某水电站库区倾倒变形体稳定性研究

摘要

Large-scale toppling rock mass comes into existence at a hydropower station on the Yalong River bank. This paper deals with engineering geological features, deformation mechanism and instability model for the toppling rock mass and assesses its stability under various conditions by means of calculation using limit equilibrium method and discrete element method.%受早期地壳抬升及岩体卸荷作用，雅砻江某水电站库区右岸近坝库段存在大规模的倾倒变形体。在电站施工和水库蓄水过程中，变形体可能受扰失稳，对大坝等水工建筑物安全构成威胁。通过研究变形体工程地质特征及形成机制，结合对变形体的影响因素，分析了变形体可能的失稳模式，并分别采用极限平衡法和离散元法进行计算分析，对变形体在蓄水前后的天然、暴雨、地震及水位骤降等不同工况下的稳定状况进行了深入的研究和可靠的评价。