汤屯高速公路顺层岩质边坡变形机制分析及治理对策研究  

STUDY ON DEFORMATION MECHANISM AND CONTROL METHOD OF BEDDING ROCK SLOPE ALONG TANGTUN EXPRESSWAY

作　　者：黄润秋[1] 赵建军[1] 巨能攀[1] 邓辉[1] 段海澎[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家专业实验室,四川成都610059

出　　处：《岩石力学与工程学报》2007年第2期239-246,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金重点项目(90102002)

摘　　要：通过对汤屯高速公路顺层边坡现场工程地质条件的系统调查,首先对边坡的岩体结构类型及其成因机制、结构面与坡面组合特征进行细致研究,在此基础上通过FLAC3D数值模拟,结合工程地质条件分析,对其变形破坏机制进行深入探讨。研究结果表明,边坡处于滑移弯曲–滑移拉裂复合型滑坡的初始阶段,边坡的变形受层间软弱夹层及岩体结构控制作用明显,坡体中上部块体沿层间软弱夹层产生滑动,受下部岩体约束,在坡体最薄弱部位–开挖面附近产生弯曲变形;受弯曲部位推力作用,第一级边坡碎裂岩体中逐渐产生剪切滑动面,并与弯曲部位岩体中滑移切出面贯通,最终破坏。基于变形机制分析的治理措施将重点放在控制碎裂岩体和潜在剪出口的变形上,监测结果表明,边坡达到稳定性要求。The engineering geological conditions of a bedding rock slope along Tangtun expressway are investigated systematically; then the types and causes of rock mass structures and the combination between structural planes and slope surface are studied in detail so as to analyze the bedding slope deformation mechanism. A geological model of the bedding rock slope is described by engineering geological profile and partitioned-area map of rock mass structure listed in the paper. The slope evolvement sketch of mechanism from deformation to failure is described; it is shown that the failure process of bedding rock slope, that is, large-scale blocks cut by rock bedding and intense joint band in upper-middle slope slide through bedding weak layer, and rock bends to the surface near slope where cataclastic rock mass exists, which causes the distortion and sheafing slide plane in the first-step slope. When the sliding plane cuts through, the slope will fail. The result of FLAC^3D numerical modeling indicates that the tension stress distributes along bedding weak layer and in cataclastic rock near slope surface; and potential sliding plane cuts through gradually. The result indicates that bedding weak layer and rock mass structure controls the types of slope deformation; and the present deformation is included in the beginning of the failure type of ＂creep-fracture and creep-bending＂. Slope reinforcement based on the analysis of deformation mechanism focuses on controlling the distortion of cataclastic rock mass and potential shearing exit. Anti-slide pile combined with prestressed anchor and prestressed anchor frames are implemented to reinforce the potential landslide; and drainage works as auxiliary measures are also implemented. The monitored deformation curve indicates that the slope is stable in the rainy season.

关 键 词：边坡工程 顺层边坡 岩体结构 结构面 变形机制 高速公路 

分 类 号：P642.22[天文地球—工程地质学]