山区公路半挖半填路基滑坡处治方案研究  

Study on treatment of landslide in mountain road with cut-and-fill subgrade

作　　者：单君 赵四汉 SHAN Jun;ZHAO Sihan(Zhejiang Institute of Communications Co.,Ltd,Hangzhou 310000,China)

机构地区：[1]浙江数智交院科技股份有限公司,浙江杭州310000

出　　处：《南昌工程学院学报》2021年第3期20-24,共5页Journal of Nanchang Institute of Technology

基　　金：国家重点研发计划项目(2016YFC0802203-11)。

摘　　要：山区高速公路建设中常遇到半挖半填路基,挖方边坡下紧邻填方边坡,填挖交界处易发生路基滑坡。以某山区高速公路半挖半填路基滑坡工程为例,通过地质条件、现场监测数据以及滑坡特征的分析确定滑坡成因和类型;然后基于强度折减法,采用plaxis 2d有限元软件研究不同位置打设抗滑桩时路基边坡的稳定性和位移,确定合理的处治方案;最后利用现场监测数据验证处治方案的可靠性。结果表明,填方加载破坏了原坡体的平衡条件,滑动面由上向下逐渐发展,为典型的中型—推移式—中层滑坡;清方减载和填方坡脚处打设抗滑桩的处治方案可有效减小坡体位移,增大边坡稳定性;施工期深层水平位移变形速率逐步减小,半挖半填路基边坡处于稳定状态,研究方法和处治方案对同类型的滑坡分析和治理具有一定的借鉴意义。In the construction of highway in mountainous area,the subgrade is often half excavated and half filled.A highway toll station square in a mountainous area is cut-and-fill subgrade.After the completion of filling,subgrade landslide occurs,which seriously affects the construction quality and bottom safety.Firstly,the landslide section topography and geological conditions are analyzed.Combining with field monitoring data of deep horizontal displacement,the subgrade landslide causes and types are determined.And then the finite element software plaxis 2d numerical model is established,using the interface element to simulate the sliding surface,and based on strength subtraction subgrade landslide stability safety factor is calculated.The displacement and stability of subgrade slope are studied when anti-slide piles are constructed at different positions.And the reasonable treatment scheme is determined.Lastly,the reliability of treatment scheme is validated with field monitoring data.The results show that the loading of the fill damages the equilibrium condition of the original slope body,and the sliding surface develops gradually from top to bottom,which is a typical medium-strip-middle-layer landslide.The treatment of load reduction and anti-slide pile at the foot of the filling slope can effectively reduce the displacement of the slope body and increase the stability of the slope.During the construction period,the deformation rate of deep horizontal displacement decreases gradually,and the slope of cut-and-fill subgrade is in a stable state.The research method and treatment plan have certain reference significance to the same type of landslide analysis and treatment.

关 键 词：半挖半填 滑坡 稳定性 有限元 处治方案 

分 类 号：TU[建筑科学]