岩质边坡水力驱动型顺层滑移破坏机制分析  

ANALYSIS OF BEDDING-SLIP FAILURE MECHANISM OF ROCK SLOPE DUE TO HYDRAULIC DRIVE

作　　者：刘才华[1] 徐健[2] 曹传林[2] 陈从新[1] 冯夏庭[1] 

机构地区：[1]中国科学院武汉岩土力学研究所,湖北武汉430071 [2]湖北沪蓉西高速公路建设指挥部,湖北恩施445000

出　　处：《岩石力学与工程学报》2005年第19期3529-3533,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金重点项目(50239070);国家重点基础研究发展规划(973)项目(2002CB412704);中国科学院武汉岩土力学研究所领域前沿基金项目(Q110217)

摘　　要：顺层边坡的稳定性主要取决于滑动面的物理力学性质和地下水对边坡岩体的水压力。在分析顺层边坡水力驱动型滑移破坏的形成与演变的基础上,探讨了地下水对顺层边坡稳定性的影响机制;指出地下水在边坡后缘张裂隙和滑动面形成的渗流通道中运动时,对滑体将产生3个方面的力学作用:张裂隙静水压力、滑动面扬压力和拖曳力;推导了边坡极限平衡状态下张裂隙临界充水高度和临界降雨强度的计算公式。分析结果表明,边坡后缘张裂隙充水高度直接决定了3种水压力的大小,当张裂隙充水高度达到临界值后,边坡在水压力作用下发生滑移破坏;且张裂隙充水高度与降雨强度呈线性关系。最后建立了顺层边坡水力驱动型滑移破坏判据。The stability of bedding rock slope is mainly affected by two factors, which are physico-mechanical properties of slide face and groundwater pressures. Based on analysis of formation and evolvement of rock slope bedding-slip failure due to hydraulic drive, the effect mechanism of groundwater on bedding rock slope stability is discussed. It is pointed out that groundwater flows through the passage that consists of the slide face and the top splay fracture of a rock slope produces static water pressure of splay fracture, flotage and haulage of slide face. Equations for calculating the critical water highness in the splay fracture and the critical rainfall intensity are developed. It is shown that： （1） water pressures above increase with increasing the water highness of the splay fracture; （2） the slope will lose its stability once the water highness of the splay fracture reaches to a critical value; and （3） the water highness of the splay fracture is linear with the rainfall intensity. The bedding-slip failure criterions of rock slope are put forward at length.

关 键 词：边坡工程 岩质边坡 顺层滑移破坏 水力驱动 

分 类 号：TD824.7[矿业工程—煤矿开采]