Pressure-relief-reinforcement cooperative maintenance method for roadway under boundary coal pillar

Abstract

The invention provides a pressure-relief-reinforcement cooperative maintenance method for a roadway under a boundary coal pillar, relates to the technical field of mining engineering, and solves the technical problem of roadway support under the boundary coal pillars. The method includes the steps that firstly, the cracking range of an overlying boundary coal pillar is determined, and then a proper cracking method is selected to damage the overlying boundary coal pillar; then, fracturing coal bodies are constructed at the two sides of the roadway, so that stress at the two sides of the roadwayis transferred to a deep part; and the two sides of the roadway are reinforced and supported by using anchor cables, so that plastic areas of the two sides of the roadway below the overlying boundarycoal pillar form a new bearing anchoring area under the action of the reinforcing anchor cables. The cracking range of the boundary coal pillar is determined according to the width of the roadway, the minimum horizontal distance between the boundary of the roadway and the edge of the overlying boundary coal pillar and the like, and cracking construction parameters, cracking ranges of the two sides and the construction parameters are calculated according to actual geological conditions. According to the pressure-relief-reinforcement cooperative maintenance method for the roadway under the boundary coal pillar, the fracturing range is reasonably determined through calculation, so that the construction technical difficulty is reduced, and the method further has the advantages of high roadwaystability and the like.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a pressure relief-reinforcement coordinated maintenance method for a roadway under a boundary coal pillar. Background technique [0002] Coal resources in mines are mostly stored underground in the form of short-distance coal seam groups, and most of them are mined underground. In the downward mining, due to the influence of geological conditions and mining technology, some roadways are arranged under the overlying boundary coal pillars. Affected by the stress transfer of the overlying boundary coal pillars, the surrounding rock of the roadway below the boundary coal pillars is prone to floor heaving, Roadway instability problems such as cracks and collapses have seriously hindered the normal production of coal mines. [0003] At present, in order to solve the impact of the overlying boundary coal pillar on the lower roadway, roadway maintenance is mainly carried out ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of roadway support under the boundary coal pillar, ensure the stability of the roadway below the overlying boundary coal pillar, and avoid disasters such as rock burst, large deformation of the surrounding rock of the roadway, and coal wall slabs, the present invention provides a boundary The pressure relief-reinforcement collaborative maintenance method of the roadway under the coal pillar reduces the difficulty of construction and improves the operability of the roadway maintenance method by reasonably determining the cracking range of the coal pillar at the boundary of the overlying strata

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