干排水相结合的滑坡防治工程措施可有效的提高边坡稳定性,防止形成滑坡。

Analysis of the Influence Law of Rainfall on Layered Soft Rock Slope

The Morgan Stanley-Pryss method and the finite difference method are used to analyze and evaluate the stability of the layered soft rock slope under the two conditions of water-free and rainy season water level,and the slope of the stope and dump in Shunxing Open-pit Coal Mine.As an example,the results show that the stability of the D2 stability of the slope of the southern slope of the stope is the largest,reaching 29.63%;the weakening of the D3 section of the western slope is the smallest,only0.14%.The main reason is that the exposed area of the southern slope is larger than other slopes.Under the influence of rainfall,the water level line inside the southern slope is immersed in the potential slip surface,which increases the bulk density and water pressure of the sliding surface of the potential slip surface.The slope safety factor has dropped dramatically.The landslide prevention engineering measures combined with slope reduction,internal pressure relief and drainage and drainage can effectively improve the slope stability and prevent the formation of landslides.