路堑边坡施工期间失稳原因分析与治理  

Cause Analysis and Treatment of Instability of the Cutting Slope During Construction

作　　者：陈林 Chen Lin(Xiamen Municipal Engineering Design Institute Co.,Ltd.,Xiamen 361009,China)

机构地区：[1]厦门市市政工程设计院有限公司,福建厦门361009

出　　处：《市政技术》2024年第12期123-130,共8页Journal of Municipal Technology

摘　　要：为解决连续降雨导致施工期间路堑边坡失稳滑塌的问题,以福建省漳州市某城市次干路工程为例,当连续降雨后路堑边坡发生平面范围约200 m×55 m的失稳滑塌时,分析了滑坡现场周边地质特征以及失稳的原因,提出采用滑坡专项勘察方法,并结合高密度电法与面波法探测滑面与软弱面(老滑坡滑面),然后对失稳边坡进行了治理。分析结果表明,高密度电法与面波法能较好地分析滑坡影响因素、范围、形态特征、深度等,且与专项勘察结果接近。通过计算验证了路堑边坡失稳是由于边坡下存在老滑坡,且老滑坡滑面埋深较浅,在工程开挖与连续降雨的综合影响下,导致老滑坡部分复活;依据滑坡面状况提出了“抗滑桩+锚索”“放坡+锚杆”的方案并进行了比选,最后经过综合分析明确了以挖除老滑坡体为主的卸载治理方案。In order to solve the problem of instability and collapse of the cutting slope caused by continuous rainfall during the construction,the secondary trunk road project in Zhangzhou,Fujian Province was taken as an example.When the instability and collapse of the cutting slope with a plane range of about 200 m×55 m occurred after continuous rainfall,the geological characteristics around the landslide site and the reasons for the instability were analyzed.The special investigation method of the landslide was proposed to combine with the high-density resistivity method and surface wave method to detect the sliding surface and the weak surface(the old landslide sliding surface),and then the unstable slope was treated.The analysis results show that the high-density resistivity method and the surface wave method can better analyze the influencing factors,range,morphological characteristics and depth of the landslide well,which was close to the results of special investigation.Through the calculation,it is verified that the instability of the cutting slope is due to the existence of old landslides under the slope with shallow buried depth,which leads to the partial resurrection of the old landslide under the combined influence of engineering excavation and continuous rainfall;According to the landslide surface,the schemes of“slide-resistant pile+anchorage”and“slope cutting+anchor”were put forward and compared.Finally,the unloading treatment scheme based on the excavation of the old landslide body was clarified after comprehensive analysis.

关 键 词：边坡失稳 原因分析 高密度电法 面波法 老滑坡 滑坡治理 

分 类 号：U418.55[交通运输工程—道路与铁道工程]