Method for Prevention and Control of Rockburst by Man-made Spatial Defects

A technology of rock burst and space, applied in ground mining, earth drilling, underground mining, etc., can solve problems such as insufficient energy release, achieve a wide range of energy release, and reduce the impact risk

Inactive Publication Date: 2011-12-28
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a new effective method for changing energy release and stress transfer in

Method used

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  • Method for Prevention and Control of Rockburst by Man-made Spatial Defects
  • Method for Prevention and Control of Rockburst by Man-made Spatial Defects

Examples

Experimental program
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Embodiment Construction

[0012] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0013] Step 1: After the mining system is formed in the working face, firstly delineate the dangerous areas of rock burst, and delineate the most dangerous areas such as figure 1 In the high stress area shown, in the high stress area, excavate a pressure relief roadway with a sectional area of ​​6-8m 2 , the pressure relief roadway runs through the high stress area, and this kind of pressure relief roadway is called a man-made space defect body; the pressure relief roadway is excavated by blasting, simple temporary support, monitoring, pressure relief and excavation at the same time;

[0014] Step 2: Drilling and blasting of roadway side body

[0015] After the excavation of the pressure relief roadway is completed, three head-on drilling holes with an elevation angle of 3-5° are drilled at the head of the excavation. The diameter of the head-on drilling holes ...

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Abstract

The invention discloses a method for preventing and controlling rockburst by an artificial space defect body. Firstly, one or more pressure relief roadways are excavated in the high stress dangerous area of ​​rockburst, and three boreholes are drilled in the head of the pressure relief roadway. The boreholes are drilled along the centerline of the roadway, and the holes on both sides are drilled obliquely forward at an angle of 30° based on the centerline of the roadway, so that the coal seam can be relieved by deep hole blasting; Drilling, and finally blasting from the head of the roadway to the back of the roadway. The invention changes the stress distribution by creating a large defect space in the high-stress coal body, the stress is far away from the roadway, the coal body around the roadway is destroyed, the energy is greatly released, and the risk of impact is fundamentally reduced.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] The prevention and control of rock burst is a world-class problem, and the mining of rock burst coal seams is often accompanied by the occurrence of destructive rock burst. At present, the prevention and control methods of such accidents are basically the same as the conventional prevention and control methods, mainly taking measures to relieve danger, including pressure relief by drilling and blasting, pressure relief by drilling and other measures. With the increase of mining depth, in the actual implementation of these conventional measures, due to defects such as difficult operation and small pressure relief space, the stress transfer is not in place, the energy release is not sufficient, the rock burst is difficult to control, and it is easy to occur high-level Larger energy releases, causing significant losses. When there is an abnormally high stress area...

Claims

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Application Information

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IPC IPC(8): E21C41/16
Inventor 潘立友
Owner SHANDONG UNIV OF SCI & TECH
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