某填埋场垃圾堆体边坡失稳过程监测与反分析

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1、第29卷第8期岩石力学与工程学报Vol.29No.82010年8月ChineseJournalofRockMechanicsandEngineeringAug.，2010某填埋场垃圾堆体边坡失稳过程监测与反分析詹良通，管仁秋，陈云敏，刘钊(浙江大学软弱土与环境土工教育部重点实验室，浙江杭州310027)摘要：某填埋场是国内首批在场底铺设复合衬垫系统的大型卫生填埋场，该场垃圾坝前堆体边坡于2008年6月连续强降雨期间发生失稳事件。介绍该堆体边坡失稳过程的现场监测结果，包括坡面水平位移、深层侧向位移和渗滤液水位。基于

2、监测数据，开展堆体边坡稳定性反分析工作，探讨复合衬垫系统界面抗剪强度取值方法，提出抽排竖井迫降水位、铺膜防渗等应急抢险措施。现场监测和理论分析结果表明：堆体边坡中高渗滤液水位是导致其失稳的关键因素，堆体边坡水平位移速率和渗滤液水位高度呈明显正相关关系；该堆体边坡失稳模式是沿场底复合衬垫系统中软弱界面的深层滑移；斜坡场底上复合衬垫系统在滑移过程中发生位移–软化效应，其界面强度介于峰值强度和残余强度之间；抽排竖井迫降水位是最直接、有效的应急抢险措施。关键词：边坡工程；垃圾填埋场；复合衬垫系统；现场监测；渗滤液水位；水

3、平位移；反分析中图分类号：P642文献标识码：A文章编号：1000–6915(2010)08–1697–09MONITORINGANDBACKANALYSESOFSLOPEFAILUREPROCESSATALANDFILLZHANLiangtong，GUANRenqiu，CHENYunmin，LIUZhao(MOEKeyLaboratoryofSoftSoilsandGeoenvironmentalEngineering，ZhejiangUniversity，Hangzhou，Zhejiang310027，Chi

4、na)Abstract：ThelandfillstudiedinthispaperisoneoftheearliestsanitarylandfillswithcompositelinersysteminstalledinChina.AslopefailuretookplaceinthelandfillasaresultofsuccessiveheavyrainfallsinJune2008.Afieldmonitoringprogramwascarriedouttorecordtheslopefailurepr

5、ocess.Themonitoringitemsincludesurfacehorizontaldisplacement，deeplateraldisplacement，andleachatelevelwithintheslope.Onthebasisofthemonitoringresults，backanalyseswerecarriedouttoaccesstheslopestability，aswellastodetermineinterfaceshearstrengthofthecompositelin

6、ersystem.Thispaperalsoreporttheemergencymeasurestakenforpreventingfurthercatastrophicfailureofthehugelandfill.Thefieldmonitoringandtheoreticalanalysescametothefollowingconclusions.Thehighleachatelevel，whichwasfoundtobecloselycorrelatedwiththemeasureddisplacem

7、entrateobservedinthelandfillisamajorfactorleadingtotheslopeinstability.Themeasurementofdeeplateraldisplacementindicatedthatthesliptookplacealongtheweakinterfaceofthecompositelinersystematthebottomoflandfill.Thesignificantlateralmovementofwastebodyresultedinad

8、isplacement-softeningeffectontheinterfacestrengthofcompositelinersystem，andhencetheshearstrengthalongthelinerwasinbetweenthepeakandresidualstrength.Drawdownofleachatelevelbypumpingfromver