高速公路斜坡填方路基失稳成因及治理研究——以重庆山区某段高速公路为例  

Causes and Treatment of Slope Filling Subgrade Instability of Expressway:Taking a Section of Expressway in Chongqing Mountainous Area as an Example

作　　者：赖国泉 Lai Guoquan(Northwest Research Institute Co.,Ltd.of C.R.E.C.,Lanzhou,Gansu 730000)

机构地区：[1]中铁西北科学研究院有限公司,甘肃兰州730000

出　　处：《资源环境与工程》2023年第4期475-480,共6页Resources Environment & Engineering

基　　金：渝湘复线高速公路科研项目“复杂堆积体路基边坡支护新技术研究”(KY-05)。

摘　　要：山区高速公路修建时,斜坡上填筑的高路堤经常产生滑动变形。以重庆山区某段高速公路为例,采用变形监测、工程地质勘察等方法,查明该段斜坡填方路基发生地质灾害的成因,分析其变形破坏模式,在此基础上开展工程治理。结果表明,斜坡填筑体宏观变形具有坡体后部拉张变形产生,中部及坡脚鼓胀挤压变形突出的特点,综合判断该斜坡填筑体处于挤压变形阶段;斜坡填筑体特殊的坡体结构是地质灾害发育的内因,地表水和地下水是斜坡变形的诱因;斜坡填筑体存在填土沿斜坡老地面整体滑动、填土沿基覆界线整体滑动、填土内发生圆弧滑动等3种破坏模式。基于此,提出采用抗滑桩支挡与仰斜排水孔疏排地下水相结合的治理措施。工后变形监测表明,治理工程是成功的。When constructing highways in mountainous areas,the filling of high embankments on slopes often causes sliding deformation.Taking a section of expressway in Chongqing mountainous area as an example,the engineering geological survey method and deformation monitoring methods are used to find out the causes of geological disasters in the slope fill subgrade and analyze its deformation and failure mode,and engineering governance is carried out on this basis.The results show that the macroscopic deformation of the slope filling body has the characteristics of tensile deformation at the back of the slope and bulging extrusion deformation at the middle and toe of the slope.It is comprehensively judged that the slope filling body is in the stage of extrusion deformation.The special slope structure of the slope filling body is the internal cause of the disaster development,surface water and groundwater are the inducing factors of slope deformation.There are three failure modes of the slope fill body,including the whole sliding of the fill along the old ground of the slope,the whole sliding of the fill along the boundary of foundation and overburden,and the circular sliding failure in the fill.Based on the engineering geological characteristics of slope fill,the treatment measures of groundwater drainage are put forward,which are combined with anti-slide pile retaining and sloping drainage hole.The deformation monitoring of post-work shows that the treatment project is successful.

关 键 词：斜坡填筑体 岩土工程 变形监测 变形模式 治理措施 

分 类 号：TU413.6[建筑科学—岩土工程]