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Method for precracking of thick hard difficult-to-break coal mine top board by supercritical CO2

A supercritical, coal mine technology, applied in ground mining, earthwork drilling, underground mining, etc., to avoid dynamic disasters, reduce the area of ​​overhanging roofs, and ensure safe production.

Active Publication Date: 2015-07-08
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, supercritical CO 2 There are few reports on the application of pre-splitting technology in the field of coal mining technology (especially in the aspect of advanced pre-splitting of thick, hard and difficult-to-break roofs in coal mines)

Method used

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  • Method for precracking of thick hard difficult-to-break coal mine top board by supercritical CO2
  • Method for precracking of thick hard difficult-to-break coal mine top board by supercritical CO2
  • Method for precracking of thick hard difficult-to-break coal mine top board by supercritical CO2

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Embodiment Construction

[0039] The following examples are intended to illustrate and explain the present invention, but not to limit the scope of the present invention.

[0040] In order to have a clearer understanding of the technical objectives, features and effects of the present invention, the supercritical CO2 The pre-splitting fine-grained sandstone roof with a thickness of 10.1m, Platinum hardness f=8-9, dense distribution and good integrity in a mine of Lu'an Group will be further explained in detail.

[0041] The No. 3 coal seam in a mine of Lu'an Group is stable, with an average thickness of 5.6m, a dip angle of 3.5°, a buried depth of 506.15m, a strike length of 1536m, and a dip length of 240m. At present, the No. 3 coal seam adopts the longwall retreating fully mechanized caving mining method. The immediate roof of the No. 3 coal seam is gray-black argillaceous sandstone with a thickness of 2.56m and a Platinum hardness of f=3-4, and relatively well-developed vertical fissures; the basic ...

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Abstract

The invention discloses a method for precracking of a thick hard difficult-to-break coal mine top board by supercritical CO2, and belongs to the technical field of coal mine safe mining. According to the method, the characteristics of high density, low viscosity, high diffusion and strong breaking capacity and the like of the supercritical CO2 are fully used for realization of advance precracking of the thick hard difficult-to-break coal mine top board, CO2 industrial emissions can be reduced, the cycle of CO2 utilization can be realized, the cost of advance precracking can be reduced, the hanging top area of the thick hard difficult-to-break coal mine top board can be reduced, first / periodic weighting step and ground pressure strength can be reduced, dynamic disaster caused by thick hard top board instantaneous caving during full-mechanized caving mining can be effectively avoided, and safety in production can be ensured.

Description

technical field [0001] The invention belongs to the technical field of coal mining, in particular to a supercritical CO 2 A method for pre-splitting coal mines with thick and hard roofs. Background technique [0002] Coal mine hard roofs with large thickness, high strength, compact structure and good integrity exist widely in many mining areas in my country. When fully mechanized caving mining of thick and extra-thick coal seams, the thick and hard roof of the stope cannot collapse in time. With the gradual advancement of the working face, the suspended area of ​​the thick, hard and difficult roof of the stope will gradually increase, which will inevitably increase the difficulty of supporting the working face of the stope; at the same time, the initial / period The pressure step is very large, and it will accumulate a large amount of energy with the gradual advancement of the working face. When the self-weight of the thick and hard roof of the stope and the load of the over...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21B43/26
CPCE21B43/26E21C41/18
Inventor 冯国瑞白锦文张玉江章敏戚庭野周小建郭峰康立勋
Owner TAIYUAN UNIV OF TECH
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