Research on the Construction Risk Assessment and Refined Construction Plan of Chunmushan Extra-long Tunnel
In order to improve construction efficiency and reduce cost of the extra-long tunnel,this study relies on the Chunmu Mountain Tunnel to carry out risk assessment and fine construction technology research.The major difficulties of this tunnel construction were analyzed,and the tunnel risks are evaluated considering various risk sources.Based on tunnel construction process,implementation effect of the"seven sets"large-scale machine operation was analyzed from the perspectives of manpower and construction hours.The economic benefits of different shaft layout options were also compared based on various factors.The conclusions show that:(1)Tunnel risk assessment only considers a single risk and ignores the operation risk,which will make the risk uncontrollable.So tunnel risk should be analyzed from multiple perspectives such as stratigraphic conditions,hydrology and technical level;(2)Compared with the tradi-tional drilling and blasting construction,large-scale operation construction has obvious advantages in reducing labor costs and improving construction efficiency;(3)A scheme with short burial depth,convenient construction and good economic benefits should be choose as the shaft layout scheme under the normal operation ventilation conditions.The research results of this paper provide technical support for the construction of Chunmushan Tunnel,and can also pro-vide technical reference for similar tunnels.
extra-long tunnelconstruction technologyoperation by large-scale machinevertical shaft
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