TBM construction over-crushed zone disaster source advanced control method and system

Abstract

The invention provides a TBM construction over-crushed zone disaster source advanced control method and system. The method comprises the steps of using drilling and geophysical exploration to performcoring on the ground layer in the distribution range of a crushed zone on the ground surface by adopting an advanced drilling method, adjusting the distribution range of a weak crushed area accordingto a coring result, and determining the occurrence position and characteristics of a disaster source at front of a TBM tunneling place; forming a vertical drill hole in the ground surface, conductinglow-pressure permeation grouting reinforcement on the stratum around the TBM, and conducting ground surface grouting treatment on a water-rich weak stratum of the crushed zone; and comprehensively employing geophysical exploration and an inspection hole method to inspect the reinforcement treatment effect of a water-rich crushing disaster source, judging the grouting reinforcement effect until thegrouting treatment effect meets an expected requirement, and then starting TBM tunneling again to guarantee safe and smooth construction.

Description

technical field [0001] The present disclosure relates to a method and system for advanced control of disaster sources in tunnel TBM construction passing through a broken zone. Background technique [0002] TBM has been widely used in the construction of long-distance subway tunnels because of its technical characteristics of high efficiency, high quality, safety and environmental protection. Tunnel construction inevitably passes through unfavorable geological bodies such as fault fracture zones, which are usually weak and broken and connected to water-rich aquifers. The single full-face excavation method of TBM is not conducive to the stability of surrounding rock, and the excavation disturbance near the fracture zone can easily induce instability of surrounding rock and water and mud inrush disasters, resulting in TBM being stuck and buried, which seriously threatens the safety of TBM construction. In addition, due to the obstruction of the TBM cutterhead shield, the infor...

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Problems solved by technology

The single full-section excavation method of TBM itself is not conducive to the stability of surrounding rock, and the excavation disturbance near the fracture zone can easily induce instability of surrounding rock and water and mud inrush disasters, resulting in TBM being stuck and buried, which seriously threatens the safety of TBM construction

In addition, due to the obstruction of the TBM cutterhead shield, the information about the surrounding rock conditions and the water leakage of the excavation surface cannot be collected in a timely and effective manner. Reinforcing the ground and taking into account the safety of the TBM machine will undoubtedly increase the difficulty of project management

[0003] Grouting is usually used to control the disaster source of TBM through the broken zone in advance, but the existing treatment methods have the following three problems: ① There is no comprehensive and accurate judgment on the strata ahead of the excavation, which makes the scope and strength of grouting reinforcement blind. Because the water-rich and weak areas are not reinforced or the reinforcement strength is not enough, and the surrounding rock is more complete, the area is repeatedly reinforced, and the strength is wasted

②The management of the broken zone ignores the safety protection of TBM

The main manifestations are the disorderly diffusion of grout into the TBM, causing blockage and pollution or consolidation of the cutter head and excessive grouting pressure causing damage to the TBM shield

③ Lack of a comprehensive and reliable understanding of the effect of grouting reinforcement, it is easy to cause misjudgment of the effect of reinforcement, rashly start the TBM, which brings great safety risks to the construction, and once a TBM jamming accident occurs, it is necessary to conduct a comprehensive secondary inspection of the fault fracture zone. Reinforcement, a great waste of materials and construction period

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