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1、第35卷第9期岩土力学Vol.35No.92014年9月RockandSoilMechanicsSep.2014文章编号:1000-7598(2014)09-2529-06两种塑料排水板滤膜淤堵特性试验研究1123乐超,徐超,吴雪峰,金亚伟(1.同济大学岩土及地下工程教育部重点实验室,上海200092;2.上海市政工程设计研究总院(集团)有限公司,上海200092;3.江苏鑫泰岩土科技有限公司,江苏宜兴214267)摘要:在水力梯度逐级递增的条件下,采用饱和软黏土进行了两种不同塑料排水板(PVD)滤膜(外包土工织物)梯度比试验,
2、探讨两种PVD滤膜的淤堵特性,并结合真空预压软基加固的实际工况进行分析。试验结果显示,随着水力梯度的递增,一种表观孔径大的新工艺PVD滤膜的梯度比呈现先上升后下降的总趋势,并最终趋于稳定,常规PVD滤膜的梯度比总体呈上升趋势,无法趋于稳定。研究表明,不同水力梯度对滤膜淤堵有着较大影响,新工艺PVD滤膜在真空预压实际工况(水力梯度较高)下的防淤堵效果优于常规PVD滤膜。PVD滤膜的淤堵问题与滤膜制作工艺、孔径和软黏土性质有关,其淤堵机制仍需进一步的研究。关键词:真空预压;饱和软黏土;PVD滤膜;梯度比试验;水力梯度中图分类号:TU
3、411文献标识码:AExperimentalresearchoncloggingcharacteristicoftwotypesofPVDfilters1123LEChao,XUChao,WUXue-feng,JINYa-wei(1.KeyLaboratoryofGeotechnicalandUndergroundEngineeringLaboratoryofMinistryofEducation,TongjiUniversity,Shanghai200092,China;2.ShanghaiMunicipalEngineeri
4、ngDesignInstitute(Group)Co.,Ltd.,Shanghai,200092,China;3.XintaiGeotechnicalTechnologyCo.,Ltd.,Yixing,Jiangsu214267,China)Abstract:Gradientratiotestsoftwokindsofplasticverticaldrain(PVD)filters(wrappedgeotextile)arecarriedoutundertheconditionofhydraulicgradientincreas
5、edstepbystepintheenvironmentofsaturatedsoftclay.Combinedwithactualvacuumpreloadingworkingconditionsofsoftfoundationtreatment,thecloggingcharacteristicsoftwokindsofPVDfiltersareanalyzed.Experimentalresultsshowthat,withincreasinghydraulicgradient,gradientratiooftheanti
6、-cloggingeffectofthenewPVDfilterwithlargerapparentopeningsizeshowsupwardtrendfirstly,thendownwardtrend,eventuallystability,whilegradientratioofthetraditionalPVDfiltershowsupwardallthetimeandisunabletostabilize.Researchresultsshowthatdifferenthydraulicgradientshaveagr
7、eatinfluenceonthecloggingfeaturesofthePVDfilters;andthenewPVDfilterisbetterthanthatofthetraditionaloneinactualvacuumpreloadingworkingconditions(thehydraulicgradientishigh).ThecloggingofPVDfiltersrelatestotheproductiontechnology,poresizeofthefilterandcharacteristicofs
8、oftclay;itisrequiredtodeepentheresearchofthecloggingmechanismoffilters.Keywords:vacuumpreloading;saturatedsoftclay;PVD(plasticverti