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时间:2019-02-04
《隧道围岩-喷射混凝土界面应力解析》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、学兔兔www.xuetutu.com第34卷第6期JournalofCivil,Architectural&EnvironmentalEngineering土木建筑与环境工程Vo1.34NO.62O12年12月Dec.2O12doi:10.3969/j.issn.1674—4764.2012.06.012隧道围岩一喷射混凝土界面应力解析文竞舟h,张永兴h,王成(1.重庆大学a.土木工程学院;b.山地城镇建设与新技术教育部重点实验室,重庆400045;2.重庆交通大学隧道及岩土工程系,重庆400074)摘要:根据喷射混凝土
2、支护隧道围岩的界面力学特点,考虑喷层与围岩结合界面受力和变形协调关系,并结合围岩承载拱效应,建立了围岩一喷层结构的复合曲梁共同承载模型,然后通过各微单元静力平衡推导复合曲梁的径向位移的控制微分方程,得到任意分布荷载作用下喷层与围岩界面应力以及喷层与围岩各自内力的解析式,可迅速获取喷层与围岩结合界面的力学状况,进而判断围岩稳定性与预测安全性,为隧道施工决策提供技术支撑。最后经隧道台阶法开挖的算例研究表明,喷层支护通过其与围岩的结合界面上传递应力使围岩内部形成压应力带,有利于围岩的稳定。关键词:隧道工程;喷射混凝土支护;围岩
3、承载拱;界面应力;复合曲梁中图分类号:TU443文献标志码:A文章编号:1674—4764(2012)06-0067—08AnalysisonInterfacialStressBetweenSurroundingRockandShotcreteLiningWENJingzhou。,.ZHANGYongxing。,.WANGCheng(1a.CollegeofCivilEngineering;lb.KeyLaboratoryofNewTechnologyforConstructionofCitiesinMountainAr
4、ea,MinistryofEducation,ChongqingUniversity,Chongqing400045,P.R.China;2.DepartmentofTunnelandGeotechnicalEngineering,ChongqingJiaotongUniversity,Chongqing400074,P.R.China)Abstract:Accordingtothecharacteristicsofinterfacialstressbetweensurroundingrockandshotcretesu
5、pport,mechanicalmodelofcompositecurvedbeameforsupportsystemoftunnelsurroundingrockandshotcreteliningwasestablished,consideringtheinterfacialdeformationcoordinationandtheeffectsofbearingarchofsurroundingrock.Thenfromstaticequilibriumoftwodifferentialelements,thedi
6、fferentialequationsfortheradialdisplacementofcompositecurvedbeamwereobtained.Allanalyticformulasofbothinterracialstressandinternalforcesbetweensurroundingrockandshotcreteliningbyarbitrarydistributionloadwerederived.Andthusthemechanicalconditionofinterfacezoneandt
7、hestressconcentrationpositionwereobtained,whichisconvenienttoassessthestabilityofsurroundingrockandpredictthesafety.Finally,theanalysisoftunnelprojectexcavatedbybenchmethodshowedthatshotcreteliningmadetheformationofcompressivestresszoneinsurroundingrockbytransfer
8、ringstressfromtheinterfacebetweensurroundingrockandshotcrete,whichisbeneficialtoimprovethestabilityofsurroundingrock.Keywords:tunnelengineering;shotcretelining
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