白鹤滩水电站左岸出线竖井上段渗流控制措施研究  

Study of Seepage Control Measures for Upper Section of Outgoing Shaft of Baihetan Hydropower Station

作　　者：程普 万祥兵 方丹 李良权 CHEN Pu;WAN Xiang-bing;FANG Dan;LI Liang-quan(Huadong Engineering Corporation Limited,Hangzhou 311122,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司

出　　处：《云南水力发电》2020年第1期46-50,55,共6页Yunnan Water Power

摘　　要：白鹤滩水电站左岸出线竖井上段穿过地表覆盖层、强风化夹层及多条层间层内错动带。覆盖层物质主要为粉土质砾石和碎石混合土,粘粒含量较少,透水性强。出线竖井围岩总体上以微透水和弱透水岩体为主,但是上部强卸荷带内及层间、层内错动带部位局部为中等透水、强透水,水文地质条件复杂,渗水问题突出。针对出线竖井上段的渗水问题采用防渗与排水结合的处理措施,防渗措施采用固结灌浆、帷幕灌浆堵截渗漏通道,排水措施采用系统排水孔、随机排水孔配合排水盲管、防水板等对围岩渗水进行引排。对于穿过复杂水文地质条件、渗水处理要求严格的白鹤滩水电站出线竖井,采用上述措施的处理效果依然欠佳,需采取系统、有效、有针对性的渗控措施,保证出线竖井干燥的施工、运行环境。The upper section of outgoing shaft of Baihetan hydropower station passes through the surface overburden,strong weathering interlayer and multiple interlayer dislocation zones.The overburden is mainly composed of silty gravel and gravel mixed soil,which is strong permeability.Generally speaking,the surrounding rock of outgoing shaft is dominated by weak permeable rock mass,but the upper part of strong unloading zone and the interlayer staggered zone are partially strong permeability,the hydrogeological conditions is complex and the seepage problem is prominent.Aiming at the seepage problem of upper section of outgoing shaft,combination measures of seepage control and drainage is taken.Consolidation grouting and curtain grouting are used to prevent seepage.Drainage holes,drainage blind pipes and waterproof boards are used to drain water seepage from sxirrounding rocks.For outgoing shaft of Baihetan hydropower station which is complex hydrogeological conditions and strict requirements of seepage treatment,the treatment effect of the above measures is still not good.Systematic,effective and pertinent seepage control measures should be taken to ensure the construction and operation dry environment of the outgoing line shaft drying.

关 键 词：白鹤滩水电站 出线竖井 渗流控制 防渗排水 灌浆 

分 类 号：TV223.4[水利工程—水工结构工程]