论文部分内容阅读
临坡河流水位、坡体裂隙水压和流水对边坡坡趾的淘蚀作用是引起临河路基边坡失稳的重要因素。基于极限平衡理论,推导了多影响因素条件下临河路基边坡抗滑稳定性安全系数的无量纲表达式,重点分析了临河水位条件、坡体内裂隙水压力和流水淘蚀作用对临河路基边坡稳定性的影响。算例分析表明:水位突降、坡顶张拉裂缝积水、裂隙渗流效应、滑面出流缝被堵塞、流水淘蚀作用不利于临河路基边坡抗滑稳定性;而边坡抗滑稳定性系数则随着临坡河流水位上升先减小后增大,高水位对提高边坡抗滑稳定性有积极作用,河流水位下降对边坡抗滑稳定性的影响则恰恰相反。以上因素也是导致山区临河路基在雨季发生失稳的重要原因。
The water erosion of slope slope water level, water pressure of slope fissure and flowing water on the slope toe are the important factors which cause the slope instability of Linhe subgrade slope. Based on the theory of limit equilibrium, the dimensionless expression of the safety factor of slope stability of Linhe subgrade under multiple influencing factors is deduced. The analysis of the condition of water level in Linhe River, the pressure of fissure water in the slope and the effect of water flow erosion on the slope of Linhe subgrade The impact of stability. The case study shows that: water level dip, crevasse water on crest, crevasse seepage effect and blockage of runoff in slip surface are blocked, and water erosion is not conducive to the stability of slope in Linhe subgrade; With the increase of the water level of the slope slope, the coefficient of the water first decreases and then increases. The high water level has a positive effect on the slope stability and the influence of the river water level drop on the slope stability is opposite. The above factors are also the main causes of instability of Linhe subgrade in mountainous area in rainy season.