【摘要】 针对太原西山大佛现状,根据大佛所处的地形地貌、地质构造、气象水文条件和场地工程地质条件,分析了影响大佛边坡岩体稳定性的主要因素,提出了大佛边坡岩体可能遭受的主要工况类型。大佛边坡直立,边坡岩体为二叠系厚层砂岩,岩层近水平略向坡内倾斜。区域构造节理切割和临空卸荷使大佛岩体呈松动块状。基于强度折减法的二维有限差分稳定性分析表明,边坡边缘局部变形可能导致陡崖由反向坡变为顺向坡,从而使大佛边坡趋于滑动失稳。进一步运用拟静力法和极限平衡法分析了多种工况条件下大佛松动岩体边坡的顺层抗滑动稳定性和抗倾覆稳定性。分析表明,仅在地震力作用下大佛陡崖岩体不会发生顺层滑动破坏,但存在向外倾覆崩落的危险;在排水不畅的条件下松动岩体裂隙充水对大佛陡崖边坡的抗滑稳定性会有显著影响;在裂隙静水压力和水平地震力联合作用下,大佛陡崖将失稳破坏。更多还原

【Abstract】 Based on the status quo of Jinyang Grand Buddha in Taiyuan, some factors such as topography, geological structures, climate, hydrology and engineering geology that influence the stability of the Buddha slope are considered, and several working situations of the slope possibly suffered are presented in this paper. The Buddha slope stands upright and the rock masses are composed of thick Permian sandstone, which dips slightly inwards the slope. Affected by both the incision of regional joints and the load relief to free surface, the rock mass of the Buddha slope has turned into loosened blocks. Numerical stability analysis by FLAC-2D based on strength reduction method reveals that the localized deformation of the rock masses near the vertical surface of the slope may trigger reversing of rock beddings making the back dip slope convert to a dip slope with the possibility of plane sliding failure. Furthermore, the pseudo-static method for the dynamic process and the limit equilibrium method for the static process are applied to different working situations of the Buddha slope. The analytical results illustrate that plane sliding failure will not occur when the slope is affected only by seism. However, water-filling in cracks of the loosened rock mass may greatly contribute to the potential plane sliding failure. When horizontal seism-force and hydrostatic pressure are coupled, the Buddha slope can hardly keep stable. Additionally, the loosened rock masses are prone to block toppling failure when influenced by the seism force.更多还原