Prevention method of rockburst in roadway retained by hard roof with wide roadway and flexible chamber wall

Abstract

The invention discloses a wide lane and flexible chamber wall hard roof gob-side entry rock burst prevention method. The method is characterized in that firstly, rib expanding and bottom cutting are performed on the coal wall side of an original gob-side entry, a coal body which is generated after rib expanding is put in a woven bag, and a buffering pressure relief zone is made manually on the rib-expanded coal wall along the gob-side entry; a chamber is excavated in a coal side of one side of a working surface, conventional anchor bolt supporting is performed on a chamber roof, and transverseflexible walls are formed after backfilling is finished; the woven bag filled with materials is used as a wall material, longitudinal flexible walls are built along the rib-expanded space position; the stress distribution of a coal bed is changed by manually making the buffering pressure relief zone, and occurrence of rock burst is prevented; and a flexible combined body is formed by the transverse flexible walls and the longitudinal flexible walls, and the functions of partition, dynamic load relief and impact strength reduction are achieved.

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 this 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 rock burst in entryway retained by hard roof with wide entry and flexible chamber walls

Images