不同喷淋量对核废物处置库顶盖毛细屏障效应的实验研究

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1、霍丽娟等不同喷淋量对核废物处置库顶盖毛细屏障效应的实验研究不同喷淋量对核废物处置库顶盖毛细屏障效应的实验研究*霍丽娟钱天伟丁庆伟李一菲杨国义Ck原科技大学环境科学研究所，山西太原030024)摘要采用箱体实验方法，通过对粗一细砂交界面水分穿透量和绕流量的定量观测以及基质势的测定，模拟降雨条件，探讨了喷淋量分别为5、lO、15、20、25mm／d时对核废物处置库顶盖(粗一细砂交界面)毛细屏障效应的影响。基质势的测定结果表明，在没有达到粗砂进水基质吸力之前，水分在粗一细砂交界面累积量增加并未及时发生横向流动；当交界面的基质吸力达到进水基质吸力后，穿透发生；此后交界面的基质势又很快减小，水分主要发生

2、横向绕流。随着喷淋量的增大，对于粗一细砂交界面，无论是喷淋期间基质势的增加程度还是喷淋结束后基质势的降低程度都很明显；相比较而言，细砂层的基质势变化很小。水分相对绕流量测定结果表明，喷淋景不大于5mra／d时，不会发生穿透；随着喷淋量的增大，通过粗一细砂交界面的穿透量逐渐增大，而横向绕流量随之减小，当喷淋量达到25mm／d时，水分相对绕流量减少至39．7。关键词喷淋量毛细屏障基质势绕流穿透Anexperimentalinvestigationontheimpactofinfiltrationrateoncapillarybrriersincoversofradioactivewastesdis

3、posalfacilitiesHUOLijuan，QIANTianwei，DINGQingwei，Lf，YANGGuoyi．(InstituteofEnvironmentalSci—ence，TaiyuanUniversityofScienceandTechnology，TaiyuanShanxi030024)Abstract：Atypicalconfigurationofcappingsystemsforradioactivewastedisposalfacilitiesiscoarsermateriallayerunderlyingafinermateriallayer．Seriesofi

4、nfiltrationtestsunderdifferentinfiltrationrate(5，10，15，20and25mm／d)wereconductedinabox-shapecappingsystemstosimulatetherainfallswithdifferentintensity．Thebreak—throughquantityandlateraldrainageinthefine—coarseinterfacewerequantitativeanalyzedtOinvestigatetheimpactofinfiltrationstrengthoncapillarybar

5、rierformedbyfineandcoarsequartzsandlayers．Matricpotentialshowedthatthemoistureinthecoarse-fineinterfaeeaccumulatedandnotransverseflowfoundbeforethematrixsuctionreachtotheinfluentsuctionofcoarsesandlayer，afterthen，breakthroughflowoccurredandmatricpotentialofcoarse—fineinter—facedecreasedquickly．Withi

6、ncreasingtheinfiltrationrate，theincreasingdegreeofmatricpotentialincoarse-finein—terraceduringinfiltrationprocessgettingmoreandmoreobvious，aswellasthedecreasingdegreeofmatricpotentialafterinfiltrationprocess．Incomparison，thevariationofmatricpotentialinfinerlayerwasrelativelysmal1．Lateraldrainagedete

7、ctionshowedthatthebreakthroughflowwouldnothappenedwheninfiltrationratelessthan5mm／d．Thewaterpenetratedthroughthecoarse-fineinterfacewasincreasedwithincreasingtheinfiltrationstrength，andlat—eraldrainag