南京市旅游学校西侧山体下蜀组黄土边坡稳定性评价与治理措施研究

Study on Loess Slope Stability Assessment and Governance Measures for Xiashu Formation in Nanjing School of Tourism West Massif

以南京市旅游学校西侧山体下蜀组黄土边坡为研究对象,利用极限平衡法和数值模拟法,计算边坡在天然、地震和暴雨工况下的稳定性系数,分析坡体位移和塑性区分布特征。计算结果显示,天然边坡基本稳定,地震和暴雨工况下坡体不稳定;极限平衡法与数值模拟法计算结果基本一致;三种工况下,坡体受地震力和暴雨影响,坡体位移加大,稳定性系数降低,暴雨作用比地震力影响更明显,坡体更容易受降雨影响。通过削坡减载、锚杆加固,设截排水沟等措施治理之后,坡体稳定性系数得到明显提高,边坡不同部位位移较小,边坡处于稳定状态,说明所采用的加固措施合理可行。

Taking a loess slope of Xiashu Formation in the Nanjing School of Tourism west massif as subject investigated,through limit equilibrium method and numerical simulation method have computed stability coefficient under natural,earthquake and torrential rain working conditions,analyzed slope mass displacement and plastic zone distribution features.Computed results have shown that the slope under natural working condition is basically stable,but under earthquake and torrential rain working conditions are unstable.Computed results from limit equilibrium method and numerical simulation method are basically consistent.Under the three working conditions,slope mass impacted by earthquake and torrential rain,displacement increased and stability coefficient decreased,the impact from torrential rain is more obvious than under earthquake.After governance measures of slope cutting and load reduction,anchor bolt reinforcement,water catch and drainage ditches,slope mass stability coefficient has obviously improved,less displacement in different slope parts.Thus the slope is in stable state,illustrated reinforcement measures are reasonable and feasible.