南京某土石混合体边坡稳定性评价与治理措施研究

Study on Evaluation and Governance of Slope Stability of a Soil-rock-mixture in Nanjing

研究区位于南京市栖霞区,拟建工程破坏了坡体原有的稳定状态,对周边居民群众、建筑物造成了严重的安全威胁。通过对现场地质勘查,分析了滑坡地质灾害基本特征、成因及边坡现状特征,选取边坡典型性剖面,并评价其在天然、地震、暴雨3种工况下的稳定性,得出最危险滑动面及稳定性系数。计算结果表明,暴雨工况中,边坡整体产生较大位移,处于失稳状态。采用削坡减载、护坡墙、挡土墙、截排水等措施进行地质灾害治理,并结合现场实际监测数据,针对治理后边坡的稳定性进行评价。分析结果表明数值模拟位移与监测位移量均较小,未超出控制值,治理措施切实有效。

The research area was located in the Qixia District of Nanjing City, where had proposed construction project damaging the original stable state of slope and posing severe security threat to the surrounding residents and buildings. Through the geological survey on site, the basic characteristics and causes of landslide and current conditions of slope were analyzed, the typical profile of slope was selected to analyze its stability in natural, seismic and rainstorm conditions, and the most dangerous sliding surface and stability coefficient were obtained. The calculation results show that in heavy rain condition, the slope as a whole has a serious displacement and is in a state of instability. The geological hazard treatment is carried out by taking measures such as cutting slope and unloading, slope wall, retaining wall, water interception and drainage,etc., and the stability of the slope after the treatment is evaluated in accordance with the actual monitoring data on the spot. The analysis results show that both the numerically simulated displacement and the monitored displacement are very slight and below the control value, which proves the governance measures are effective.