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Method for gob-side entry retaining through three-seam periodical roof cutting entry side self-forming in transition support area

A technology of transitional brackets and self-constructed roadsides, applied in earthwork drilling, mining equipment, tunnels, etc., can solve problems such as difficulty in blocking gangue and complicated construction, achieve high construction efficiency, control the deformation of surrounding rocks, and improve the stress environment Effect

Active Publication Date: 2019-07-19
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of difficulty in retaining gangue and complicated construction in the current gob-side entry retaining process, the present invention provides a method for gob-side entry retaining in which the three-slit period in the transition support area is periodically cut to form the side of the roadway. The specific technical scheme is as follows

Method used

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  • Method for gob-side entry retaining through three-seam periodical roof cutting entry side self-forming in transition support area
  • Method for gob-side entry retaining through three-seam periodical roof cutting entry side self-forming in transition support area
  • Method for gob-side entry retaining through three-seam periodical roof cutting entry side self-forming in transition support area

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Effect test

Embodiment 1

[0034] A gob-side entry retaining method in which the three-seam periodic top cutting in the transitional support area forms the side of the road. The specific construction steps include:

[0035] Step A. Use anchor rods 5 and anchor cables 6 to strengthen the support of the roadway retained along the gob, and install a single hydraulic prop next to the roadway for temporary support. The hydraulic prop adopts a special support to facilitate construction on the roof.

[0036] Step B. In the roadway of the gob-side entry, the advanced position of the working face, the transitional support area of ​​the working face, the inner trending top cutting line 1 is arranged, and the top cutting line can be arranged ahead of the working face in the construction in the roadway, mainly to set the top cutting drilling.

[0037] Among them, the inner trending roof cutting line 1 is arranged in the roadway of the gob-side retaining roadway, the inner trending roof cutting line 1 runs through t...

Embodiment 2

[0053] In order to further illustrate the construction process of the gobside retaining method of three-seam periodic roof cutting and direct roofing in the transition support area, taking the 1201 working face and the 1202 working face of a certain mine as examples, the present invention will be further described in detail.

[0054] The 1201 working face and the 1202 working face of this mine are adjacent to each other. Two coals are mainly mined. The average thickness of the coal seam is 3.2m. Roof strata from bottom to top are sandy mudstone with an average thickness of about 0.8m; fine sandstone with an average thickness of about 2.8m; and siltstone with an average thickness of about 7m. The mining roadway is excavated along the bottom, the section shape is rectangular, and the method of retaining the roadway along the gob is used to set the mining roadway between the two working faces.

[0055] The specific construction steps of carrying out gob-side entry retention by th...

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Abstract

The invention provides a method for gob-side entry retaining through three-seam periodical roof cutting entry side self-forming in a transition support area, and relates to the technical field of mining engineering. The method comprises the steps: A, an entry for supporting gob-side entry retaining is reinforced through anchor rods and anchor cables, and a single hydraulic prop is arranged besidethe entry; B, an inner side traveling-direction roof cutting line is arranged on the advanced position of an entry working face for gob-side entry retaining; C, anchor rods and anchor cables are additionally arranged while stoping is conducted along with the working face, and an outer side traveling-direction roof cutting line is arranged; D, the maximum suspended roof distance of combined rock beams is calculated, the roof cutting stepping distance is determined, the roof cutting stepping distance is smaller than the maximum suspended roof distance, and an inclination-direction roof cutting line is arranged every time the working face is propelled by the distance exceeding the roof cutting stepping distance; E, the combined rock beams fall to form entry sides, and seams between the entrysides and an entry roof are blocked; and F, propelling is conducted along with the working face, the step B to the step E are repeated, after entry surrounding rock is stabilized, the single hydraulicprop is withdrawn, and gob-side entry retaining is completed. The method solves the technical problem that gangue blocking of a thin coal seam during gob-side entry retaining is difficult and furtherhas the advantages that the entry sides are complete, and the deformation of the surrounding rock is small.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a gob-side retaining method in which three-line roof cut reinforcement in a transition support area is reinforced and the roof is periodically lowered to form a side of the road. Background technique [0002] With the increase of mining depth, the mining method of leaving coal pillars in the longwall brings a series of problems, such as large amount of roadway excavation, tight excavation replacement, waste of coal resources caused by leaving coal pillars, and dynamic disasters caused by the stress concentration of coal pillars. The above-mentioned problems can be effectively solved by mining technology of gob-side entry retention, but now the traditional gob-side entry retention is carried out through roadside filling or wall-building to support the roof, the system is complicated, the process is cumbersome, and the roadside filling body or wall is difficult to adapt t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/14E21D20/00
CPCE21D9/14E21D20/00
Inventor 蒋宇静陈永强栾恒杰颜鹏王亚华文志杰张学朋
Owner SHANDONG UNIV OF SCI & TECH
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