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Non-coal-pillar longwall mining method based on 120 mode

A mining method and a technology without coal pillars, which can be used in mining equipment, surface mining, mining equipment, etc., can solve problems such as low strength and weak integrity, and achieve the effects of improving efficiency, simple construction, and preventing air leakage.

Inactive Publication Date: 2020-09-08
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Roof caving along the goaf is to use the mine pressure and the low-strength and weak integrity characteristics of the direct roof, so that the pressure in the goaf collapse area and the roof of the gob-side entry retaining area realizes stress zoning. After the roof of the area collapses naturally under the action of periodic pressure, a new roadside is formed, but this method is only applicable to non-natural coal seam mines with weak roof conditions and no gas

Method used

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  • Non-coal-pillar longwall mining method based on 120 mode
  • Non-coal-pillar longwall mining method based on 120 mode
  • Non-coal-pillar longwall mining method based on 120 mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A longwall mining method without coal pillars based on the 120 model. Specifically, one working face is arranged, a wide roadway is dug and divided into two roadways, and 0 coal pillars are left for mining. Building a supporting wall to isolate the goaf and reserved roadway, so as to ensure the continuity of mining and improve the efficiency of roadway retention and mining, the steps of the method include:

[0028] A. Design the working face within the stope range and divide the mining range. Before mining at the working face, calculate the maximum sinking of the gob-side entry retaining roof according to the known geological conditions and the mechanical structure model of the stope roof subsidence calculation, combined with the mining conditions quantity. Among them, the maximum sinking amount of the roof h L The calculation is specifically:

[0029]

[0030] Among them, C is the distance from the filling body beside the roadway to the fracture line at the end of...

Embodiment 2

[0038] On the basis of Example 1, combined with the mining of the 712 working face of a certain mine, the longwall mining method without coal pillars based on the 120 model will be further explained.

[0039] The 712 working face has a full height at one time mining, the thickness of the coal seam is 4m, and the strike length of the working face is 350m. ). According to the geological conditions, the thickness b of the old roof is determined to be 25.7m, the thickness of the immediate roof is 0.4m, the distance from the roadside filling body to the fracture line at the end of the rock beam on the old roof is 6m, and the span of the rock beam on the old roof is 30m. The crushing expansion coefficient of gangue is taken as 1.3. According to the mining conditions, the design width a of the wide roadway is 8m, and the roadway height h is 3m.

[0040] Calculate the predicted value h of the maximum possible subsidence of the roof of the gob-side entry L :

[0041]

[0042] h ...

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Abstract

The invention provides a non-coal-pillar longwall mining method based on 120 mode, and relates to the technical field of coal mining. The method comprises the following steps: A, the maximum subsidence of a roof of gob-side entry retaining is calculated; B, a mining roadway is excavated and supported, and width of the mining roadway is larger than 8 m; C, a continuous supporting wall is constructed in the middle of the width of the mining roadway along with heading of roadway excavation, the supporting wall divides the mining roadway into a first mining roadway and a second mining roadway, andthe upper part of the supporting wall is of a flexible structure and the lower part is of a rigid structure; D, a cut is opened, a working face is arranged, and anchor rods and anchor cables in the first mining roadway are uninstalled 10-20 m ahead of the working face; E, with pushing mining of the working face, the roof of the first mining roadway collapses, and the second mining roadway becomesa transportation roadway of the next working face; and F, steps B-E are repeated. According to the method, the wide roadway is excavated and divided into two roadways, and one working face is arranged without leaving coal pillars, so that the issue of stressful mining connection is alleviated.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a coal pillar-free longwall mining method based on the 120 mode. Background technique [0002] Coal pillar-free mining technology is an important change in coal mining and mining roadway support technology. Coal pillar-free mining is of great significance to relieve continuous tension, improve comprehensive economic benefits, prolong mine life, improve social benefits, and increase coal recovery rate. The traditional coal pillar-free technology is mainly divided into gob-side entry retention, top-cutting entry and top-caving entry entry and so on. [0003] The existing gob-side entry retaining is to build a separation wall behind the coal mining face, and the construction process is complicated, and the mining of the working face and the construction of the entry retaining interfere with each other, which affects the mining speed of the working face and the speed of retaining...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18E21F17/103
CPCE21C41/18E21F17/103
Inventor 郝建陈安法张延伟边华赵德法张培哲刘豪杰宋立新魏启振赵启政王兆旭
Owner SHANDONG UNIV OF SCI & TECH
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