龙滩水电站左坝肩蠕变体B区治理研究及实践

龙滩水电站是目前世界上已建或在建的最高碾压混凝土重力坝.受地形地质条件的限制,左岸地下厂房进水口紧靠已经发生弯曲倾倒变形的反倾向层状结构蠕变岩体,其体积约1200×104m3.主要对B区岩体的倾倒蠕变特性及成因进行分析,通过多方案比较优化研究,确定了以排水为主,压脚治理为辅的综合治理设计方案.为评价治理效果,运用多种方法对边坡的稳定状态进行了数值计算分析,以及对监测资料进行了综合归纳分析,认为:强风化线或蠕变岩体折断面控制着边坡岩体的变形,岩体变形速率逐渐变小,目前已经基本稳定.

Research and Practice of Treatment for Creep Zone B in Left Dam Abutment of Longtan Hydropower Station

Longtan Hydropower Project is the highest RCC gravity dam in the world today.Due to the limitation of topographical and geological conditions,the power intakes on the left bank have to be arranged just close to a distorted,overturned,counter-dip creeping rock mass with bedded structure,which has a volume about 12 million m3.This thesis focuses on analysis of the creep behavior and genesis of the rock mass at Zone B;and based on the optimization study on several alternatives,a composite treatment scheme "drainage-oriented and slope stabilization treatment assistant" is finalized.In order to evaluate the treatment effects,the design criteria and parameters for the slope stability analysis are put forward.Several methodologies have been introduced into the calculation and analysis and study regarding the stability status of Zone B slope.and the monitoring records are subjected to synthesis.It is concluded that furthermore the deformation of slope rock mass is controlled by the strongly weathering line or the broken profile of creep rock mass,the rock mass deformation rate becomes low gradually,and the rock mass is basically stable up to now.