Total-section closed type deep-shallow coupling yielding, bolting-grouting and supporting method for incompact and fractured soft-rock roadway

Abstract

The invention relates to a total-section closed type deep-shallow coupling yielding, bolting-grouting and supporting method for an incompact and fractured soft-rock roadway. On the basis of a multilayered cooperative supporting principle, a spraying net combined isolating arch, an anchor rod extruding reinforcing arch, a total-section closed type grouting reinforcing ring and a deep slurry diffusion reinforcing arch are respectively formed on surrounding rock of the roadway from shallow to deep finally, and are combined to form a multilayered effective combined arch by a suspension effect of a high-strength grouting anchor cable, advantages of yielding supporting, bolting-grouting supporting and deep-shallow coupling supporting are combined organically, bearing range, integrity and bearing capability of a supporting structure are improved obviously, a control effect on deformation characteristics of large deformation, high speed, long duration, wide destroying range, peripheral pressing, obvious floor heaves and the like of the surrounding rock of the incompact and fractured soft-rock roadway is excellent, and various deformations of the surrounding rock of the incompact and fractured soft-rock roadway are controlled effectively. The total-section closed type deep-shallow coupling yielding, bolting-grouting and supporting method is particularly suitable for a large-section incompact and fractured soft-rock roadway of a deep well, is simple in work procedures and low in cost, and has high field promotion and application value; and parallel operation can be realized.

Description

Technical field [0001] The invention relates to a coal mine roadway bolt-grouting combined support method, in particular to a full-face closed deep-shallow coupling pressure-relief bolt-grouting support method for broken soft rock roadways with large deformations in deep mines, and belongs to the field of coal mine roadway support. Background technique [0002] With the increasing depletion of coal resources in the shallow part of our country, the depth of coal mining is extending to the deep part at a speed of 8-12m / a. The geological occurrence environment of deep coal resources is extremely complex. It is inevitable that deep mine tunnels will pass through faulty broken zones, weak rock formations and other bad geological bodies during the tunneling process. The tunnel deformation and damage are very strong, and support control is very difficult, which seriously affects the safety and safety of the mine. Production construction. [0003] The deformation and failure of the deep b...

AI Technical Summary

Problems solved by technology

This method has a significant control effect on the shallow surrounding rock failure forms such as roof fall, slab, and floor drum in the complex fault fracture zone, but it ignores the control of deep crack expansion in the surrounding rock, and is not suitable for wide range of deformation damage and long duration. roadway surrounding rock, and the method is complex and costly

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