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1、第36卷第6期岩土力学Vol.36No.62015年6月RockandSoilMechanicsJun.2015DOI：10.16285/j.rsm.2015.06.012等双轴拉应变对无纺土工织物孔径变化的影响111,23白彬，唐晓武，唐琳，曲绍兴（1.浙江大学滨海和城市岩土工程研究中心，浙江杭州310058；2.哈尔并工业大学（威海），山东威海264209；3.浙江大学航空航天学院工程力学系，浙江杭州310027）摘要：无纺土工织物作为一种反滤材料，在工程中常受土体作用产生平面双轴拉应变，导致织物孔径变化。基于无纺织物空间网络孔径模型，改进Rawal公式中织物孔径结构总层数的
2、算法，并提出等双轴拉伸下织物孔径分布曲线的解析解。利用自主研发的双轴拉伸仪，将两种针刺无纺织物等双轴拉伸至应变为3%、5%、10%，采用应变控制下的干筛法，进行织物孔径分布曲线测试。将解析解与试验结果进行对比分析，解析解孔径值偏大，所得解析曲线与测试曲线对于较薄织物吻合更好。研究结果表明，随着双轴拉应变的增加，无纺织物孔径增大，其特征孔径O95、O50、O30都近似与拉伸应变呈线性变化关系。关键词：双轴拉应变；无纺土工织物；解析解；孔径分布曲线；干筛法中图分类号：TU411文献标识码：A文章编号：1000－7598(2015)06－1615－08Influenceofequalb
3、iaxialtensiononopeningsizesofnonwovengeotextiles111,23BAIBin，TANGXiao-wu，TANGLin，QUShao-xing(1.ResearchCenterofCoastalandUrbanGeotechnicalEngineering,ZhejiangUniversity,Hangzhou,Zhejiang310058,China;2.HarbinInstituteofTechnologyatWeihai,Weihai,Shandong264209,China;3.DepartmentofEngineeringMec
4、hanics,ZhejiangUniversity,Hangzhou,Zhejiang310027,China)Abstract:Nonwovengeotextileisusedinengineeringasfiltermaterials.Whenthegeotextileissubjectedtobiaxialtension,theporesizeofgeotextilecanbechanged.Basedona3Dporenetworkmodelforthenonwovengeotextile,themethodforcalculatingthenumberofstructu
5、rallayersinRawal’sformulationisimprovedandatheoreticalsolutionisproposedfortheporesizedistributionofnonwovensunderequalbiaxialtension.Twogeotextilesareuniformlystretchedinbi-directionstostrainsof3%,5%and10%,respectively,usingaself-developedbi-directionallystretchingmachine,andthepore-sizedist
6、ributionsofthestretchedgeotextilesaredeterminedunderstrain-controlledconditionusingthedrysievingmethod.Bycomparingthetheoreticalsolutionsandthemeasurements,itisshownthatthetheoreticalmethodoverestimatestheporesizes,andyieldsmorereasonableresultsforthethinnergeotextiles.Inaddition,theporesizes
7、increasewiththebiaxialtensilestrain，andthecharacteristicopeningsizeO95,O50,andO30increaseapproximatelylinearlywiththetensilestrain.Keywords:biaxialtensilestrain;nonwovengeotextiles;analyticalsolutionofpore;poresizedistributioncurve;drysieving
