Partial deep-buried drainage ditch structure at tunnel base

Abstract

The invention discloses a tunnel base local deep-buried drainage ditch structure. The tunnel base local deep-buried drainage ditch structure comprises a center drainage pipe located in tunnel inverted arch padding and a plurality of inspection wells arranged in the length direction of the center drainage pipe. A local deep-buried drainage ditch is arranged in a tunnel base, an end inspection well is arranged in one end of the local deep-buried drainage ditch, a water catchment well is arranged in the downstream of the end inspection well, the end inspection well and the water catchment well are communicated through a plurality of vertical water guide pipes and a plurality of longitudinal water guide pipes, and the water catchment well is communicated with the center drainage pipe. Accumulated water in the tunnel base is collected into the end inspection well through the local deep-buried ditch, then enters the water catchment well through the vertical water guide pipes and the longitudinal water guide pipes and finally is drained out of the tunnel through the center drainage pipe. The tunnel base local deep-buried drainage ditch structure is suitable for locally draining water in the tunnel base, the construction difficulty and risk caused when a center deep-buried ditch is arranged in the whole tunnel and the project cost are reduced, water pressure borne by a tunnel structure is reduced, lining structure water leakage and even lining cracking caused in the construction and operation period of the tunnel are prevented, and operation safety is guaranteed.

Description

technical field [0001] The invention relates to a tunnel base drainage ditch structure, in particular to a partially deeply buried drainage ditch structure arranged at the tunnel base. Background technique [0002] At present, there are two ways to drain the tunnel base: one is to let the accumulated water in the tunnel enter the side ditch through the side wall drain hole, and then introduce the side ditch into the central ditch located in the inverted arch filling. This method is more common; the other One is to set a central deep-buried ditch or a drainage tunnel at the bottom of the tunnel to directly drain the water out of the tunnel. This method is often used in the entrance section of the tunnel in cold or severe cold regions, and it is also used in other situations. Although these drainage systems can be successfully implemented in various strata and play a certain role, many problems have been found during construction and operation, mainly as follows: [0003] Whe...

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Problems solved by technology

[0003] When the first method is used, the base water must enter the central ditch through the side wall drain holes, and the central ditch is located in the inverted arch filling, which has the problem of difficult drainage at the bottom of the tunnel. From the perspective of the tunnels that have been in operation, when the tunnel When the accumulated water at the bottom cannot be drained away smoothly, the lighter ones will infiltrate into the ballast bed along the weak position, and the base will turn mud and mud will flow out;

When using the second method, the water in the tunnel can basically be discharged smoothly, but on the one hand, the construction cost will remain high if the central deep-buried ditch or drainage tunnel is used for the entire length of the tunnel; on the other hand, combined with previous construction experience , in the center of the large-scale excavation at the bottom of the tunnel to deeply bury the ditch or drainage hole, the excavation of the construction will easily cause the invert arch of the initial support to be unable to be closed in time, and the excavation by means of blasting will also easily cause the instability of the tunnel arch wall. Greatly increase the construction risk, and there are many hidden dangers after the construction is completed

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