镇江市某岩质边坡稳定性评价及其治理措施研究

Stability Evaluation and Treatment Measures of a Rock Slope in Zhenjiang City

以镇江市某岩质边坡为研究对象,在现场勘查资料的基础上,利用极限平衡法及数值模拟法对其进行稳定性评价。结果表明,在天然工况下,边坡处于欠稳定状态;在降水和地震等因素影响下,位移增大,稳定性系数降低,其中在暴雨工况下,由于雨水下渗至岩体的节理裂隙中,增加了滑坡体的下滑力并导致岩体强度参数降低,最大位移量达到了43.97 cm,存在发生滑坡的隐患。根据该边坡的滑坡特征及破坏形式,采用削坡降坡、锚杆加固及布置截排水沟等治理措施对该边坡进行治理,3种工况下的稳定性系数分别达到1.660、1.580和1.652,坡体水平向最大位移大幅降低,表明该边坡在加固治理后处于稳定状态,治理措施合理可行。

In this paper,a rock slope in Zhenjiang was taking as the research object.The limit equilibrium method and numerical analysis method are used to evaluate its stability based on the field investigation data.The numerical simulation results show that under the natural conditions,the slope is under stable state.Under the influencing factors such as rainfall and earthquake,the maximum displacement increases,the stability coefficient reduces in different degrees.In the rainstorm conditions,the sliding force of a landslide increases and the strength of rock and soil mass decreases sharply because of the rain infiltration into rock joints and fissures.The maximum displacement of slope is 43.97 cm,so it exists the hidden danger of landslides.According to the landslide characteristics and the damage forms of the slope,the intercept treatment measures are cutting the slope grade,arranging the anchor reinforcement and intercept and drainage facilities and so on.Three kinds of working conditions of stability coefficient is 1.660,1.580 and 1.652,the horizontal displacement of slope also greatly reduced,which indicates that the slope after reinforcement treatment is in a stable state,and the treatment measures are effective.