Water-rich stratum tunnel bottom drainage structure and construction method thereof

Abstract

The invention relates to a water-rich stratum tunnel bottom drainage structure and a construction method thereof. A ballast bed base plate is arranged above an inverted arch in a spaced mode; bearing piles are arranged between the ballast bed base plate and the inverted arch; water passing culverts of the tunnel bottom are formed between the ballast bed base plate and the inverted arch; drainage side ditches communicate with the water passing culverts through side ditch drainage pipes; water collecting wells are arranged on the bottom faces of the water passing culverts; the lower ends of the water collecting wells penetrate through the inverted arch to extend into filtering water collecting devices under the inverted arch; water releasing holes are formed in the bottoms and the side walls of the water collecting wells, and filtering layers are arranged on the outer sides of the water releasing holes; and one-way drainage devices are arranged in the water collecting wells. An inverted arch filling part in the prior art is replaced with the ballast bed base plate and the bearing piles; on the basis of guaranteeing tunnel structure safety, the water passing cross section area of a tunnel drainage system is increased, and the tunnel drainage capacity is improved; and meanwhile, underground water under the water-rich stratum tunnel inverted arch is drained, tunnel bottom water pressure is reduced, and preventing of damage such as upheaval of the tunnel inverted arch and frost boiling and mud pumping of a ballast bed is facilitated.

Description

technical field [0001] The invention relates to the technical field of tunnel drainage facilities, in particular to a tunnel bottom drainage structure in a water-rich stratum and a construction method thereof. Background technique [0002] In recent years, with the large-scale construction of transportation infrastructure, many long and complex water-rich tunnels are being built or have been built. The existing tunnel drainage design is based on the conventional tunnel drainage design. The water around the tunnel structure permeates through the initial support and is drained to the central drainage ditch in the tunnel structure through the drainage blind pipe, and finally discharged out of the tunnel. Specifically, such as figure 1 As shown, the groundwater penetrates into the circular drainage blind pipe (serial number 2) through the initial support (serial number 1), and the circumferential drainage blind pipe (serial number 2) is laid along the circumference of the hole ...

AI Technical Summary

Problems solved by technology

Since the central drainage ditch is set inside the tunnel, the water at the bottom of the tunnel cannot be discharged; in addition, the bottom of the tunnel (referred to as the tunnel bottom) in the existing drainage system mainly includes: the surrounding rock at the bottom, the initial support of the inverted arch, and the secondary concrete lining of the inverted arch. , inverted arch filling, pavement structure, roadside ditch, deep buried ditch, curb stone, cable trough, etc.

Due to the lack of an effective drainage system at the bottom of the tunnel, the internal drainage cannot discharge the water at the bottom of the tunnel, resulting in the inability to effectively drain the accumulated water below the inverted arch of the tunnel, causing the inverted arch to bear part of the water pressure, resulting in uplift of the inverted arch, deformation of the ballast bed, and cracks in the lining Water hazards such as damage to the ballast bed, slurry and mud flow, etc., maintenance and treatment are extremely difficult

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