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

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FLAC^3D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。

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

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 describedi;t is shown that the failure process of bedding rock slopet,hat isl,arge-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 shearing slide plane in the first-step slope.When the sliding plane cuts through,the slope will fail.The result of FLAC3D numerical modeling