Safety Evaluation of Existing Operating Tunnel under Newly Built Overpass Tunnel
As highway construction continuously develops,the newly built tunnel inevitably crosses over or under existing tunnels in the form of separate interchanges.Based on the construction of an overpass tunnel crossing the existing operating tunnel,this paper calculated the initial support safety factor,secondary lining safety factor,and secondary lining crack width of the existing tunnel under two calculation conditions via the load-structure method and plane strain mode,respectively.It can be concluded that the initial support and secondary lining safety factors of the existing tunnel under the calculation condition all met the strength design requirements and the crack width met the requirement of normal use.
newly built tunnelexisting tunnelseparate interchangesafety evaluation
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