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1、第33卷第4期铁道学报Vol33No42011年4月JOURNALOFTHECHINARAILWAYSOCIETYApril2011文章编号:10018360(2011)04008409湿陷性黄土桩网复合地基沉降控制离心模型试验1121王长丹,王炳龙,王旭,周顺华(1同济大学道路与交通工程教育部重点实验室,上海201804;2兰州交通大学土木工程学院,甘肃兰州730070)摘要:为研究和分析高速铁路荷载作用下刚性桩桩网复合地基控制湿陷性黄土地基沉降的效应,采用离心模型试验
2、的方法对不同桩间距设置条件下的刚性桩桩网复合地基进行了模拟试验。试验研究表明:湿陷性黄土地基无法满足高速铁路有砟轨道对路基工后沉降的要求,需要加固处理;随着桩间距由2倍桩径增至6倍桩径,地基工后沉降量增大,差异沉降量增大,桩土荷载应力分担比增大,桩间土对桩体的负摩阻力增大;桩帽的设置可以有效地控制地基工后沉降量和沉降速率,减小差异沉降;桩间土与桩体相对位移中性点位置随着桩间距的增大而显著降低;桩体刺入垫层量值会随桩间距增大在施工阶段显著增加,而在工后阶段呈减少趋势。关键词:路基工程;湿陷性黄土;刚性桩;桩网复合地
3、基;离心模型试验;沉降中图分类号:TU41193;U21315文献标志码:Adoi:103969/j.issn.10018360.2011.04.013AnalysisonSettlementControllingEffectofpilenetCompositeFoundationonCollapsibleLoessbyCentrifugalModelTests1121WANGChangdan,WANGBinglong,WANGXu,ZHOUShunhua(1KeyLaborato
4、ryofRoadandTrafficEngineeringoftheMinistryofEducation,TongjiUniversity,Shanghai201804,China;2SchoolofCivilEngineering,LanzhouJiaotongUniversity,Lanzhou730070,China)Abstract:Onthebasisofalreadyconductedexperimentalstudyathomeandabroad,thecentrifugalmodeltest
5、isusedtoimitatethepilenetcompositefoundatonwithdifferentpilespacingsoastostudythesettlementcontrollingabilityofthepilenetcompositefoundationoncollapsibleloessgroundTheresearchresultsshowasfollows:Thecollapsibleloessgroundcannotmeettherequirementsofsettlem
6、entafterconstructionofballastedtracksofhighspeedrailwaysanditneedstobereinforced;thesettlementafterconstruction,differentialsettlement,pilesoilloadshareratioandnegativeskinfrictionofthepilegetlargerwithextendingofpilespacingbytwotosixtimesofthepilediameter
7、;Settlement&settlementrateafterconstructioncanbecontrolledeffectivelyanddifferentialsettlementcanbereducedbysettingofthepilecap;theneutralpointoftherelativedisplacementbetweenthepileandinterpilesoildropsobviouslywithextendingofpilespacing;thevalueoftherel
8、ativedisplacementbetweenthepileandcushionincreaseswithextendingofpilespacingintheconstructionstageanddecreasesafterconstructionKeywords:subgradeengineering;collapsibleloess;rigidpile;pil
