小浪底水库土石坝斜心墙应力监测与分析.pdf

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1、水利水电技术第45卷2014年第9期小浪底水库土石坝斜心墙应力监测与分析喻和平1，张聪1，张贵金1，梁经纬2，袁明明1，陈熙源1(1．长沙理工大学水利工程学院，湖南长沙410114；2．河海大学土木与交通学院，江苏南京210098)摘要：以小浪底水库土石坝斜心墙应力监测资料为基础，对其斜心墙孔隙水压力、土压力及拱效应进行探讨。分析表明：该斜心墙孔隙水压力受施工、防渗料等影响，与库水位变化规律存在一致、滞后及不一致三种情况。同时，其土压力变化分为土压力上升期、土体快速固结期(土压力下降期)及土压力随库水位有规律变化期三个阶段，越靠近斜心墙上游，三个阶段的变化越明显，越靠近斜心

2、墙下游，三个阶段的变化越不明显。而且，斜心墙拱效应从上游到下游依次减小，在运行初期增大，之后其系数变化与库水位变化正相关，测点越往下游，年变幅越小。关键词：小浪底水库；土石坝；斜心墙；应力监测；孔隙水压力；土压力；拱效应中图分类号：TV698．11文献标识码：A文章编号：1000-0860(2014)09—0030—05StressmonitoringandanalysisoHclaycore-wallinearth-rockf'dldamofXiaolangdiProjectYUHepin91，ZHANGCon91，ZHANGGuijinl，LIANGJingwei2，Y

3、UANMingmin91，CHENXiyuanl(1．SchoolofHydraulicEngineering，ChangshaUniversityofScienceandTechnology，Changsha410114，Hunan，China；2．CollegeofCivilandTransportationEngineering，HohaiUniversity，Nanjing210098，Jiangsu，China)Abstract：Basedonthestressmonitoringdataoftheinclinedcore-wallintheearth—roekf

4、illdamofXiaolangdiReservoir，theporewaterpressure．earthpressureandarchingeffectoftheinclinedcore．wallarestudiedherein．Theanalysisshowsthatundertheim—pactsfromconstruction，anti．seepagematerials，etc．，threecasesarethereforthechanginglawbetweenboththeporewaterpres。sureoftheinclinedcore．wallandt

5、hereservoirwaterlevel，i．e．consistence，hysteresisandinconsistence．Meanwhile，thechangeofitsearthpressureisdividedintothreestages．i．e．theearthpressurerisingperiod，therapidearthconsolidationperiod(earthpressuredecliningperiod)andtheperiodoftheregularchangeoftheearthpressurealongwiththereservoi

6、rwaterlevel．Sofarasthechangesofthethreestagesayeconcerned，theclosertotheupstreamoftheinclinedcore—wall，themoreevidentthechangesofthethreestagesayetobe：theclosertothedownstreamoftheinclinedcore—wall，tllemoreunevidentthechangesofthethreestagesaretobe．Furthermore．t}】learchingeffectoftheinclin

7、edCOre．wallissuccessivelydecreasedfromtheupstreamtothedownstreamandthenincreasedintheearlyperiodoftheoperation；thereafter，thechangeofitscoefficientispositivelycorrelatedtothechangeofthereservoirwaterlevel．whileforthemonitoringpoint，theIEtoreclosertothedownstre