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时间:2019-05-28
《隧道洞口浅埋段管棚超前支护开挖进尺优化_满帅》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、DOI:10.13238/j.issn.1004-2954.2013.10.028·隧道/地下工程·隧道洞口浅埋段管棚超前支护开挖进尺优化112满帅,孔超,王海彦(1.西南交通大学交通隧道工程教育部重点试验室,西南交通大学土木工程学院,成都610031;2.石家庄铁路职业技术学院,石家庄050041)摘要:山岭隧道矿山法施工循环作业的开挖进尺对该隧道工程局部乃至整体的施工安全性、经济性有着重大影响。针对使用管棚超前支护的隧道洞口浅埋段,采用Winkler弹性地基梁计算模型,以管棚钢管挠度为控制条件进行开挖进尺优化分析。以厦深高速铁路某双线隧道工程为依托,首先进行理
2、论计算,同时考虑工程实际确定最优开挖进尺并指导施工,随后将现场实测数据与理论解析值对比,两者有较好的一致性。结果表明,Winkler弹性地基梁计算模型可以较真实地反映管棚在洞口浅埋段软弱破碎围岩中的力学行为。关键词:铁路隧道;管棚超前支护;Winkler弹性地基梁;开挖进尺优化中图分类号:U456文献标识码:A文章编号:1004-2954(2013)10-0108-04OptimizationofExcavationFootageofShallowly-buriedSectionofTunnelPortalSupportedbyAdvancePipeRoof112
3、MANShuai,KONGChao,WANGHai-yan(1.MOEKeyLaboratoryofTransportationTunnelEngineering,SouthwestJiaotongUniversity;SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China;2.ShijiazhuangInstituteofRailwayTechnology,Shijiazhuang050041,China)Abstract:Formountaintunnelsconstru
4、ctedbyminingmethod,theexcavationfootageofoneoperationcyclehassignificantinfluenceonlocalandevenoverallconstructionsafetyandeconomicefficiency.Aimingattheshallow-buriedsectionoftunnelportalsupportedbyadvancepiperoof,usingWinklerelasticfoundationbeammodel,andtakingthedeflectionofsteelpi
5、peofthepiperoofasthecontrollingcondition,theexcavationfootagewasoptimizedandanalyzed.Meanwhile,citingadoubletracktunnelonXiamen-ShenzhenHigh-speedRailwayasanexample,thetheoreticaloptimalexcavationfootagewascalculated,andatthesametimetheactualsituationofthetunnelprojectwastakenintoacco
6、unttodeterminetheoptimalexcavationfootagesoastoguidetheconstruction.Subsequently,bycomparingthefieldtestvaluewiththetheoreticalanalysisvalue,itcanbeseenthatthereisagoodconformitybetweenthetwovalues,whichprovesthattheWinklerelasticfoundationbeammodelcantrulyreflectthemechanicalbehavior
7、ofthepiperoofintheweakandfracturedsurroundingrocksattheshallow-buriedsectionoftunnelportal.Keywords:railwaytunnel;advancesupportbypiperoof;Winklerelasticfoundationbeam;optimizationofexcavationfootage有效抑制隧道洞口崩塌、保证拱顶稳定,控制围岩先行1概述位移和地表下沉。由于其可靠性高,该技术已经在各管棚超前支护技术指在开挖前沿隧道外轮廓打设种复杂、软弱地质条件下的隧道工
8、程中得到广
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