某小(1)型水库大坝坝基岩体渗透性分析  

Permeability Analysis of a Small(1) Reservoir Dam Foundation Rock

作　　者：司海宝[1] 李会[1] SI Haibao;LI Hui(School of Civil Engineering and Architecture,Anhui University of Technology,Ma’anshan 243032,China)

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243032

出　　处：《安徽工业大学学报（自然科学版）》2018年第1期61-65,共5页Journal of Anhui University of Technology（Natural Science）

基　　金：安徽省教育厅重点项目(KJ2014A030);国家科技支撑项目(2011BAK12B09);地质调查资助项目(1212011120072)

摘　　要：以某拟建的工程规模为小(1)型的水库为研究对象,其库区区域分布灰绿色厚层砾岩,表层岩体呈强风化特征。为全面评价水库坝基岩体渗透性,沿坝基轴线、上游和下游合理布置12个勘探孔,进行65段压水试验,从而确定坝基轴线相对不透水层深度。试验结果表明:坝基区域发育厚度11.0~16.2 m强风化砾岩层裂隙较发育,透水率大于5 Lu,渗透性较强;底部为弱风化砾岩层,渗透性较弱,可以作为坝址相对不透水层;库区存在绕坝和坝基渗漏隐患,防渗深度应深入相对不透水层1 m,绕坝防渗应沿坝轴线向两岸延伸,延长宽度根据正常蓄水位线与相对不透水层的交点确定。Take a to be built small(1)scale reservoir as the object of study.The reservoir is covered with grey-green thick conglomerate rock,and the surface of conglomerate rock is strongly weathered.In order to comprehensively evaluate the permeability of the dam foundation,12 exploration holes was set along the axis of the dam foundation,and 65 sections of water pressure tests were performed to determine the depth of relatively impervious layer of dam site.The results of tests show that fissures are developed,water permeability is more than 5 Lu and the permeability is strong for the 11.0-16.2 m strong weathered conglomerate on dam foundation.The permeability of weak weathered conglomerate at the bottom is weak,it can be take as relative impervious layer of dam site.Meanwhile there are hidden risks around the dam and on dam foundation in the reservoir area,the anti-seepage should dig deep into relative impermeable layer by 1 m and anti-seepage should extend to both sides along the axis of the dam.The extended length is determined by the intersection of the normal water level line and the relative impermeable layer.

关 键 词：水库 坝基渗透 压水试验 透水率 

分 类 号：TU411.01[建筑科学—岩土工程]