兰渝铁路D1K 641工程滑坡变形模式与整治方案  

The Deformation Mode and Renovation Method for D1K 641 Engineering Landslide in Lanzhou-Chongqing Railway

作　　者：陈丽[1] 刘剑光[1] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2014年第2期62-65,共4页High Speed Railway Technology

摘　　要：兰渝铁路D1K 641路堑工点属于典型的四川红层软岩路基。文章详细地介绍了D1K 640＋887．25～D1K 641＋266．75段左侧路堑边坡施工及边坡变形情况。该段工程在施工过程中由于受到连续强降雨的影响，堑顶上方出现了阶段性的裂缝、错台；路堑前缘多级拉张，在后缘形成切层滑动，前缘沿层面剪出，使已建的天沟、空窗式护墙、边坡防护等工程遭到破坏。后经地质补勘，对滑坡变形进行试验并详细分析得出：软岩遇水后，岩体发生楔裂性崩解，强度大大降低，并产生较大“楔裂扩张力”，在水平方向产生较大推力，致使边坡向外滑移，从而形成牵引式工程滑坡。文章归纳总结了近水平岩层边坡变形破坏模式，提出了切实可行的工程整治方案，这对整治既有工程滑坡、预防近水平软岩边坡变形破坏具有重要实际意义。The construction site of cut located in the section of D1 K641 in Lanzhou-Chongqing Railway is the typical red bed soft rock subgrade.In this paper,the construction and deformation of cut slope at the section of D1 K641 ＋887.25 ~D1 K641 ＋266.75 in Lanzhou-Chongqing Railway are presented in details.Due to the continuous and strong rainfall dur-ing the construction,periodical cracks and staggered steps took place at the top of cut.Moreover,the multistage traction happened at the front edge of cut,and the cutting layer sliding was formed at the back edge,that made the facilities like gutter,empty-window curtain wall,slope protection destroyed.After the supplement geological survey,test and analysis were undertaken for the landslide deformation.The results are：when the soft rock is exposed to water,the wedge crack-ing disintegration happened to the rock,so that the strength is largely decreased and larger wedge cracking expansion force is produced.In addition,a larger thrust along horizontal direction is also induced,causing the slope to slip out-ward,which forms pull-type engineering landslide.The deformation failure mode of nearly-horizontal rock slope is sum-marized in this paper,and a feasible renovation method is put forward,which are practically significant for the renovation of landslides in the existing projects and for the prevention of the deformation failure of nearly-horizontal soft rock slope.

关 键 词：工程滑坡 变形模式 整治方案 

分 类 号：U213.158[交通运输工程—道路与铁道工程] P642.22[天文地球—工程地质学]