铁道建筑技术
鐵道建築技術
철도건축기술
RAILWAY CONSTRUCTION TECHNOLOGY
2014年
11期
49-52
,共4页
隧道洞口%受力分析%零刷坡%方案选择
隧道洞口%受力分析%零刷坡%方案選擇
수도동구%수력분석%령쇄파%방안선택
tunnel entrance%stress analysis%zero slope%scheme selection
当前隧道施工倡导“零刷坡”进洞理念，洞口仰坡尽量避免大挖大刷，在减少施工工作量和难度的同时，较好地保护环境。用库仑理论对洞口受力进行分析，并以此为依据确定进洞采用大管棚还是小导管。洞口地段的施作关键点在于限制初期支护的变形，同时应控制掌子面、仰拱、二衬间的安全步距，及早封闭成环，仰拱和衬砌紧跟。
噹前隧道施工倡導“零刷坡”進洞理唸，洞口仰坡儘量避免大挖大刷，在減少施工工作量和難度的同時，較好地保護環境。用庫崙理論對洞口受力進行分析，併以此為依據確定進洞採用大管棚還是小導管。洞口地段的施作關鍵點在于限製初期支護的變形，同時應控製掌子麵、仰拱、二襯間的安全步距，及早封閉成環，仰拱和襯砌緊跟。
당전수도시공창도“령쇄파”진동이념，동구앙파진량피면대알대쇄，재감소시공공작량화난도적동시，교호지보호배경。용고륜이론대동구수력진행분석，병이차위의거학정진동채용대관붕환시소도관。동구지단적시작관건점재우한제초기지호적변형，동시응공제장자면、앙공、이츤간적안전보거，급조봉폐성배，앙공화츤체긴근。
Currently,“zero slope”is advocated in tunnel construction to avoid the excessive excavation and large slope cutting;thus,reduce the workload and difficulty in construction as well as protect environment as far as possible.This pa-per analyzes the force of tunnel entrance by the theory of Coulomb,and determines whether the entrance scheme should adopt large pipe shed or small duct.The key of portal bracing lies in the limitation of initial support deformation,mean-while,attention should be promptly given to the control of safety distance among tunnel face,inverted arch,and secondary lining and timely closing of loop,inverted arch and lining.
