碎裂结构路堑岩质边坡稳定性评价与治理设计

以湖北省209省道宣恩段东门关隧道进口段的典型碎裂结构路堑岩质边坡为例,针对该边坡工程地质、水文地质、岩体结构特征以及前期变形破坏迹象,判断出边坡的可能破坏模式,并在此基础上,通过现行规范推荐的不平衡推力传递法,对边坡的稳定性进行评价。在治理设计过程中,提出避开规范使用的常规技术,而采用削坡、锚杆、格构以及挡墙等措施,为解决碎裂结构路堑岩质边坡的分析与治理难题提出一种新的思路。

Stability Analysis and Treatment Design of A Loosen Structure Road Cutting Rock Slope

The road cutting rock slope above the Dongmenguan tunnel in xuan-En sector of Hubei Province 209 highway,is a typical loosen structure. According to characteristics of engineering geological,hydrological,structure of rock mass and prior symptom of deformation and failure of the slope,potential types of slope failure are identified,and un-equilibrium pushing method commended by present criterion is used to calculate the slope stability and to process treatment design.During remediation for the slopes of loose material,general treatment techniques always bring many problems such as the extrusion of soil above top of pile,the extrusion of soil between piles,and the decay of anchoring forces in cable bolts,so techniques relating to cutting,anchoring,structure beam and retaining wall are proposed to substitute techniques caused problems. A new method about solving the problems of analyzing and remedying loosen structure road cutting rock slope is presented.