Deep well small coal pillar gob-side entry retaining method based on roof lower key layer roof-breaking pressure relief

A key layer and small coal pillar technology, applied in earthwork drilling, underground mining, directional drilling, etc., can solve the problems of difficult support, difficult to block the infiltration of harmful gas, and high cost, so as to ensure the recovery rate and control The amount of roadway deformation to ensure the effect of efficient production

Active Publication Date: 2021-02-19
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the roof-cutting self-forming roadway technology requires super-strong support for the gob-side retaining roadway, which is difficult and costly, and the roadside retaining system is difficult to block the infiltration of harmful gases; Coal pillar mining technology is seriously affected by high ground pressure, so it is rarely used in deep mine mining

Method used

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  • Deep well small coal pillar gob-side entry retaining method based on roof lower key layer roof-breaking pressure relief
  • Deep well small coal pillar gob-side entry retaining method based on roof lower key layer roof-breaking pressure relief
  • Deep well small coal pillar gob-side entry retaining method based on roof lower key layer roof-breaking pressure relief

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Experimental program
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Effect test

Embodiment 1

[0044] Due to deep mines with thick coal seams, especially high-gas mines, there are difficulties in the ventilation of the mining roadway and the tension of mining continuity, so it is necessary to adopt the layout of the mining roadway along the gob-side entry. As a result, small coal pillars need to withstand high bearing pressure and mining pressure, and it is difficult for small coal pillars to maintain stability. In addition, during the mining process of small coal pillar gob-side entry retaining, it is difficult to determine the parameters of construction broken roof pressure relief and support parameters. Therefore, a deep mine small coal pillar gob-side entry retaining method based on the pressure relief of the key layer below the roof is provided. method, the specific steps include:

[0045] Step A. Determine the geological conditions of the coal seam roof; wherein the geological conditions of the roof include the roof lithology and roof thickness, and also include t...

Embodiment 2

[0060] On the basis of Example 1, taking the working face of a mine that adopts the method of retaining entry along the gob of a small coal pillar in a deep shaft based on the pressure relief of the key layer below the roof as an example, the support effect of this method is further explained through the monitoring situation .

[0061] to combine Figure 7 to Figure 10 As shown, comparing the roof subsidence before and after the pressure relief of the broken roof, the approaching amount of the solid coal side roadway, the approaching amount of the roadside and the change of the working resistance of the bolt, it can be seen that the lower position of the coal seam roof by cutting off the "transfer rock beam" in advance The key layer can effectively transfer the high stress acting on the small coal pillar and gob entry to the farther coal rock layer, so that the small coal pillar and gob entry will be subjected to lower stress and mining dynamic pressure impact, which is benef...

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Abstract

The invention provides a deep well small coal pillar gob-side entry retaining method based on roof lower key layer roof-breaking pressure relief, and relates to the technical field of coal mining. Ventilation and support in deep well gob-side entry retaining are improved. The deep well small coal pillar gob-side entry retaining method comprises the steps that roof geological conditions are determined, blasting parameters are determined according to the roof geological conditions, the roof-breaking pressure relief effects of lower key layers with different thicknesses are numerically simulated,and roof-breaking parameters of a roadway are determined; then excavating blast is conducted in the test roadway, and a displacement monitoring station, an anchor rod and an anchor cable stress monitoring station are arranged on surrounding rock in the roadway; and the supporting parameters are corrected, excavating blast is conducted in the gob-side entry retaining roadway, and supporting is conducted according to the corrected supporting parameters. According to the method, blasting is conducted on the side, deviating from solid coal, of a coal seam roof, stress transmission of the key layer is cut off at the lower key layer of the pre-split coal seam roof, thus high stress acting on small coal pillars and gob-side entry retaining is transferred, therefore the roadway environment is improved, and roadway maintenance is facilitated.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a pressure relief and support method for small coal pillars in deep mines and gob-side entry retention. Background technique [0002] With the depletion of shallow coal mine resources, mine mining depth is increasing year by year, coal seam occurrence conditions are becoming more and more complex, rock burst, coal and gas outburst, high temperature heat damage and other problems seriously threaten the safety of mine production, and at the same time, there is a tension in mining. It is also increasingly prominent, especially for old mines and mines with complex conditions, which seriously restricts the safe and efficient production of mines. Currently, the commonly used gob-side roadway layout has contradictions between the tension of excavation and the series ventilation of high-gas mine working faces; although the above-mentioned problems can be solved by adopting wide coal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18F42D3/04E21B7/04E21D20/00E21D21/02E21F17/103
CPCE21C41/18F42D3/04E21B7/04E21D20/00E21D21/02E21F17/103
Inventor 杨永杰张杨吕嘉锟张添力
Owner SHANDONG UNIV OF SCI & TECH
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