A method of gangue filling assisting working face retraction at the final mining stage

A working face and stage technology, applied in the direction of filling, mining equipment, earth cube drilling and mining, etc., can solve the problems of difficult retraction of the working face at the final mining stage, waste rocks occupying space to pollute the environment, waste rocks occupying space to pollute the environment, etc., to achieve The effect of shortening the moving cycle, realizing multi-point operations, and increasing the speed of withdrawal

Active Publication Date: 2020-05-15
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problems that gangue stacking occupies space to pollute the environment and it is difficult to withdraw the working face at the end-mining stage, and provides a method for assisting the retraction of the working face at the end-mining stage by gangue filling
This method is mainly to maintain the stability of the roof at the final mining stage to ensure the safety of withdrawal and the secondary utilization of coal gangue in the mine. The roof subsides during withdrawal to realize green mining

Method used

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  • A method of gangue filling assisting working face retraction at the final mining stage
  • A method of gangue filling assisting working face retraction at the final mining stage
  • A method of gangue filling assisting working face retraction at the final mining stage

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Example 1, prefabricated block filling assists the retreat of the working face at the final mining stage.

[0038] Firstly, waste coal gangue is used to prepare prefabricated blocks for filling, and maintenance is carried out in advance, and its uniaxial compressive strength is tested to ensure that its strength is greater than the strength of the coal body mined in the working face, and then packaged and stored for use.

[0039] When the working face advances to the final mining stage, the prefabricated blocks are put down from the auxiliary shaft through the mine car to the yard at the bottom of the shaft, and then sent to the section return air level roadway through the main transport stone gate, and sent to the coal mining face by the belt conveyor, and finally Masonry of prefabricated blocks is carried out through the improved cover beam.

[0040] Prefabricated blocks shall be laid in ladder form before hanging net support in the impact stage of final mining, and t...

Embodiment 2

[0043] Embodiment 2, prefabricated block filling combined with a single pre-excavation withdrawal channel assists the withdrawal of the working face at the final mining stage.

[0044] Firstly, waste coal gangue is used to prepare prefabricated blocks for filling, and maintenance is carried out in advance, and its uniaxial compressive strength is tested to ensure that its strength is greater than the strength of the coal body mined in the working face, and then packaged and stored for use.

[0045] Before the start of mining at the working face, the coal body of the mining line is stopped, and a retraction channel is excavated near the side of the working face, and the surrounding rock is supported by bolts and anchor cables, and the construction of the single retraction channel is completed. .

[0046] When the working face advances to the final mining stage, the prefabricated blocks are put down from the auxiliary shaft through the mine car to the yard at the bottom of the s...

Embodiment 3

[0050] Embodiment 3, prefabricated block filling combined with double pre-excavation withdrawal channels to assist the withdrawal of the working face at the final mining stage.

[0051] Firstly, waste coal gangue is used to prepare prefabricated blocks for filling, and maintenance is carried out in advance, and its uniaxial compressive strength is tested to ensure that its strength is greater than the strength of the coal body mined in the working face, and then packaged and stored for use.

[0052] Before the start of mining at the working face, the coal body of the mining line is stopped, and an auxiliary retraction channel is excavated near the side of the working face, and an interval of coal pillars is left between the side of the working face and the auxiliary retracting channel, and another channel is excavated As the main retracement channel, the main and auxiliary retracement channels are separated by a distance between the coal pillars to excavate the connecting roadw...

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Abstract

The invention relates to a work face withdrawal method in the end-mining stage with spoil helpful for filling, belongs to the technical field of mining safety, and aims at solving the problems that the waste rocks occupy space and pollute the environment and the working face is hard to withdraw in the end-mining stage. In the end-mining stage, coals are cut, a rack is moved and prefabricated filling blocks are placed in a step shape, the step shape can form a step-shaped slope, a maintenance structure is stable, it is ensured that the prefabricated blocks abut against the top while net hangingand support via anchor poles and cables, and slits among the prefabricated blocks are filled with concrete and thus the blocks are bonded into an integral body. Thus, settlement of a top plate can becontrolled effectively, and it is ensured that a fully mechanized device can be withdrawn smoothly and safely in the end-mining stage.

Description

technical field [0001] The invention belongs to the technical field of mining safety, and in particular relates to a method for assisting the retraction of a working face at the end-mining stage by gangue filling. Background technique [0002] In recent years, my country has become the country with the largest coal production in the world, and its annual production accounts for almost 50% of the world's total coal production. It has become the world's largest coal producer and consumer. Comprehensive mechanized mining is the main coal mining technology used in coal mines in my country and abroad. With the rapid development of comprehensive mechanized mining technology in my country in recent years, a large number of large mines with an annual output of 10 million tons have emerged. Many breakthroughs have been made in the development of mining equipment. In the mine production process, the succession of the working face is a necessary link. The relocation and reverse of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F15/06E21F15/00E21D11/10E21D11/15E21D20/00
CPCE21D11/10E21D11/152E21D20/00E21F15/005E21F15/06
Inventor 冯国瑞郭军李松玉任玉琦郭育霞闫勇敢钱瑞鹏孙强郝晨良
Owner TAIYUAN UNIV OF TECH
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