A roadway support method for strong impact rock pressure

Abstract

A support method for roadway under strong rock burst is to adopt a three-stage combined support method of anchor net, U-shaped shed, and energy-absorbing anti-scour support in the roadway under rock burst, including the following steps: After 100cm, use metal mesh to lay the roof and roadway side, install and fix the energy-absorbing anti-scour anchor; ⑵Drill the anchor cable installation hole on the roadway roof and install the anchor cable in it; ⑶Place the U-shaped shed and lock the U-shaped Shed overlapping position; (4) Complete steps 1, 2, and 3 in a cycle as the mine roadway is excavated. When the roadway is excavated 600-800 cm, start to install the energy-absorbing anti-scour bracket, and complete steps 1, 2, 3, and 4 in a cycle as the mine roadway is excavated. ; While excavating, according to the geological conditions of the roadway, the anti-scouring bracket is used for reinforcement and support to ensure the stability and safety of the roadway. This method has important practical significance and great social benefits in terms of ensuring safe and efficient mining of coal mines, saving production costs, improving economic benefits, and maintaining social stability, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of mine safety mining support, and in particular relates to a strong impact rock pressure roadway support method. Background technique [0002] Rockburst is a major dynamic disaster encountered in coal mining. It is a dynamic phenomenon characterized by sudden, sharp and violent damage caused by the release of deformation energy of coal and rock mass around mine shafts and stopes. Simply put, rock burst is the sudden failure of coal and rock mass. Like the explosion of a large amount of explosives contained in the coal and rock, the coal and rock were thrown out suddenly, causing a large number of breakages of the supports, roof collapse, blockage of the roadway and injury to personnel, accompanied by loud noise and vibration of the coal and rock mass. my country is rich in coal resources, but the coal resources with superior geological deposits in shallow areas are being exhausted day by day. It is an inev...

AI Technical Summary

Problems solved by technology

Bolt support is economical and practical, and is widely used in coal mine engineering. However, the existing bolts cannot achieve the anti-shock effect, and it is difficult to popularize and apply them in roadway support with impact

U-shaped steel support can provide high supporting force, but the friction force provided by U-shaped steel connectors cannot meet the requirements, and the working resistance can only reach 40% to 60% of its carrying capacity, and the supporting capacity of the bracket cannot be fully utilized.

In addition, the U-shaped bracket is prone to uneven force, concentrated load and eccentric load locally, the bracket is twisted and deformed, the bearing capacity of the bracket is greatly reduced, and the overall instability and damage are very easy to occur when impact occurs

Shed-cable synergistic support can enhance the strength of the surrounding rock and improve the support capacity, but the variable travel is small and the anti-scour ability is poor

Shotcrete support enhances the strength of the surrounding rock and reduces and prevents the deformation of the surrounding rock, but it is not suitable for preventing rock burst

The advanced hydraulic support adopts hydraulic props as support, which has high support strength and has achieved the function of supporting the overlying rock stratum. However, when impact ground pressure occurs, it is difficult for the hydraulic support to resist the strong impact load, causing the support pillars to bend, break and explode. Cylinder etc.

Most of the existing roadway support methods are not designed from the perspective of scour prevention, which cannot meet the requirements of roadway support under strong impact rock pressure

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