南京市某牵引式滑坡稳定性评价及处理措施研究

Stability Evaluation and Treatment Measures of a Traction Landslide in Nanjing

滑坡是一种常见的地质灾害,常给人民生命财产和工农业带来巨大损失,有时甚至造成毁灭性灾难.研究区位于南京市鼓楼区,近几年由于厄尔尼诺现象带来的影响,南京市降雨偏多,鼓楼区丘岗地带地质灾害频发.通过对研究区现场进行勘察,查明了该滑坡的基本特征、形成原因及现状.选取典型剖面进行数值计算,得出稳定性系数和最危险滑动面,评价该边坡在天然、地震、暴雨三种工况下的稳定性.由计算结果可知,研究区内该坡体在天然、地震、暴雨三种工况下分别处于稳定状态、基本稳定状态和不稳定状态,极限平衡法三种工况计算所得稳定性系数分别为1.188、1.070和0.941,有限元法计算结果分别为1.16、1.06和0.92.采用锚拉抗滑桩、挡土墙、截排水等措施对该边坡进行治理,并对治理后的边坡进行稳定性计算分析.结果表明,治理措施大大提高了该边坡的稳定性,三种工况均处于稳定状态.

Landslide is a common geological disaster,which often brings huge losses to people’s lives and property,industry and agriculture,and sometimes even causes devastating disasters.The research area is located in Gulou District,Nanjing.In recent years,due to the influence of El Niño phenomenon,Nanjing has had more rainfall and frequent geological disasters in the hilly areas of Gulou District.Through the site survey in the study area,the basic characteristics,formation reason and current status of the landslide were found out.A typical section was selected for numerical calculation,the stability coefficient and the most dangerous sliding surface were obtained,and the stability of the slope under three conditions of natural,earthquake and heavy rain was evaluated.It can be seen from the calculation results that the slope in the study area was in a stable state,a basic stable state and an unstable state under the three working conditions of natural,earthquake and heavy rain,respectively.The stability coefficients calculated by the three working conditions of the limit equilibrium method were 1.188,1.070 and 0.941 respectively,the finite element method calculation results were 1.16,1.06 and 0.92 respectively,the slope was treated with anchored antislide piles,retaining walls,interception and drainage,and the stability calculation and analysis of the treated slope were performed.The results showed that the treatment measures greatly improved the stability of the slope,and the three working conditions were in a stable state.