A kind of continuous double hull reinforcement method for deep tunnel

Abstract

The present invention provides a deep roadway continuous double-shell reinforcement method suitable for large burial depth, high stress, surrounding rock fragmentation, large deformation and long service life, comprising the following steps: (1) Carry out anchor spraying once immediately after the roadway is excavated Support; (2) Implement secondary support at 30-40m behind the excavation head, fill up the top anchor cables and side anchor cables, and re-spray the second concrete layer; (3) After the re-spraying of the second concrete layer, 1 to 2 (4) Lag shallow grouting for 10-20 days, and drill the second grouting hole with a depth of 3-5m on the top to form a deep grouting reinforcement shell; (5) Finally, backfill the bottom slab with stones to form the bottom slab layer, and form the net section of the roadway between the first concrete layer and the second concrete layer. The continuous double-shell reinforcement method of the deep roadway according to the present invention forms a continuous double-shell superimposed support structure through step-by-step, multi-level support and reinforcement methods.

Description

technical field [0001] The invention relates to a roadway reinforcement method, in particular to a deep roadway continuous double-shell reinforcement method. Background technique [0002] At present, my country's coal mines are deepening at a rate of 10-12m per year, and some mines in the central and eastern regions have entered the deep mining stage. It is estimated that in the next 20 years, most of the domestic mines will enter the deep mining stage one after another. With the increase of mining depth, the surrounding rock characteristics of the deep roadway have changed, and the surrounding rock has transformed into engineering soft rock, which is greatly affected by the ground stress. The deformation and damage of the roadway are serious, and the bottom is generally serious. The theory and technology are not suitable for deep roadway control, the primary support cost of the roadway has increased significantly, and the repair rate and cost of the roadway have doubled, se...

AI Technical Summary

Problems solved by technology

With the increase of mining depth, the surrounding rock characteristics of the deep roadway have changed, and the surrounding rock has transformed into engineering soft rock, which is greatly affected by the ground stress. The deformation and damage of the roadway are serious, and the bottom is generally serious. The theory and technology are not suitable for deep roadway control, the primary support cost of the roadway has increased significantly, and the repair rate and cost of the roadway have doubled, seriously affecting the mining of deep coal resources

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