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Hard coal seam mining method for balancing energy induced plastic damage and preventing and controlling dynamic damage and experimental device

A technology that induces plasticity and coal seam, applied in the direction of applying repeated force/pulsation force to test the strength of materials, ground mining, earth square drilling, etc., can solve problems such as dynamic damage and pick wear, so as to avoid dynamic damage and increase service life , The effect of increasing the speed of coal mining

Active Publication Date: 2019-06-21
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention solves the problem that the existing hard coal seam mining method is likely to cause serious wear of the pick and the problem that it is easy to cause dynamic damage

Method used

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  • Hard coal seam mining method for balancing energy induced plastic damage and preventing and controlling dynamic damage and experimental device
  • Hard coal seam mining method for balancing energy induced plastic damage and preventing and controlling dynamic damage and experimental device
  • Hard coal seam mining method for balancing energy induced plastic damage and preventing and controlling dynamic damage and experimental device

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Experimental program
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specific Embodiment approach 1

[0037] A hard coal seam mining method that balances energy-induced plastic failure and prevents dynamic failure, comprising the following steps:

[0038] Step 1. An array of energy compensation holes is set on the mining face of the hard coal seam, namely: the energy compensation holes are arranged in rows and columns, and the energy compensation holes arranged in rows and columns form an array; an energy compensation device is arranged in each energy compensation hole, The energy compensation device includes a heating device and a refrigeration device; according to the energy compensation hole array, the coal wall is divided into several coal wall units corresponding to the energy compensation hole array;

[0039] The energy distribution of the coal wall is monitored by setting a rock burst monitoring system, and stress collection holes are arranged in each coal wall unit. The stress collection holes are arranged in rows and columns, and the stress collection holes arranged in...

specific Embodiment approach 2

[0052] Embodiment 2: The coal seam brittleness energy value of different hard coal seams is different, which is related to the hardness of the mined coal seam, so the coal seam brittleness energy value needs to be determined through experiments. The determination process of the coal seam embrittlement energy value described in the present embodiment is as follows:

[0053] According to Part 7 "Measurement of Uniaxial Compressive Strength and Calculation Method of Softening Coefficient (GB / T 23561.7-2009)" of "Measurement Methods of Physical and Mechanical Properties of Coal and Rock", the coal samples of hard coal seams were collected and made into 50×50×100mm The standard sample is subjected to a pressure test; when the standard sample cracks, such as figure 1 The coal sample shown, according to the test applied pressure F and crack displacement s 1 Get the coal seam brittle fracture energy value Q 1 =∫Fds 1 , where the crack displacement s 1 is the corresponding displace...

specific Embodiment approach 3

[0057] The determination process of the coal seam embrittlement energy value described in the present embodiment is as follows:

[0058] According to Part 7 "Measurement of Uniaxial Compressive Strength and Calculation Method of Softening Coefficient (GB / T 23561.7-2009)" of "Measurement Methods of Physical and Mechanical Properties of Coal and Rock", the coal samples of hard coal seams were collected and made into 50×50×100mm The standard sample is subjected to a pressure test. When the standard sample cracks, the pressure F and the crack displacement s applied according to the test 1 Get the brittle fracture energy value Q 1 =∫Fds 1 , where the crack displacement s 1 is the corresponding displacement from when the pressure loading device contacts the standard sample to when the standard sample cracks;

[0059] Carry out several groups of experiments, and take the smallest brittle energy value among the brittle energy values ​​obtained by several groups of experiments as th...

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Abstract

The invention discloses a hard coal seam mining method for balancing energy induced plastic damage and preventing and controlling dynamic damage and an experimental device, belongs to the technical field of coal mining, particularly relates to a hard coal seam mining method and an experimental device, and aims to solve the problems that cutting teeth are seriously abraded and power damage is easily caused in the existing hard coal seam mining method. An energy compensation hole array is arranged on a mining surface of a hard coal seam, an energy compensation device is arranged in each energy compensation hole; a rock burst monitoring system is arranged to monitor the energy distribution of the coal wall, before coal seam mining, the energy conditions of a plurality of coal wall units of the coal wall are detected in real time through the arranged rock burst monitoring system, an energy distribution array is correspondingly generated, the average energy value of the energy distributionarray is calculated, energy distribution adjustment is carried out, and therefore mining of the hard coal seam is achieved. The method is suitable for hard coal seam mining.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to an energy-balanced hard coal seam mining method and an experimental device. Background technique [0002] The coal body is a product formed by the long-term accumulation of geological structure changes. Generally, the occurrence conditions of coal are relatively complicated. The increase of the three-dimensional stress is not equal (σ 1 ≠σ 2 ≠σ 3 ) and is getting bigger and bigger, the stress on the upper part of the coal seam and on both sides may present x-type, y-type, z-type and their composite stress fields, forming a corresponding energy field. Extremely hard coal seams (5.0 > firmness coefficient ≥ 4.0) and hard coal seams (4.0 > firmness coefficient ≥ 3.0) have relatively high reserves in my country and are widely distributed. Hard coal seams can easily store a large amount of energy and are easy to Induce power disasters. [0003] In the process...

Claims

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Application Information

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IPC IPC(8): E21C41/18G01N3/08G01N3/32
Inventor 李英明刘刚黄顺杰赵呈星张若飞程详
Owner ANHUI UNIV OF SCI & TECH
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