硬岩中倾顺层斜坡变形特征和破坏机理

Deformation and failure mechanism of moderate-dip cataclinal hard-rock slope

顺层岩质斜坡是极易失稳、危险最大并且工程地质问题最多的边坡。因此顺层岩质斜坡的稳定性和处理措施对于工程的建设极为重要。深入调查了某斜坡所在区域的地形地貌、地层岩性、地质构造和水文地质条件,分析斜坡的岩体结构特征,建立斜坡的地质模型,并运用数值模拟软件UDEC对斜坡进行模拟,模拟出斜坡的变形破坏特征。通过分析得到该斜坡的变形破坏机理。研究结果表明,由于岩体受到长期的风化作用,在一定的深度范围内,风化张拉裂隙十分发育,并且具有粉质黏土充填,从而大大降低了抗剪强度,这是影响中倾角顺层斜坡产生变形破坏的控制性因素。研究硬岩中倾顺层斜坡的变形破坏机理对其他类似工程的稳定性评价及治理措施提供参考。并证明离散单元法是对顺层岩质斜坡进行数值模拟的十分有效方法。

The stability and treatment of cataclinal hard-rock slope are very important to construction of highway. This paper deeply analyses the topography, lithologie and tectonic features of stratum, hydro-geologic conditions in one slope. Numerical simulation software UDEC is used to simulate the deformation and failure characteristics of the slope and get the deformation and failure mechanism of it. The result indicates that the joint of weathering and unloading of the slope are developed because of long-time weathering, and the joints are filled with silty clay, thus the shear strength reduces greatly and this leads to the sliding of the moderate-dip cataclinal slopes. The conclusion may be useful for the stability assessment and regulation measures of similar engineering. Furthermore, it proves that the diserete element method is very effective to numerical simulation on bedding rock slopes.