Research on the Construction Technology of Arch Replacement in the Penetration Section of a Poor Geological Tunnel
In the process of tunnel construction,due to the influence of the geological uncertainty of the surrounding rock of the tunnel,the initial support structure often invades the limit of the secondary lining structure,causing the problem of insufficient lining thickness of the secondary lining tunnel.Arch replacement of the initial support structure is an effective means to break the steel frame of the invaded rock mass,and to release the surrounding rock pressure and support again.Based on the Guangxi Yaoshan—Nandan Highway(Phase II)project under construction,and through the cause analysis of such invasion of the initial support of the tunnel and the optimization of the monitoring and measurement in the construction process,the maximum settlement of the tunnel vault is reduced from 95 mm to within 30 mm,providing a theoretical reference for the arch replacement construction of the tunnel in soft surrounding rocks.
tunnelpoor geologginitial support invasion limitarch replacement
NETL
NSTL
万方数据
维普
