Long-term performance of contaminant barrier systems.pdf

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1、Rowe,R.K.(2005).Ge´otechnique55,No.9,631678Long-termperformanceofcontaminantbarriersystemsR.K.ROWE*ThislecturedescribesthelatestfindingswithrespecttoCetexpose´donnelesdernie`resconclusionssurlaper-thelong-termperformanceofmodernmunicipalsolidformancea`longtermedessyste`m

2、esdebarragemoder-waste(MSW)landfillbarriersystems.Fielddatarelatingnesdanslesde´chargesmunicipalesdede´chetssolidestothecloggingofleachatecollectionsystemsandthelatest(MSW).Nousexaminonslesdonne´esdeterrainrelativestechniquesforpredictingtheirperformanceareexamined.a`l’e

3、ngorgementdessyste`mesdecollecteauleachateItisindicatedthattheprimaryleachatecollectionsystemsainsiquelesdernie`restechniquespourpre´voirleurmayhaveservicelivesthatrangefromlessthanadecadeperformance.Noussavonsquelessyste`mesprimairestomorethanacentury,dependingonthedes

4、igndetails,decollectionauleachatepeuventavoirdesviesutileswastecharacteristicsandmodeofoperation.Recentdataallantd’a`peinedixansa`plusd’unsie`cle,selonleurindicatethatlandfilllinertemperaturescanbeexpectedconception,lescaracte´ristiquesdesde´chetsetlesmodestoreachatleast

5、30–408Cfornormallandfilloperations.d’exploitation.Desdonne´esre´centesindiquentquelesWithrecirculationofleachatethelinertemperaturein-tempe´raturesdesdoublurespeuventatteindreentre30creasesfasterthanundernormaloperatingconditions,et408Cpourlessitesnormaux.Aveclarecircula

6、tionduandmaybeexpectedtoexceed408C.Temperatures(uptoleachate,latempe´raturedeladoublureaugmenteplus40–608C)mayoccuratthebaseoflandfillswherethereisvitequ’enconditionsd’exploitationnormalesetelleasignificantleachatemound.Temperatureisshowntopeutmeˆmede´passerles408C.Lestem

7、pe´raturespeuventhaveasignificantimpactonbothcontaminantmigrationatteindrejusqu’a`40–608Ca`labasedesde´chargesla`andtheservicelifeofthelinersystem.Fieldmeasure-ou`setrouveuneaccumulationsignificativedeleachate.mentsandtheoreticalcalculationsshowthatcompositeNousmontronsqu

8、elatempe´ratureaunimpactsignifi-linersaresubstantiallybetterthansinglelinersintermscatifsurlamigrationdescontam