Water-rich weak surrounding rock long-and-big tunnel construction method

Abstract

The invention discloses a water-rich weak surrounding rock long-and-big tunnel construction method. The method includes that a tunnel inclined shaft is arranged on one side of a main tunnel of a tunnel to be constructed, the main tunnel is divided into a tunnel entry section, a tunnel exit section and a middle connecting section connected between the tunnel entry section and the tunnel exit section, the middle connecting section is divided into an inclined shaft assisting construction entry section and an inclined shaft assisting construction exit section, and each of the tunnel entry section, the tunnel exit section, the inclined shaft assisting construction entry section and the inclined shaft assisting construction exit section is divided into multiple sections for construction. A construction method of each section includes: step 1, performing geological forecasting in advance, and when a debris flow formation exists ahead, entering a step 2, or else, entering a step 3; step 2, performing stability control construction; step 3, determining a primary supporting scheme; step 4, excavating the tunnel, and performing primary supporting construction; step 5, performing secondary lining construction on the tunnel. The water-rich weak surrounding rock long-big tunnel construction method is simple in step, reasonable in design, simple and convenient to construct, good in using effect, capable of meeting construction requirements of water-rich weak surrounding rock long-and-big tunnels, short in construction period and safe in construction process.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method for a long tunnel with rich water and weak surrounding rock. Background technique [0002] The new Lanzhou-Xinjiang Railway's second double line (hereinafter referred to as the Lanzhou-Xinjiang High-speed Railway) has a total length of 1776Km, from Lanzhou West Station in the west to Urumqi Station. It is currently the world's highest high-speed railway built at one time and the longest. The Qilianshan Tunnel and the Daliang Tunnel in the newly-built Lanzhou-Xinjiang Railway are currently the highest high-speed railway tunnels in the world and both are Class I high-risk high-speed railway tunnels. The distance between the two tunnels is 272m, and the locations are close. seasonally frozen regions. The total length of the Qilian Mountain Tunnel is 9,490 meters. It is located in the middle mountainous area of ​​the Qilian Mountains at ...

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Problems solved by technology

[0003] The construction difficulties of the Qilianshan Tunnel and the Daliang Tunnel are mainly reflected in the following aspects: first, the tunnel is located on a plateau, high cold and hypoxic, the climate is cold, and the construction environment is harsh; second, the long tunnel crosses the fault debris flow zone and the high ground stress Complicated and unfavorable geological sections such as soft rock with large deformation, water-rich strata, and water and mud inrush are special geological conditions that have never been encountered in the history of tunnel construction, and there is no successful experience for reference; third, the tunnel is long and the construction period is tight. high standard

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