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Static breaking roof cutting and pressure releasing method for gob-side retained roadway

A technology of roof cutting, pressure relief and static crushing, which is applied in blasting, earth square drilling, ground mining, etc.

Inactive Publication Date: 2017-08-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, explosives and other pyrotechnics are state-controlled items, and their approval and use have strict requirements, and our country also expressly prohibits or restricts their application in goafs of high-gas mines

Method used

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  • Static breaking roof cutting and pressure releasing method for gob-side retained roadway
  • Static breaking roof cutting and pressure releasing method for gob-side retained roadway
  • Static breaking roof cutting and pressure releasing method for gob-side retained roadway

Examples

Experimental program
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Embodiment 1

[0070] Taking the working face 1 of a certain mine as an example, see the attached figure 1 - attached Figure 4 As mentioned above, the mining face 1 is arranged along the 3# coal seam 2, the average thickness of the 3# coal seam 2 is 2.86m, the occurrence is stable, and the structure is relatively simple. Black sandy mudstone with an average thickness of 11.31m; the basic top 4 is fine sandstone with an average thickness of 2m. The mining face 1 adopts the "three inlets and one return" ventilation system, and pours a 2m-wide high-water quick-setting material filling wall 6 on the gob side 8 of the auxiliary air inlet lane 5 to retain it for transportation to the next working face. For level entry, the lateral roof cutting test of the goaf side 8 is carried out in the gob-side entry retention 7.

[0071] Step 1: According to the mine pressure observation data, during the mining process of mining face 1, the overlying strata was broken, resulting in significant deformation ...

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Abstract

A static breaking roof cutting and pressure releasing method for a gob-side retained roadway comprises the steps that the roof cutting position is selected; the intervals, diameters, angles and depths of drilled holes are determined; drilling construction and charging are conducted; the dosage of static blasting agents is calculated; and punching, charging and hole sealing serve as one time of roof cutting and pressure releasing working circulation and are conducted circularly. Roof cutting and pressure releasing construction is conducted in the retained roadway on the rear portion of the working surface, so that the working procedures of punching, charging, hole sealing and the like, working surface stoping and manual wall building do not interfere with one another, and smooth conducting of roof cutting and pressure releasing is facilitated; and roof cutting beside the roadway is achieved before retained roadway surrounding rock deforms to destroy a suspending roof structure of the retained roadway gob side, so that a suspending roof beside the roadway fully collapses, the stress environment is improved, and the purpose of reducing stress concentration and mining pressure of a roof on the side of the gob-side retained roadway is achieved.

Description

technical field [0001] The invention relates to a method of static crushing and roof cutting for gob-side entry retention, especially a method for top-cutting and pre-splitting drilling in gob-side entry retention that has been formed behind the working face and near the side of the filling wall next to the entryway. A method of roof cutting and pressure relief that places a static expansion agent in the borehole to destroy the cantilever rock beam and the basic top arc triangular block structure formed after the roof of the mined-out side is broken. Background technique [0002] Gobside entry retaining to realize coal pillar-free mining has the advantages of high resource recovery rate and low mining ratio, and has been applied and promoted in many coal mines. However, the production practice shows that under the action of the lateral support pressure formed by the cantilevered rock beam on the goaf side roof and the basic top arc triangular block structure, the filling wal...

Claims

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Application Information

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IPC IPC(8): E21C41/18F42D1/00F42D1/08
CPCE21C41/18F42D1/00F42D1/08
Inventor 郝兵元王凯张鹏鹏冯国瑞马俊生郭计云宋朝部
Owner TAIYUAN UNIV OF TECH
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