Construction Safety Risk Control of Soft Rock Shallow-Buried Double-Arch Tunnel Based on Trajectory Intersection Theory
The cross-sectional forms of highway tunnels are highly diverse.Due to the complex procedural control requirements,the double-arch tunnel structure is associated with numerous hidden safety hazards during construction and poses significant challenges for safety risk control,leading to its relatively limited application in practical engineering.Taking the Xinsen Tunnel in the Science City as an example,this paper integrates the characteristics of shallow burial depth and low surrounding rock strength.Based on the construction methodology of double-arch tunnels,a combined technology of mechanical rock drilling and controlled blasting excavation is adopted.Stringent measures are implemented to control the construction of anchor bolts and horizontal braces at the toe of the mid-pilot tunnel's concrete wall.Careful management is exercised over the lengths of the upper and lower benches of the pilot tunnel and the distances between the sequentially excavated working faces of the left and right tunnels,as well as the intervals between excavation,support,and secondary lining of the left and right tunnels.These measures limit the occurrence of human error trajectories related to over-excavation and prevent excessively long unsupported exposure of the excavation face's surrounding rock,effectively addressing the stability issues of the soft rock face in shallow-buried tunnels.By ensuring short excavation footage,controlled bench heights,and early closure,the safe and successful completion of this tunnel project provides crucial reference for similar tunnel construction projects.
Soft rockShallow-buriedDouble-arch tunnelTrajectory intersectionBehavioral errorsSurrounding rock environment
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