【作者】 段斌； 张林； 徐进；

【Author】 Duan Bin;Zhang Lin;Xu Jin;Dadu River Hydropower Development Co.,Ltd.;College of Hydraulic and Hydroelectric Engineering,Sichuan University;

【机构】 国能大渡河流域水电开发有限公司； 四川大学水利水电学院；

【摘要】 开展深厚覆盖层上高闸坝基础强度参数与变形特性弱化试验研究对深厚覆盖层上的闸坝工程建设具有非常重要的意义。大渡河丹巴水电站首部枢纽采用混凝土闸坝,闸坝最大坝高38.5m,闸基覆盖层最大厚度达127.66m,且结构及组成复杂。基于丹巴闸基加固处理方案,针对闸基各覆盖层的强度与变形特性弱化问题,采用MTS815 Flex Test GT岩石力学试验系统,具体通过水压～应力耦合试验和原状样、重塑样对比试验,揭示出丹巴水电站闸基各覆盖层在水压和围压下的主要力学特性及弱化效应,得到相应的弱化率及弱化参数,以此确定地质力学模型试验中闸基材料的降强幅度,为丹巴闸坝整体稳定地质力学模型综合法试验提供依据。更多还原

【Abstract】 This research is of great significance to the construction of gate and dam projects on deep overburden.The first hub of the Danba Hydropower Station on the Dadu River adopts a concrete gate dam. The maximum dam height of the gate dam is 38.5 m,and the maximum thickness of the gate base covering is 127.66 m.The structure and composition are complex.Based on the reinforcement treatment scheme of the gate foundation,the MTS815 Flex Test GT rock mechanics test system is used. Through the coupling test of hydraulic pressure and stress, and the comparison test between the original sample and the remodeled sample,the main mechanical properties and weakening effects of each covering layer of the gate foundation under hydraulic pressure and confining pressure are revealed.The weakening rate and weakening parameters determine the strength reduction range of the gate foundation material in the geomechanical model test.This research provides the basis for the comprehensive method test of the overall stability of Danba Gate Dam.更多还原