Construction method for advance grouting and supporting for tunnel partial collapse

Abstract

The invention discloses a construction method for advance grouting and supporting for tunnel partial collapse, and relates to the technical field of tunnel construction. Based on back pressure backfilling, sleeper stacks are used for further supporting the part which have the quickest and largest deformation and is the most unstable in the initial supporting, so that the fact that the entire steelarch wholly collapses from the arch part and causes the currently stable steel frame on the left side of the line to damage together is avoided, and the collapse range and intensity are controlled; the grouting reinforcement is carried out to the deformed section surrounding rock, so that the aims that the deformation is controlled and the safe replacement of the deformed limit invasion steel frame is guaranteed are achieved, and better supporting effect is realized; a butterfly arch is used to better conform to the practical situation of the site surrounding rock, so that the supporting forthe unstable surrounding rock at the single side deformation section is strengthened, and the fact that the supporting intensity meets the site requirements is guaranteed; the advance supporting measures are adopted to improve the front surrounding rock integrity and self stabilization capability, and the construction safety is guaranteed; different from the traditional manner of total-ring arch replacement, the cost is low, the adaptability is high and the generalizability is high.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for performing grouting in advance and supporting partial tunnel collapse. Background technique [0002] On the morning of August 2019, a two-line tunnel of a high-speed railway found through monitoring and measurement that the deformation rate of the initial support on the right side of the D1K469+390~+405 section suddenly accelerated, and the deformation had exceeded the warning value. Immediately start the emergency plan on the site, suspend the construction of the face, evacuate personnel, equipment and materials, and take emergency measures to backfill the deformed section with ballast to prevent the increase of primary support deformation and scope expansion. About 3m. Then, set up sleeper piles at D1K469+400 to D1K469+405 with the largest amount of deformation to support the initial support. [0003] At 17:40 the next day, the connecting...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above technical problems, the present invention provides a construction method for advance grouting and support for partial collapse of tunnels, to solve the problem of deformation of primary support on one side and local collapse caused by weak surrounding rock in double-track tunnels of high-speed railways, and to take effective measures Safe and effective treatment of unilateral primary support deformation and collapse

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