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时间:2019-05-23
《双面加筋土高挡墙的离心模型试验》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第24卷第3期岩石力学与工程学报Vol.24No.32005年2月ChineseJournalofRockMechanicsandEngineeringFeb.,2005双面加筋土高挡墙的离心模型试验雷胜友(长安大学公路学院岩土所,陕西西安710064)摘要:在离心机上进行30.0~62.5m的双面加筋土高挡墙模型试验。模型组数为34组,模型分为设置错台和不设置错台2种情况,压实系数分别取0.80和0.90。试验表明,对于填土的压实系数为0.90的情况,无论设置错台与否,模拟的挡墙的最大直立高度可
2、达62.5m;对于填土压实系数为0.80的情况,当不设错台时,模拟的挡墙高度可达30.0m,当设错台时,模拟的挡墙高度可达33.0m。挡墙的破裂面线开始于墙脚或设置错台处,当达到顶部时,距挡墙面板的距离为挡墙高度的0.169倍,其在顶部的范围为挡墙高度的0.08~0.35倍。破裂面线为对数螺旋曲线。挡墙施工完毕后,其侧向位移的发展已基本完成,且数值很小。墙后填土侧向压力的分布为:沿着墙高自上而下变化,在上部大约4cm以上的范围内,其值接近主动土压力;而在上部4cm以下的范围内,其值基本上在主动土压
3、力线之内,有个别点的值介于主动土压力与静止土压力之间。竖向土压力的分布基本上同侧向压力的分布有相似的规律性。所得结果对工程设计有指导意义。关键词:土力学;双面加筋土高挡墙;离心加载;相似材料中图分类号:TU411文献标识码:A文章编号:1000–6915(2005)03–0417–07CENTRIFUGALMODELLINGOFHIGHDOUBLE-FACEREINFORCEDEARTHRETAININGWALLLEISheng-you(GeotechnicalInstituteofHighway
4、School,Chang′anUniversity,Xi′an710064,China)Abstract:Double-facereinforcedearthretainingwallsof30.0~62.5mhigharemodelledincentrifuge.Thenumberofmodelsis34.Inthetests,themaximumheightoftheretainingwall,thevariationoflateralearthpressure,theverticaleart
5、hpressureandtheshapeoffailureplanearedetermined.Theexperimentsshowthatwhenthecompactingfactoris0.90,themaximumheightoftheretainingwallwithorwithoutstepsis62.5m,andwhenthecompactingfactoris0.80,theheightoftheretainingwallwithstepsis33.0mandthatwithouts
6、tepsis30.0m.Failuresurfacebeginsatthefootoftheearthretainingwall.Whenitarrivesatthetopofthebackfill,thedistancefromthefailuresurfacetothefacingwallis0.169timesthewallheight.Thefailurewidthis(0.08~0.35)timesthewallheightonthetop.Thefailureenvelopeisalo
7、g-spiral.Whentheconstructioniscompleted,thelateraldisplacementsofthewallsarealmostfinishedwithsmallvalues.Thelateralearthpressurechangesalongtheretainingwall.Intheregion4cmfarfromthetopofbackfill,thelateralearthpressureisnearactiveearthpressure,whileu
8、ndertheregion,itissmallerthantheactiveearthpressureandonlyafewpointsarebetweenearthpressureatrestandactiveearthpressure.Theverticalearthpressurehasthesimilardistributionasthatoflateralearthpressure.Theobtainedresultscanofferreferencestoenginee
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