裂隙损伤岩体在渗流作用下的边坡稳定性分析

Analysis of Rock Slope Seepage Stability Under Crack Damage

为了分析岩体损伤和地下水渗流对边坡稳定性影响,基于极限平衡理论,推导出了考虑岩体损伤和地下水渗流时岩壁拽拖力以及裂隙渗流中发生管涌情况下岩质边坡的抗滑稳定性系数表达式;通过在怀通高速公路K117+900～K118+020处边坡进行相关物理力学试验,计算了多种条件下岩石边坡的稳定性安全系数。结果表明:岩体损伤程度越大,边坡稳定性越差;坡顶部裂隙积水越深,越不利于边坡稳定;当计算岩质边坡稳定性系数时,裂隙渗流对裂隙壁的拽拖力可不予考虑;随着积水深度的增加或持续暴雨时,因裂隙中发生管涌现象,其稳定系数值比不考虑发生管涌时低9%。

In order to analyze the impacts of rock damage and underground seepage on slope stability,this paper derived anti-sliding stability coefficient formulas under situations such as rock damage,rock drag force at underground water seepage or piping at fissure seepage based on the limit equilibrium method.Through relevant physical and mechanical tests on the slope at K117＋900~K118＋020 of Huaitong Expressway,calculation for the stability safety coefficient of rock slope under different conditions was conducted.The results show that the slope stability gets worse under bigger damage to the rock;the deeper the seeper in the slope fissure,the worse the slope stability would be;when calculating the rock slope stability coefficient,the drag force to the fissure wall from fissure seepage can be ignored;with deeper seeper or continuous storm rainfall,there would be piping in the fissure,and the stability coefficient value is about 9% less than that without consideration of piping.