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1、大断面隧道浅埋段采用盖挖法施工的适用条件探讨唐红宁云桂铁路云南有限责任公司昆明650200摘要文章通过实例介绍,总结了铁路双线大断面隧道浅埋段采用盖挖法施工的关键技术,对大断面隧道浅埋段采用盖挖法施工的适用条件进行了探讨,提出在交通、环境等外部施工条件具备时,在一般地层隧道覆跨比为0.4~0.6的超浅埋段,岩溶洼地覆跨比为0.6~1.0的浅埋段可考虑采用盖挖法替代浅埋暗挖法施工。关键词盖挖法浅埋暗挖隧道覆跨比1.前言地下结构的施工通常可分为开槽明挖法、暗挖法、半明挖法三大类。盖挖法,是由地面向下
2、开挖至一定深度后,先修筑地下结构的顶板、然后在顶板的遮护下安全、顺利地修建地下结构其他部分的半明挖施工方法的通称[1]。因其在20世纪50年代的意大利米兰地铁的区间隧道和车站工程中取得了成功,曾被称为“米兰法”、“布鲁塞尔法”。盖挖法的实质是一种半明挖法,兼有明挖与暗挖法的优点[2],适用于埋深较浅的地下工程施工。20世纪80年代以后,盖挖法在我国市政工程、地铁等领域得到了广泛应用,近年来在铁路和公路隧道施工中也被灵活运用,为浅埋隧道施工安全、施工进度提供了有效的技术手段。2.盖挖法在铁路双线大
3、断面隧道浅埋段应用实例云桂铁路(云南段)在石林隧道、老笑一号隧道浅埋地段分别采用了有边桩(墙)及无边桩(墙)两种盖挖法进行施工。urbanarea2.5.2YibincityinYibincity,accordingtoresourceandenvironmentcharacteristicsUrbanpopulationandurbanspatialdistribution,spatialdistributionofindustries,majorinfrastructureCorridorl
4、ayout,combinedwiththefuturedevelopmenttrendofsyntheticjudgments,planning,urbanspatialstructureofurbansystemcanbesummarizedas:"apolealongthetwoaxes"."A"referstothemetropolitanareaalongtheYangtzeRiver,isthecoreareaofthedevelopmentofthecity.Planstobuild
5、fortheYangtzeRivereconomicbeltonthepillar,advancingalongthe...GuangheRiver,Yiliang,prestigeoftheexternalcohesionofzhaotong,Yunnan,internalconnectingYibincitytotheNorth.TheSichuan-Yunnan-GuizhouborderareaofYibin,inthecityofzhaotong,liupanshuithree,zha
6、otongcity,themostpopulousandmostextensiveregions,themosteconomicallybackward,totheNorthinWumengmountainareaofyanjin,shuifu,suijiangcountiesradiationpowerisrelativelyweak.Yibincityandinfrastructureinsuchareasshouldbestrengthenedanddocking,extendingsou
7、thwardtopublicservices,promotethedevelopmentofmineralresourcesinNortheastYunnan,expandoureconomichinterland,drivingsynchronousliftinginSichuan-Yunnan-Guizhouborderarea.Thisurbanaxiswithmineralresourceadvantages,focusonthedevelopmentofadvancedtechnolo
8、gy,comprehensiveutilizationofresourcesofhigherenergy,newbuildingmaterials,chemicalindustry,developingnewenergyandminingtowns.Urbanspaceorganization-ingongxianCounty,Gao,junlianCountyCenterforareaorganizations,improve,Gao,Gong,junlianCountycomprehensi