溪洛渡300m级高拱坝坝基的渗流稳定工程措施

Foundation Seepage Control Treatment for Xiluodu About 300m High Arch Dam

扼要介绍了溪洛渡300m级高拱坝的水文地质条件,并结合钻孔注水试验、单洞渗水试验、地下水示踪-连通试验和钻孔压水试验,详述了坝基岩体透水性、坝区岩体渗流特性、两岸地下水位及其动态变化规律、玄武岩的构造特点及其对渗透性的影响、坝区裂隙岩体透水性与风化卸荷的关系、坝区玄武岩的透水性、坝区茅口组灰岩的水文地质特点及渗透特性。根据坝址区水文地质及其渗流特性,制定了溪洛渡高拱坝的渗流稳定的工程措施。简要介绍了采用"复杂三维渗流控制分析计算程序"分析的成果。最后与二滩工程渗流稳定工程措施进行了比较。

This paper briefly presents geohydrolog conditions of Xiluodu high arch dam foundation, recounts the dam foundation rock mass permeability, dam area rock mass seepage characteristics and ground water level fluctuation through the bore hole water injection test, single hole seepage test, ground water tracing--communicating test and bore hole water pressure test. Base on the dam site area hydrogeologic conditions and seepage characteristics,the dam foundation seepage control treatment scheme is worked out. The analysis results by means of the complicated 3- dimensional seepage control analysis computer program are also shown in the paper. Finally, the dam foundation seepage control treatment scheme is compared with that of Ertan Hydroelectric Project.