降雨作用下煤系地层高速公路路堑边坡滑坡成因及稳定性研究

Study onlandslide formation and stability of cutting slope of expressway in coal measure strata under the action of rainfall

为研究降雨对煤系地层路堑边坡稳定性影响,以晴兴高速K16滑坡为例,通过工程地质调绘、钻探等手段查明滑坡基本特征,采用数值模拟计算分析,研究降雨入渗对滑坡作用机理及稳定性影响。结果显示,降雨入渗是引发滑坡失稳的关键诱因,滑坡前、后缘的孔隙水压力随降雨持续而增大,整体呈“S”形,滑坡中部受地形、地质条件影响,孔隙水压力呈缓慢增长趋势;滑坡稳定型系数随降雨持时的增加而不断降低,并在后期呈现快速下降趋势。

In order to study the influence of rainfall on the stability of cutting slope in coal measure strata,K16 landslide of Qingxing expressway is taken as an example,through engineering geological mapping,drilling and other means to identify the basic characteristics of the landslide,using numerical simulation calculation and analysis,to study the effect of rainfall infiltration on the mechanism and stability of the landslide.The results show that rainfall infiltration is the key inducement of landslide instability,the pore water pressure at the front and back edge of landslide increases continuously with rainfall,which is S-shaped as a whole,the pore water pressure in the middle part of landslide increases slowly under the influence of topography and geological conditions.The stability coefficient of landslide decreases continuously with the increase of rainfall,and decreases rapidly in the later period.