Large-embedded-depth TBM construction tunnel rock burst treatment structure

Abstract

The invention belongs to the technical field of tunnel TBM construction and discloses a large-embedded-depth TBM construction tunnel rock burst treatment structure and method. The large-embedded-depth TBM construction tunnel rock burst treatment structure comprises a plurality of advance boreholes formed in the vault area of the working face of a tunnel. The advance boreholes penetrate through the rock burst area. All the advance boreholes are connected through fracture crushed zones formed through presplitting blasting in the boreholes. According to the large-embedded-depth TBM construction tunnel rock burst treatment structure and method, the positions and directions of the boreholes are reasonably arranged in the working face of the tunnel through the operation space in a TBM, the crushed zones of a rock body are formed in the vault and spandrel of the rock burst area through borehole blasting, high-pressure water injection is utilized for further promoting development of crushed zone fractures and softening the rock body, high ground stress in the rock burst area is released, the rock burst risk is eliminated, the whole construction process is safe, efficient, low in cost and good in treatment effect, subsequent borehole high-pressure grouting treatment can be conducted to improve the integrity of the crushed zone fractures of the rock body, the collapse quantity and backfilling quantity of the vault during subsequent TBM excavation are decreased, and remarkable economic and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel TBM construction, in particular to a rockburst treatment structure and treatment method for a large buried depth TBM construction tunnel. Background technique [0002] Tunnel excavation has been widely used TBM, that is, full-section tunnel boring machine, TBM has the advantages of high excavation efficiency, good construction quality, small disturbance of surrounding rock, construction safety and environmental protection, high degree of automation and informationization, etc., and has been widely used in water conservancy and hydropower projects , urban subway construction, highways, railways and other fields. However, it has poor adaptability to rockburst and other adverse geological conditions. In the construction of large buried deep tunnels, problems such as TBM jamming and equipment damage are often caused by rockburst disasters. The factors are very small. Once a jamming accident occurs, it...

AI Technical Summary

Problems solved by technology

Constrained by the very narrow space between the TBM and the surrounding rock, the drill and blast method is used to excavate auxiliary holes or pilot holes for rockburst treatment in TBM construction. It is difficult to discharge slag through the narrow space of the TBM directly facing the pilot hole or auxiliary hole , the work efficiency is low, and when the drilling and blasting method is used, the TBM is in a shutdown state, which will affect the TBM construction progress of the entire tunnel; The drill and blast method has a high safety risk for operators, and the drilling and blasting operation is difficult, and the feasibility of implementing pilot tunnel excavation is low

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