Method of preventing rockburst in roadway retained by hard roof with buffer pressure relief belt and flexible wall in wide roadway

Abstract

The invention discloses a method for preventing impact ground pressure of a hard roof remained roadway by a buffer pressure relief belt and a wide roadway flexible wall. The method is characterized bycomprising the steps that firstly, side expanding and bottom excavating are carried out on the coal wall side of an original remained roadway, and coal bodies after side expanding is carried out areloaded into a woven bag for stand-by application; in accordance with a conventional method, holes are punched in the coal wall after side expanding is carried out for blasting, and the buffer pressurerelief belt with the width of 8-12 m is artificially manufactured; the woven bag with loaded materials is used as the wall material, and an artificial wall with the width of 1.5-1.6 m is built alongthe space position after side expanding is carried out; and the flexible wall is reinforced and blocked by a combined technique of a protective net and a single prop. Through the buffer pressure relief, the impact properties of the coal bodies are changed; and the artificial flexible wall and blasting in the roadway side are adopted to form a flexible body so as to realize impact prevention of theremained roadway.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] Gobside entry retention (referred to as entry entry retention) means that after the mining of the previous section of the coal mine, the transport entryway is expanded and maintained with special support materials, so that it is retained as a return to the next section of the working face. Wind Lane. This kind of roadway can be used twice, which is a method in the coal pillarless mining technology. Gobside retaining can maximize the recovery of resources and avoid coal loss. [0003] Rockburst is one of the most serious dynamic disasters. The geological factors affecting rockburst include structure, buried depth, roof, coal seam hardness, mining factors, etc.; the deeper the geological factors play the decisive role, and the damage appears to be more serious , in which the rockburst caused by the hard roof occupies a large proportion and is more destructive. ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of rock burst in gob-side entry under the condition of hard roof at present, and propose a method for preventing and controlling rockburst in gob-side entry with buffer pressure relief belt and wide-opening flexible wall

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