公路路基边坡失稳风险及处治效果评价研究

Evaluation and Study of the Instability Risk and Treatment Effect of Roadbed Slope

针对运营期公路路基高边坡滑坡风险,基于边坡风险评估理论框架,以山西省陵沁线K5+820~K6+190公路路基为例,采用现场调研和数值仿真手段探明了滑坡成因及类型,分析得到滑坡发生概率及平均安全系数分别为21.2%和1.036;通过对灾害抵达承灾体概率、承灾体易损性及财产价值等重要参数进行分析,评估得到滑坡可能造成交通断道、半幅路基及转盘景观损坏,总财产损失为267.2万元人民币;从治理效果、成本费用及施工难度等方面对滑坡处治技术方案进行对比分析,结果表明在处治效果满足工程要求的条件下,抗滑桩预应力锚索+坡面框架锚索方案治理成本及施工难度都相对较低,为优选方案。现场监测结果显示,处治方案治理效果良好,节省了工程费用的同时提前3个月实现通车。

Based on the theoretical framework of slope risk assessment,in this paper the roadbed of K5+820~K6+190of Lingqin Highway in Shanxi Province is taken as background,field investigation and numerical simulation are used to verify the causes and types of the landslide.According to the analysis,the occurrence probability and average safety factor of the landslide are 21.2%and 1.036respectively.Through the analysis of important parameters such as the probability of the disaster reaching the disaster bearing body,the vulnerability of the disaster bearing body and property value,it is estimated that the landslide may cause traffic break,half roadbed and landscape damage,and the total property loss is 2.672 million yuan.The results show that under the condition of engineering requirements,the treatment cost and construction difficulty of anti-slide pile prestressed anchor cable+slope frame anchor cable scheme are relatively low,which is the preferred scheme.The field monitoring results show that the treatment scheme has a good treatment effect and the project cost is saved and the project is opened to traffic three months in advance.