Enlarging repair and reinforcement method of roadways at crossing

Abstract

The invention discloses an enlarging repair and reinforcement method of roadways at a crossing. The method includes the steps of 1, selecting the roadways at the crossing, requiring enlarging repair and reinforcement, and referring the roadways on left and right sides of the crossing as a left crossheading and a right crossheading; 2, detecting growth condition of surrounding rock fissures of the right crossheading, and performing grouting reinforcement; 3, enlarging the right crossheading to form an enlarged right crossheading (10); 4, closing the left crossheading; and 5, excavating a new left crossheading (12) on one side of the left crossheading. The problems that when the roadways at the crossing are under the effect of factors such as mining induction and high stress, surrounding rock deformation is large and repair and reinforcement are difficult can be effectively solved. Effective bearing area of a coal (rock) pillar in a repaired triangular area is not decreased but increased, unit stress of the coal (rock) pillar is reduced, and overall stability of the coal (rock) pillar is improved. During repairing, the left and right crossheadings are carried out in order, and normal production of a mine is guaranteed.

Description

technical field [0001] The invention relates to a coal mine roadway support method, in particular to a roadway expansion and reinforcement method at an intersection point, and belongs to the technical field of coal mine roadway support. Background technique [0002] In the process of coal mining, in order to meet the needs of mine production, roadways are often designed to intersect in pairs. Such roadways are called cross roadways, and the positions where the roadways intersect or branch are called cross points. Roadway intersections are usually located in key parts of mines, once damaged, it will affect the normal use of the entire roadway. [0003] The span of the roadway and the overhang area of ​​the roof at the intersection point are relatively large, and under the superimposed influence of the supporting pressure area on both sides of the roadway at the intersection and the pressure relief area of ​​the roof, the surrounding rock of the roadway is prone to loosening a...

AI Technical Summary

Problems solved by technology

However, after the roadway is enlarged, the effective bearing area of ​​the coal (rock) pillar in the triangular area decreases, which increases the unit force of the coal (rock) pillar, and the stability of the coal (rock) pillar cannot be effectively controlled under high stress. During the roadway expansion process, mine production work cannot be carried out normally

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