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A method for determining loosening blasting danger-relieving range of coal beds with rock burst

A technology for ground pressure shock and coal seam, which is applied in blasting, earth-moving drilling, mining equipment, etc., and can solve problems such as lack of research results, difficulty in accurately determining the blasting pressure relief range, and difficulty in accurate calculation.

Inactive Publication Date: 2015-03-04
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0009] At present, there are two main methods to determine the range of blasting pressure relief: one is to calculate by theoretical empirical formula, but the theoretical calculation method is relatively abstract, and it is difficult to accurately calculate according to the actual situation on site, so it can only be used as a qualitative reference
The other is the method of numerical simulation. There are currently some researches on the numerical simulation method. The software used includes FLAC, RFPA and other software. Using this software can not really simulate the blasting effect of explosives, and can only approximate the use of stress waves instead of explosives. Stress distribution inversion blasting effect, and some results use LS-DYNA dynamic software, which can simulate the blasting effect of explosives, but there are no systematic research results on different drilling and explosive related parameters, and there is no analysis of adjacent drilled holes Influence of Crack Propagation During Simultaneous Blasting or Differential Blasting
It is difficult to accurately determine the pressure relief range of blasting by purely using theoretical analysis and numerical methods

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  • A method for determining loosening blasting danger-relieving range of coal beds with rock burst
  • A method for determining loosening blasting danger-relieving range of coal beds with rock burst
  • A method for determining loosening blasting danger-relieving range of coal beds with rock burst

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Embodiment Construction

[0021] Hereinafter, the invention will now be described more fully with reference to the accompanying drawings, in which various embodiments are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0022] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0023] Based on the drilling diameter of 42mm, the drilling length of 15m, and the coal mine ammonium nitrate explosive as the explosive, the specific "trinity" blasting loosening range determines three parts:

[0024] (1) Theoretical calculation. Refer to the theoretical calculation formula in some research results to calculate the blast crack distribution radius. For exa...

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Abstract

The invention relates to a method for determining loosening blasting danger-relieving range of coal beds with rock burst, the method including: (1) theoretical calculation: calculating the specific drilling diameter and the fracture zone diameter on the condition of specific explosive parameters in accordance with site information and experience formulas, primarily determining the radius r of blasting pressure relief; (2) numerical simulation: simulating the drilling diameter and the fracture zone diameter on the condition of explosive parameters, which are identical to those in the theoretical calculation, by LS-DYNA dynamic simulation software and studying the influence of the blasting of the two drilling holes on the fracture zone and the distribution radius r; (3) on-site ultra-sonic test of the blasting fracture zone and verification.

Description

technical field [0001] The invention is used for determining the blasting pressure relief range when the blasting pressure relief mode is adopted for the coal seam with the risk of rock burst to relieve the danger of the shock. [0002] Rockburst is a typical mine dynamic disaster in underground coal mines. It is mainly manifested in the sudden and violent release process of elastic strain energy accumulated in the coal and rock mass, and the coal body is thrown out dynamically from the two sides of the roadway and the roof and floor, causing roadway Or the instantaneous failure of the working face, its sudden and violent failure characteristics pose a great threat to the safety of coal mines, especially with the increase of coal mining depth, the problem of rock burst is becoming more and more prominent. [0003] At present, when coal seams with dangerous rockbursts are mined, predictions and risk relief measures are often carried out, and the method of blasting is an importa...

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Application Information

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IPC IPC(8): E21F17/00F42D3/00
CPCE21F17/00F42D3/00
Inventor 徐学锋刘少伟李宝富司亮庞龙龙张浩李正可张孝明陈召辉
Owner HENAN POLYTECHNIC UNIV
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