Tunnel drainage structure combining deeply-buried central ditch and drainage tunnel and construction method

Abstract

The invention relates to a tunnel drainage structure combining a deeply-buried central ditch and a drainage tunnel and a construction method. The tunnel drainage structure comprises an upper drainagecold-proof structure and a lower drainage cold-proof structure, the upper drainage cold-proof structure comprises an annular blind pipe located between a tunnel primary support and a tunnel secondarylining, the lower drainage cold-proof structure comprises a deeply-buried central ditch and a longitudinal drainage tunnel, the deeply-buried central ditch is longitudinally arranged below the centerline of a tunnel inverted arch, and the longitudinal drainage tunnel is longitudinally arranged below the center line of the deeply-buried central ditch; and the bottom end of the annular blind pipe is connected into the deeply-buried central ditch, and the bottom of the deeply-buried central ditch is connected into the longitudinal drainage tunnel through a vertical PVC pipe with the diameter of100 mm. According to the tunnel drainage structure, underground water flowing and draining paths on the side wall of a traditional tunnel are subverted, water outside a tunnel is rapidly collected andguided into the deeply-buried central ditch, the water is continuously guided into the deep drainage tunnel through an inspection well and drained, and the dual functions of drainage and cold prevention are effectively considered.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a tunnel drainage structure combined with a deep-buried central ditch and a drainage tunnel and a construction method. Background technique [0002] The problem of freezing damage in plateau alpine tunnels is mainly reflected in the fact that the groundwater cannot be drained in time and freezes, resulting in the formation of ditches in the tunnel and freezing of the ballast bed, which seriously affects the operation safety. [0003] The existing waterproof and drainage principles and engineering settings often collect and discharge groundwater and flow through the ditch inside the cave, which is prone to freezing damage such as freezing and icing during the flow process. In order to effectively realize the collection and discharge of underground water in tunnels, it is necessary to realize a convenient and appropriate-scale drainage and cold-proof structur...

AI Technical Summary

Problems solved by technology

[0002] The problem of freezing damage in plateau alpine tunnels is mainly reflected in the fact that the groundwater cannot be drained in time and freezes, resulting in the formation of ditches in the tunnel and freezing of the ballast bed, seriously affecting operational safety

[0003] The existing waterproof and drainage principles and engineering settings often collect and drain groundwater and flow through the ditch inside the cave, which is prone to freezing damage such as freezing and icing during the flow process

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