Coal-pillar-free roof-cutting gob-side entry retaining inner roof supporting resistance calculation method

A roof support and resistance calculation technology, applied in calculation, earthwork drilling, design optimization/simulation, etc., can solve problems such as inaccurate results, and achieve the effect of reasonable calculation method and improved accuracy

Active Publication Date: 2022-01-28
中煤能源研究院有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the inaccurate results of the roof support method and parameters in the existing technology based on field experience, the present invention provides a calculation method for the roof support resistance of the roadway without coal pillars, which is more reasonable , Accurately determine the support method and parameters of the roof in the roadway, and improve the accuracy of the calculation of the roof support resistance in the roadway without coal pillar cutting roof and gob-side retention

Method used

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  • Coal-pillar-free roof-cutting gob-side entry retaining inner roof supporting resistance calculation method
  • Coal-pillar-free roof-cutting gob-side entry retaining inner roof supporting resistance calculation method
  • Coal-pillar-free roof-cutting gob-side entry retaining inner roof supporting resistance calculation method

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Embodiment

[0128] Project Overview

[0129] The 50107 working face of Dongdong Coal Mine adopts the method of retaining gob-side roadway without coal pillars, with a slope depth of 8.3m and an angle of 15°. The thickness of the direct roof is 2m, outside the range of the cut roof, the thickness of the weak rock layer is 3.3m, the thickness of the basic roof is 9m, the mining height is 3.4m, and the body force of the bedrock is 0.027MN / m 3 , the average body force of the load layer is 0.023MN / m 3 .

[0130] Determination of roof support resistance in roadway

[0131] 1) According to the fracture structure characteristics of the top-cut control layer within the range of the top-cut height and the fracture structure outside the range of the top-cut height in the overlying rock of the Dongdong Coal Mine without coal pillars, the basic top is broken laterally to form a masonry beam Structure, the top cutting controls the breakage of the rock layer to form a short masonry structure, which c...

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Abstract

The invention provides a coal-pillar-free roof-cutting gob-side entry retaining inner roof supporting resistance calculation method, which comprises the following steps: establishing a coal-pillar-free roof-cutting gob-side entry retaining inner roof structure model, and sequentially determining a basic roof overlying strata acting force, a basic roof structure sliding instability transfer acting force and a roof-cutting control strata structure transfer acting force; and the supporting resistance of the roof in the non-coal-pillar roof-cutting gob-side entry retaining roadway is effectively calculated by calculating the acting force of an overlying rock layer on the basic roof, the sliding instability transmission acting force of the basic roof structure and the transmission acting force of a roof-cutting control rock layer structure. The supporting method and parameters of the roof in the roadway are determined more reasonably and accurately. The accuracy of calculating the supporting resistance of the roof in the coal-pillar-free roof-cutting gob-side entry retaining roadway is improved.

Description

technical field [0001] The invention relates to the technical field of coal mine roadway support, in particular to a method for calculating the roof support resistance in a roadway with no coal pillar cutting roof and retaining along the gob. Background technique [0002] Gobside-cut roadway without coal pillars does not set coal pillars, and the mining roadway in the upper section of the working face is reserved by cutting the top and releasing pressure, which is used as the mining roadway in the lower section of the working face, thereby greatly improving the efficiency of coal resource mining. This mining method has been widely used in various mining areas in China. The coal pillar-free mining cancels the transitional role of the section coal pillars, and the stability of the roadway retention is closely related to the roof structure. Roof cutting and pressure relief make the roof form a new way that is different from the traditional mining roof structure. When back mini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21F17/18E21F17/00G06Q50/02G06F30/27
CPCE21D11/00E21F17/18E21F17/00G06Q50/02G06F30/27
Inventor 赵萌烨朱磊吴玉意徐凯黄剑斌秋丰岐刘文涛程海星刘治成
Owner 中煤能源研究院有限责任公司
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