Facility and process for stably supporting steeply inclined mining roadway surrounding rock

Abstract

The invention discloses a facility and process for stably supporting a steeply inclined mining roadway surrounding rock. A roadway cross section of a mining roadway is an inclined wall arch, the portion above the mining roadway is an arch apex, a top plate is an inclined wall, a base plate is an arched reverse bottom, and a roadway bottom surface is located below the arch apex and is divided into a next section coal seam and a flat bottom. The supporting facility comprises an anchor net support formed by anchor rods, anchor cables, steel belts and metal nets and a closed guniting layer on the surface of the roadway. The supporting process comprises the steps of anchor net installation and concrete spraying on the surface of the roadway. For repeated coal-mining affecting gob-side mining roadway, the process utilizes the high-strength anchor rods and the anchor cables, combines with the W-shaped steel belts and the metal nets, then combines with an asymmetrical multi-medium coupled supporting mode for the concrete sprayed on the surface of the roadway and can effectively control roadway deformation, and safe production of the roadway is achieved. The total reserves of steeply inclined coal seams in domestic reserves are 15%-20%, a foundation is laid for coal seam roadway supporting by adopting the process, and the popularization prospect is wide.

Description

technical field [0001] The invention relates to a coal mine tunneling roadway support facility and a tunneling roadway support technology. It belongs to the field of coal mining. Background technique [0002] The steeply inclined coal seam has an angle of more than 45°, which is internationally recognized as a difficult-to-mining coal seam. my country's large dip and steeply inclined coal seams account for 15% to 20% of the reserves, and their annual output accounts for about 10% of the country's total coal output. The roof, sides, and floor of the roadway in steeply inclined coal seams are different in lithology, and the rock stratum is easy to slip along the layer, so the surrounding rock stress distribution of the roadway, mine pressure appearance and the bearing status of the support are more complicated than those of other coal seams. Its main characteristics It is: (1) The deformation and destruction of the roadway surrounding rock are asymmetrical; (2) Due to the la...

AI Technical Summary

Problems solved by technology

(2) The roadway first deforms from the bottom plate, and the bottom drum appears, which then causes the side legs to become unstable, and finally causes the roof to sink

(4) There is no obvious bending phenomenon on the top beam of the scaffolding, but serious bending, torsion and bottoming phenomenon appear on the scaffolding legs

(5) The roadway in some sections is affected by water, and the surrounding rock appears muddy expansion, which causes the deformation of the roadway to increase

[0006] In many cases, the mining roadway will be severely deformed and damaged during the excavation process. In some areas, the roof and floor will move closer to about 1m, and the two sides of the coal and rock mass will be loose and broken. It usually requires multiple repairs to barely maintain the basic stability of the roadway, and the maintenance investment is high. In addition, the roadway will be affected by more mining operations after serving the subsequent coal mining face, and it will be more difficult to maintain the stability of the roadway, which will seriously affect the normal production. , for more follow-up mining services

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