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《宜万线隧道洞口滑坍分析与治理(铁道工程学报20071121)》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、宜万线隧道洞口滑坍分析与治理张民庆1,2,黄鸿健2,苗德海3,田四明3(1.中铁隧道集团科研所,河南洛阳471009;2.宜万铁路建设总指挥部,湖北恩施445000;3.铁道第四勘察设计院,湖北武汉430063)摘要:研究目的:宜万线全线共有隧道159座,洞口150处,施工过程中有9处洞口发生了滑坍,通过对滑坍原因分析和滑坍治理,为类似工程提供借鉴。研究方法:介绍了9处洞口的滑坍情况,对滑坍原因进行分类,并根据地质情况进行滑坍治理。研究结果:隧道洞口滑坍与地质原因、设计原因、施工原因有关,对滑坍治理应根据地质条件采取不同的治理方案。研究结论:隧道洞口发生滑坍除地质原因外,勘察资料不准确和不能
2、及时进行方案完善是设计的主要原因,未按设计施工、未及时提出变更、施工方法不当、监控量测不及时是施工的主要原因。针对隧道洞口滑坍,应对洞口段进行有效的治理,当软弱不良地层厚度不大于5m时,可采取加强锚网喷防护;当大于5m、小于10m时,应采取钢管桩注浆加固;当大于10m时,应增设抗滑桩,以取得稳妥的治理效果。同时,应及时施做明洞、洞门,以及洞口段的二次衬砌。关键词:宜万铁路;隧道洞口;滑坍;治理作者简介:张民庆(1970–),男,河南孟县人,高级工程师,从事隧道及地下工程监控量测、注浆防水的科研、设计和施工。地址:湖北省恩施市东风大道503号宜万总指,邮编445000,电子信箱zskzmq88
3、8@163.com,电话:13972436278AnalyseandtreatmentofthesloughinginYichang-WanzhourailwaytunnelportalZHANGMing-qing1、2,HUANGHong-jian2,MIAODe-hai3,TIANSi-ming3(1.ScienceandTechnologyResearchInstituteunderChinaRailwayTunnelgroupo.Ltd.,HenanUnirersity,Luoyang471009,China;2.Yiwangconstructionheadquartersofthe
4、managingofworksoftherailwayministry,HubeiUniversity,Enshi445000,China;3.Thefourthsurvey&designinstituteofchinarailway,HubeiUniversity,Wuhan430063,China.)Abstract:Researchpurposes:Yichang-Wanzhourailwayhave159tunnelsand150tunnelportals,9tunnelportalshappensloughingintheconstruction.Givetheusetothesi
5、milarconstructionthroughanalysethesloughingreasonandtreatment.Researchmethods:Introducethe9tunnelportalssloughing,sortthesloughingreason,treatmentthesloughingaccordingtothegeology.Researchresults:Thesloughingofthetunnelportalisrelatetothegeologyanddesignandconstruction.Sloughingtreatmentisdifferent
6、accordingtothedifferentgeology.Researchconclusions:Thesloughingofthetunnelportalisnotonlyrelatetothegeologyreason,butalsotheunfaithfulreconnaissanceandnottimelychangingprojectistheprimarydesignreasons.Notconstructaccordingtothedesignandnottimelyadvancechangingprojectandfalseconstructionmethodandnot
7、timelymonitoringistheprimaryconstructionreasons.Fortakingthegoodtreatmenteffecttothesloughingofthetunnelportal,taketheanchorboltandsteelgriddingandspurtconcreteifthethicknessofthesoftrocklessandequalthan5me