A pressure-bearing tunnel bottom structure drainage system and its construction method

Abstract

The invention relates to a pressure-bearing tunnel bottom structure drainage system and a construction method thereof. A central drainage ditch is arranged in the tunnel, and a drainage side ditch is arranged on both sides of the tunnel, and pressure-bearing and permeable materials are pre-embedded in concrete to form drainage. For the horizontal drainage channel of the side ditch and the central drainage ditch, pressure-bearing and permeable materials are buried under the central drainage ditch to form a vertical drainage channel; the pressure-bearing and permeable material is fabric or rope. The present invention pre-sets pressure-bearing water-permeable materials on the side ditch and the central ditch at the bottom of the tunnel, and between the central ditch and the bottom of the tunnel. Water pressure, reducing the damage to the tunnel structure caused by the water pressure at the bottom of the tunnel.

Description

technical field [0001] The invention relates to the technical field of tunnel drainage facilities, in particular to a pressure-bearing tunnel bottom structure drainage system and a construction method thereof. Background technique [0002] With the large-scale construction of my country's transportation infrastructure, various diseases and risks faced by highway and railway tunnel construction emerge in endlessly. At present, the bottom structure of the designed tunnel is generally a structure with an inverted arch (or floor), and the groundwater discharge path is: surrounding rock→primary support→drainage blind pipe→side ditch→horizontal drainage pipe→central drainage ditch; that is, the water around the tunnel structure passes through The initial support seepage is drained to the central drainage ditch in the tunnel structure through the drainage blind pipe, and finally discharged outside the tunnel. [0003] The traditional drainage system is to set the central ditch in ...

AI Technical Summary

Problems solved by technology

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 Damage and other water damage events, maintenance and treatment are extremely difficult

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