外文翻译

Journal of Industrial Textiles

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Optimization of Parameters for the Production of Needlepunched

Nonwoven Geotextiles

Amit Rawal, Subhash Anand and Tahir Shah

2008 37: 341Journal of Industrial Textiles

DOI: 10.1177/1528083707081594

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OptimizationofParametersfor

theProductionofNeedlepunched

NonwovenGeotextiles

AMIT RAWAL,* SUBHASH ANAND

AND

TAHIR SHAH

TheUniversityofBolton,DeaneRoad

Bolton,BL35AB,UK

ABSTRACT: Needlepunchednonwovengeotextilesarewidelyusedforvariouscivil engineeringapplications.Theseapplicationsarerequiredtoperformmorethanone function,i.e.,filtration,separation,protection,drainage,andreinforcement. Reinforcementisacomplexphenomenonandstronglydependsuponthefabric dimensionalandmechanicalpropertiesinadditiontothesoilCgeotextileinteraction Inthisstudy,theeffectofprocessparametersincludingwebareadensity,punch density,anddepthofneedlepenetrationhasbeeninvestigatedondimensional (areadensityandthickness)andmechanical(punctureresistanceandtensile strengthsinthemachineandcross-machinedirections)propertiesofneedlepunched nonwovengeotextiles.Theseprocessparametersarethenempiricallyrelatedwiththe fabricpropertiesusingmultipleregressiontechnique.Theanisotropiccharacteristics ofneedlepunchednonwovengeotextilestensilepropertieshavealsobeendiscussed. KEYWORDS: geotextiles,needlepunchednonwoven,tensile,dimensional, mechanical,punctureresistance.

INTRODUCTION EEDLEPUNCHEDNONWOVENGEOTEXTILES arewidelyusedforvarious civilengineeringapplicationsincludingroadandrailwayconstruction,

N

*Authortowhomcorrespondenceshouldbeaddressed.

E-mail:amitrawal77@,amitrawal77@ Figures1C12appearincoloronline:http://jit.sagepub.co

341

JOURNALOF INDUSTRIALTEXTILES, Vol.37,No.4!aApril200

1528-0837/08/040341C16$10.00/0DOI:10.1177/152808********* SAGEPublications2008

LosAngeles,London,NewDelhiandSingaporeDownloaded from

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A.RAWALETAL.

landfills,slopestabilization,etc.Suchapplicationsrequirecertainfunctional characteristicsinthestructure,besidesbasicproperties,whicharerequired tobeengineeredbyjudiciousoptimizationoftheneedlepunchingprocess. Theseapplicationsarerequiredtoperformmorethanonefunction,

i.e.,filtration,separation,protection,drainage,andreinforcement. Anexampleofusingnonwovengeotextilesasreinforcementincludesslope stabilizationinwhichthestabilityoftheslopedependsonthestressesthat thegeotextilecansustainandtransmittheloadswithinthenonwoven structure.Theprincipleofusinggeotextilesasreinforcementistointroduce thegeotextilesintothesoilstructurethatincreasethecohesionbetweenthe grains[1].Thismodifiesthetransmissionoftheloadandtheresulting compositeisabletosustainhigherloads.Theforcesexertedonthestructure asaresultofvariousloadsaretransferredintotensilestresseswhichfurther influencesothermechanicalproperties,suchaspunctureresistance[2]. Thereinforcementisacomplexphenomenonandresultsfromthecombined behaviorofsoilCgeotextileinteractions[3C5].However,theperforman characteristicsofgeotextilesarestronglydependentuponraw-material, manufacturingprocess,anditsrelatedparametersthatalsoinfluencethe structuralmechanicsofthefabrics.Thereareseveralmaterialandprocess parameters(fiber,web,needle,needlepunching,andfinishing)thatcan