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Deep hole explosion top board attenuation method

A technology of deep hole blasting and roof, which is applied in blasting and other directions, can solve problems such as the weakening of the roof of deep hole blasting and the difficulty of preventing and controlling rock burst in mines, and achieve the goal of improving the condition of the working face, significant economic and social benefits, and preventing rock burst Effect

Inactive Publication Date: 2012-10-17
DATONG COAL MINE GRP
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AI Technical Summary

Problems solved by technology

[0003] The present invention provides a roof weakening method for deep hole blasting in order to solve the problem that existing mine rockburst prevention and control is very difficult under the conditions of hard roof, hard floor and hard coal seam

Method used

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Embodiment Construction

[0010] The roof weakening method for deep hole blasting includes the following steps: drilling a blast hole 5 in the roof 1 above the coal pillar 2 in advance, then filling the blast hole 5 with explosives, and finally implementing the blast. Several groups of horizontally evenly distributed deep holes drilled obliquely upward toward the roof 1, each group of deep holes includes two upper and lower blast holes 5, the vertical distance from the bottom of the upper blast hole 5 to the roof surface is 4.5m, and the lower side The vertical distance from the bottom of the blast hole 5 to the top plate surface is 3.5m, the depth of the blast hole 5 is 23m, the diameter of the blast hole 5 is 63mm, the charge length of the blast hole 5 is 3.0m, and the blockage length of the blast hole 5 is not Less than 10m, the distance between every two groups of blast holes 5 is 6m.

[0011] During the specific implementation process, a guide hole (6) parallel to the blast holes (5) and equal in ...

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Abstract

The invention provides a deep hole explosion top board attenuation method. The method solves a problem that it is difficult to control present rock burst under conditions of hard top board, hard base plate and hard coal seam. The deep hole explosion top board attenuation method comprises the following steps: firstly, punching a blast hole in a top board above coal pillar; then packing blasting powder into the blast hole; and lastly, carrying out explosion. According to the invention, an ingeniously-designed blast hole arrangement form, and reasonable explosion parameters are utilized, directly exploding and pressure relieving in stress peak value region are carried out to reach an aim of preventing rock burst, thereby occurrence frequency and energy value of the rock burst on working surface are greatly lowered. With the method, the working surface status is improved and the occurrence of the rock burst in roadway is avoided. The method creates favorable conditions for normal production of the mine, and the method possesses an especially substantial economy and social benefit.

Description

technical field [0001] The invention relates to a method for preventing and controlling rock burst used in coal mines, in particular to a roof weakening method for deep hole blasting. Background technique [0002] Rockburst is a form of mine pressure that suddenly breaks down in underground surrounding rocks, causing violent vibrations and throwing out a large number of coal (rock) blocks. It is a dynamic disaster that seriously threatens the safe production of coal mines. The power generated by the impact throws the coal and rock to the roadway, and at the same time makes a strong sound, causing the vibration of the coal and rock mass and the damage of the coal and rock mass, the damage of the support and equipment, casualties, and the collapse and damage of some roadways. At the same time, it will also cause or induce other mine disasters, especially gas and coal dust explosions, fires and floods, etc., which will interfere with the ventilation system and cause ground vibr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/08
Inventor 于斌田利军赵军李有春卢国梁王爱国陈涛王宏乔宁秦福利
Owner DATONG COAL MINE GRP
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