强透水地基上土石坝非饱和渗流数值分析.pdf

《强透水地基上土石坝非饱和渗流数值分析.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、第35卷第8期人民黄河Vo1．35．No．82013年8月YELL0WRIVERAug．，2013【水利水电工程】强透水地基上土石坝非饱和渗流数值分析刘晓庆，陈峰，吴宇峰(1．西华大学能源与环境学院，四川I成都610039；2．黄河勘测规划设计有限公司，河南郑州450003)摘要：基于工程实际，采用非饱和渗流分析方法，探讨了强透水地基上土石坝下游排渗系统对渗流场的影响。结果表明：集水廊道和辐射井能有效降低浸润线，排渗效果好，但地基渗透坡降增大；单独修建集水廊道可减小下游浸没面积，但无法完全预防浸没现象，辐射

2、井和集水廊道联合作用能有效收集水库渗水，下游地面不会出现浸没现象；坝基是主要的渗漏通道，集水廊道和辐射井的修建并没有使坝体渗漏情况有显著变化；辐射井在收集渗水的同时需要合理控制井内水深，防止辐射井将下游原有地下水排走，造成地下水向上游倒流；采用非饱和渗流模型同时反映了饱和区与非饱和区渗流情况，较为符合工程的实际情况。关键词：辐射井；集水廊道；土石坝；渗流中图分类号：TV139．14文献标志码：Adoi：10．3969／j．issn．1000—1379．2013．08．038AnalysisofSaturat

3、ed-UnsaturatedSeepageinEarth-RockFillDamwithHighPerviousFoundationLIUXiao—qing’．CHENFeng。WUYu—feng(1．SchoolofEner~andEnvironment，XihuaUniversity，Chengdu610039，China；2．YellowRiverEngineeringConsultingCo．Ltd，Zhengzhou450003，China)Abstract：Thechangeofseepagef

4、ieldwasinvestigatedundertheconditionsofdrainagesysteminthedownstreamofearth-rockfiUdamwithhighpervious~undationbasedontheactualprojectcondition．Theanalyticmethodofsaturated—unsaturatedseepagewasusedtostudythedistributedcharacterofseepagefield．Theresultssho

5、wthatthejointactionofcollectiongalleryandradiationwellcanreduceeffectivelythephreaticlineinthedamandbeeasilytodrainseepingwater．However，itcausestheincreaseofhydraulicslopeoffoundation．Theapplicationofcollectiongalleryde-creasessubmergeareasinthedownstreamo

6、fdam，butitcannotforecasttherangeofsubmerge．Moreover，thejointactionofcollectiongalleryandradiationwellcancollectalargenumberofwaterfromtheleakageofthedamandtheregionofsubmergeisnotobservedinthedownstreamofdam．Theleakageofdamfoundationplaysanimportantroleina

7、llleakage．Thereisnotagoodimprovementofseepagecontro1．Furthermore，theresuhsindicatethatthedepthofwaterintheradiationwellshouldbereasonablycontrolledinordertopreventthebackflowofgroundwaterowingtothedrainingofgroundwater．Theanalysisofseepageisreasonabletoact

8、ualprojeetsbecausetheseepagefieldinthesaturatedregionandsaturated—un‘saturatedregioncanbereflectedwiththeaidofsaturated-unsaturatedseepagemode1．Keywords：radiationwell；collectiongallery；earth·rockfil1dam；seepa