Comprehensive tunnel drainage, precipitation and pressure reduction construction method

Abstract

The invention provides a comprehensive tunnel drainage, precipitation and pressure reduction construction method, relates to an in-tunnel drainage, ground precipitation and comprehensive pressure reduction construction method for a water and mud burst segment of a tertiary system sand shale tunnel and is mainly designed to solve the problems that an existing tunnel is prone to deformation, collapse and even water burst and mud burst in the tertiary system sand shale construction process. Ground precipitation wells are drilled at the positions, eight meters away from the side lines on the two sides, of a ground-direction positive hole, a flat guide hole is formed near the ground-direction positive hole, a drainage hole is formed in the inclined upper direction of the ground-direction positive hole relative to the flat guide hole, tunnel substrate precipitation wells are drilled in both the substrate of the ground-direction positive hole and the substrate of the flat guide hole, a plurality of inclined drainage holes are formed above the inclined front portion of a vault of the ground-direction positive hole, a positive hole vertical drainage hole is formed above the vault of the ground-direction positive hole, and a flat guide hole vertical drainage hole is further formed above the vault of the flat guide hole. The comprehensive tunnel drainage, precipitation and pressure reduction construction method has the advantages that geological disasters such as collapse, deformation, water burst and mud burst are avoided, and tunnel construction safety can be guaranteed.

Description

Technical field: [0001] The invention relates to a construction method of water discharge, surface precipitation and comprehensive decompression in the water gushing and mud gushing section of the tertiary sand mudstone tunnel. Background technique: [0002] With the construction of large-scale, modernized and high-standard urban roads and transportation projects in my country, the number and construction scale of tunnel projects continue to expand, and the geological conditions passed through are becoming more and more complex. Tertiary sand-mudstone is a complex geological surrounding rock. The characteristics of Tertiary sand-mudstone: the main component is clay minerals, containing a small amount of silt, of which the silt content is 25%-50%, the clay content is 75%-50%, and it is easy to soften and erode when exposed to water; the surrounding rock Poor self-stabilization ability, broken, swollen, low strength; development of joints and fissures, etc. The above characte...

AI Technical Summary

Problems solved by technology

[0005] (1) Causing engineering disasters and casualties

Tertiary sand-mudstone areas are characterized by rich water and mud and sand. When a large water inrush occurs during the construction of a tunnel, it is often accompanied by mud and sand gushing, which will submerge the tunnel and destroy the equipment. Tunnels are abandoned and easy to locate, and even cause heavy casualties. For example, tunnels on the Yiwan Railway Red Deer and other tunnels are constructed on a flat surface, and the surrounding rocks in the fracturing arch of the dissolved cavity water body are overlying, causing extremely large water inrush disasters. The maximum water inrush is as high as 30 ×104m3 / h, causing 11 deaths

[0007] (3) Destroying the balance of the water resource system

[0008] (4) Other potential hazards

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