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1、第33卷第1期公路交通技术Vol.33No．12017年2月TechnologyofHighwayandTransportFeb．2017DOI:10．13607/j.cnki.gljt.2017．01．001加筋土中土工格栅布置方式优化分析熊尚阳(中铁十一局集团第一工程有限公司,湖北襄阳441104)摘要:利用数值模拟研究软粘土地基加筋土土工格栅最优布置方式,着重研究首层格栅埋置深度、格栅间距、格栅层数以及格栅长度对加筋土极限承载力的影响。通过逐渐增大基础表面荷载获得荷载-位移曲线,根据曲线拐点确定地基极限承载力。研究结果表明:地基承载力随首层格栅埋置深度增加呈
2、现先增大后减小的趋势,当首层格栅埋置深度为0．2B时,地基承载力达到峰值;格栅间距小于0．25B时,地基承载力随格栅间距增大而增大,当其大于0．25B时,地基承载力随格栅间距增大而迅速减小;地基承载力随格栅层数增加均有所提高,但当其大于4层时,地基承载力增大速率明显降低;格栅长度小于2．0B时,地基承载力随其增大而显著增大,格栅长度大于2．0B时,格栅长度增加引起的地基承载力增大较小。关键词:加筋土;土工格栅;地基承载力;数值模拟文章编号:1009-6477(2017)01-0001-05中图分类号:U416．1文献标识码:AAnalysistoGeogridAr
3、rangementOptimizationinReinforcedSoilXIONGShangyangAbstract:Thispaperusesnumericsimulationtostudytheoptimizedarrangementofgeogridinreinforcedsoilofsoftclayfoundation.Thestudyfocusedoninfluencetomaximumbearingcapacityofreinforcedsoilbyfirstlayergeogridburieddepth,geogriddistance,geogri
4、dlayersandgeogridlength.Obtainload-displacementcurvebygraduallyincreasingfoundationsurfaceload,sotodetermineultimatebearingcapacityoffoundationaccordingtoturningpointoncurve.Resultsshow:Thefoundationbearingcapability,withtheincreasingoffirstlayergeogridburieddepth,appearstobethetrendo
5、fincreasingandthenreducing.Thefoundationbearingcapabilityreachespeakvaluewhenthefirstlayergeogridburieddepthis0．2B.Whengeogriddistanceislessthan0．25B,thefoundationbearingcapabilityincreaseswiththeincreasingofgeogriddistance,whengeogriddistancelargerthan0．25B,thefoundationbearingcapabi
6、lityreducesharplywiththeincreasingofgeogriddistance;Thefoundationbearingcapabilityincreaseswiththeincreasingofgeogridlayernumbers,butwhenthelayernumberexceeds4,theincrementoffoundationbearingcapabilitylowersdownobviously.Whenthegeogridlengthislessthan2．0B,thefoundationbearingforceincr
7、easesobviouslywithgeogridlengthincrement,whilewhenthegeogridlengthisover2．0B,theincrementoffoundationbearingcapabilitywiththegeogridlengthincrementisrelativelysmall.Keywords:reinforcedsoil;geogrid;foundationbearingcapability;numericsimulation[1-5][6]近年来,加筋土被广泛应用于土木工程的各个作性能进行了试验研究。例如,B
8、inque
