Broken surrounding rock and soft rock roadway U-shaped steel sleeve shed support method

Abstract

The invention discloses a broken surrounding rock and soft rock roadway U-shaped steel sleeve shed support method. The support method adopting anchor cables, a metal net, slurry spraying, a U-shaped steel sleeve shed and grouting is adopted. Firstly, an anchor net spraying layer is formed and used for preventing surrounding rock from further weathering and deliquescence, and thus loads on the twosides and the roof of a roadway are evenly acted on a support so as to avoid stress concentration so that rapid weighting deformation of surrounding rock breaking and roof collapse at the initial stage of roadway excavation can be effectively controlled, and an anchor net spraying combination isolation arch on the surface of the roadway is formed finally; and secondly, a support rigid layer is formed between two layers of U-shaped steel, through the structure, high-strength pressure resistance and moderate yielding can be achieved, a rigid and flexible double-layer support structure is formed,the stability and support strength of broken soft rock roadway surrounding rock are greatly improved, a certain guarantee is provided for safe production of a coal mine, meanwhile, a certain amount of roadway maintenance cost is also reduced for enterprises, great benefits are achieved for the development of the coal enterprises, and large-range using and popularization can be conducted.

Description

technical field [0001] The invention belongs to the technical field of roadway surrounding rock support in mining engineering, and relates to a U-shaped steel shed support method for broken surrounding rock and soft rock roadway. Background technique [0002] Studies have shown that the status of coal as the main energy source in my country will not change fundamentally for a long period of time in the future. With the depletion of shallow coal resources, the mining depth and mining intensity of coal mines continue to increase. The severe degree of mine pressure in soft rock roadway shows serious deformation and damage of soft rock roadway. The deep rock mass is in a complex mechanical environment of "three highs and one disturbance", which makes the surrounding rock stability of deep soft rock roadways in coal mines affected by multiple factors, and the problem of surrounding rock control is becoming increasingly prominent. Soft rock roadway support is still an important ...

AI Technical Summary

Problems solved by technology

Both of the above two patents provide methods for controlling the surrounding rocks of relatively broken and soft rock roadways in the deep part, but the former does not carry out anchor net spraying after digging roadways, but directly drills bolt holes for bolt support, which is first of all An anchor cable extrusion reinforcement arch is not formed, which will lead to weak support strength and weak surface protection ability, and secondly, this will further weather and deliquesce the surrounding rock, so that the loads of the two sides of the roadway and the roof cannot be evenly acted on the support As a result, the phenomenon of stress concentration occurs, so that the rapid deformation of the surrounding rock and the collapse of the roof at the initial stage of roadway excavation cannot be effectively controlled, and finally the damage of the roadway is accelerated and the ideal effect cannot be achieved; the latter is not used. U-shaped steel is used for reinforcement and support, which will lead to a short maintenance time of the roadway, which will increase the maintenance cost of the roadway and generate unnecessary economic expenses.

Images