Strong rock burst roadway supporting method

Abstract

The invention discloses a strong rock burst roadway supporting method. According to the bolt-mesh-anchor type support coupling supporting structure, a three-level combination supporting manner including anchor net, a U-shaped shed and energy absorption and impact prevention supports is adopted. The method comprises the following steps of first, after rock burst mine roadway tunneling is carried out for 100 centimeters, metal net is laid on the roof and the sides of a roadway, and energy absorption and impact prevention anchor rods are installed and fixed; second, anchor rod installation holesare perforated in the roof of the roadway, and the anchor rods are installed in the anchor rod installation holes; third, the U-shaped shed is placed, and the lap joint position of the U-shaped shed is locked; fourth, along with mine roadway tunneling, the first step, the second step and the third step are completed in a cycle manner; and when roadway tunneling is carried out for 600 centimeters to 800 centimeters, the energy absorption and impact prevention supports start to be installed, and along with mine roadway tunneling, the first step, the second step, the third step and the fourth step are completed in a cycle manner. The impact prevention supports are adopted for reinforcement and supporting according to the geological conditions of a roadway while tunneling is carried out, and stability and safety of the roadway are guaranteed. The strong rock burst roadway supporting method has the important practical significance and the significant social benefit in the aspects of high-efficiency mining with coal mine security guaranteed, production cost reduction, economical benefit improvement, social stability maintenance and the like, and has the broad application prospect.

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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