透水衬砌对乌东德水电站尾水洞Ⅳ类围岩的影响研究  

Study on the influence of permeable lining on class Ⅳ surrounding rock cave section of tailwater tunnel in Wudongde Hydropower Station

作　　者：井发坤 刘铁峰 王梓帆 王团乐 刘冲平 JING Fakun;LIU Tiefeng;WANG Zifan;WANG Tuanle;LIU Chongping(Changjiang Three Gorges Survey and Research Institute Co.,Ltd.,Wuhan 430074,China)

机构地区：[1]长江三峡勘测研究院有限公司(武汉),湖北武汉430074

出　　处：《水利水电快报》2023年第2期73-77,92,共6页Express Water Resources & Hydropower Information

摘　　要：为给乌东德水电站尾水洞Ⅳ类围岩洞段选取适当的地下洞室衬砌形式,分析了该洞段围岩的岩石矿物组成、物理力学性质、结构面性状、岩体完整性及透水性等岩体特性,从地下水对围岩的软化作用和围岩渗透破坏方面评价了透水衬砌对围岩的影响。结果表明:Ⅳ类围岩洞段总体具有不易被地下水软化的特点,地下水对围岩稳定影响小,采用透水衬砌不会产生渗透破坏。研究成果可为尾水洞衬砌设计提供参考。In order to select the correct form of underground cavern lining for class Ⅳ surrounding cave section of tailwater tunnel of Wudongde Hydropower Station, rock characteristics such as the rock mineral composition, physical and mechanical properties, structural surface properties, rock mass integrity and water permeability of the surrounding rock of the cave section were analyzed, and the influence of permeable liningon surrounding rock were evaluated from the softening effect of groundwater on surrounding rock and permeability destruction of surrounding rock.The results showed that class Ⅳ surrounding cave section was not easy to be softened by groundwater, and groundwater had little influence on the stability of the surrounding rock.The use of permeable lining will not cause seepage damage.The results can be a reference for lining design of tailwater tunnel.

关 键 词：Ⅳ类围岩 尾水洞 透水衬砌 乌东德水电站 金沙江 

分 类 号：TV554.14[水利工程—水利水电工程]