某水电站进水口边坡变形特征及稳定性评价

某水电站是澜沧江中、下游梯级开发的关键工程,其进水口高边坡地质条件复杂。通过对该电站进水口边坡的物质组成、结构特征、以及边坡开挖等因素的综合分析研究,阐述了其变形机理,说明此高边坡存在如下变形破坏形式:①楔形体滑动破坏;②扩展式的平面型塌滑和滑移型崩塌破坏;③卸荷松弛变形破坏。采用三维块体分析和有限元数值模拟,分析了这类边坡在开挖过程中的应力变形特征及其变化规律。

Characteristics and Mechanism of Slope Deformation at Intake of One Hydropower Station

The Hydropower Station is the key project in the cascade development in the middle and lowers of Lancang River,with complex geological condition of high rock slope at the intake.Through studying lots of factors,such as different substantial components of slope,character of geological structure,excavation etc.,this paper illuminates mechanism of deformation of high rock slope at the intake,the mode of deformation and destruction of the high rock-stress slope,which have three main factors of deformation and destruction:(1)wedge-bodies sliding;(2)expanding collapse sliding of the plane type and sliding collapse;(3)unloading rebound.Three-dimensional finite element calculation and three-dimensional bulk analysis are used to analyze the regularities of stress field and displacement during excavations and demonstrate the mechanism of this deformation.