Construction method for safe crossing of fractured stratum TBM (tunnel boring machine)

Abstract

The invention relates to a broken stratum TBM safe crossing construction method. The method comprises the working procedures of advanced geological forecasting and ascertaining, surrounding rock pre-treatment and reinforcement, cutterhead disengagement and continuous tunneling, supporting anchor jetting and primary supporting reinforcement and the like. Geophysical exploration and drilling are combined during advanced forecasting, rock exploration and water exploration are combined during geophysical exploration, and active and passive seismic sources are combined during rock exploration; during front reinforcement, chemical grout is poured in a down-the-hole mode through a small guide pipe to seal a tunnel face, and the arch top is reinforced through deep hole grouting of a large pipe shed; during disengagement of the cutterhead, a water-poor small-range broken stratum is subjected to slag extraction and disengagement through a cutterhead slag outlet, and a water-rich large-range broken stratum is subjected to slag removal and disengagement in front of the small pilot tunnel cutterhead; during primary supporting, the steel arch, the steel bar rows and the anchor rods are densified to increase the primary supporting strength, and surrounding rock radial grouting and primary supporting surface guniting are adopted to improve the rigidity. The unfavorable situation that the TBM is clamped and trapped in the broken stratum can be systematically twisted, so that the TBM clamping and trapping risk is reduced, and the TBM construction progress is improved.

Description

technical field [0001] The invention relates to the field of tunnel construction by a full-section rock tunnel boring machine (TBM) method, in particular to a TBM safe crossing construction method in broken strata. Background technique [0002] More and more long tunnels need to be built, and the rock tunnel boring machine (TBM) method has become the preferred method. However, the geological conditions that the TBM needs to pass through are becoming more and more complex, especially the deformation and collapse of the surrounding rock caused by the broken stratum, resulting in the TBM being stuck and trapped. SUMMARY OF THE INVENTION [0003] Based on this, it is necessary to provide a safe crossing construction method for TBM in broken strata to reduce the risk of TBM getting stuck and improve the construction progress of TBM, aiming at the problem of TBM being stuck and trapped due to the deformation and collapse of surrounding rock in broken stratum. [0004] In order ...

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Problems solved by technology

[0003] Based on this, it is necessary to solve the problem of TBM being stuck due to the deformation and collapse of the surrounding rock in the broken ground, and provide a safe crossing construction method for the TBM in the broken ground to reduce the risk of TBM getting stuck and improve the construction progress of the TBM.

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