Method for preventing and treating rock burst through deep-hole pressure release blasting

Abstract

The invention discloses a method for preventing and treating rock burst through deep-hole pressure release blasting. The method comprises the steps that firstly, two stress concentration areas on the two sides are determined, and that is, the bust starting areas where the rock burst is possible to occur; secondly, single-row blast holes perpendicular to the axial direction of a roadway are symmetrically drilled in the two sides of the roadway, the depth of each blast hole at least reaches a bearing pressure peak area, the loaded length and a central detonating point approximate a peak stress position, and the loading mode is a non-coupling spaced loading mode; thirdly, PVC casing pipes are adopted to assist in loading and uniformly distributed to be three sections in each blast hole, a detonator is installed on each blasting cartridge, and the blast holes are sealed through clay; fourthly, detonator connecting wires in the same blast hole are connected in series, a net formed by connecting the detonator connecting wires in both the blast holes in series is in parallel connection with a leading wire to switch in a blasting machine; and finally, blasting operation is conducted through the blasting machine. According to the method for preventing and treating the rock burst through deep-hole pressure release blasting, the blasting energy can be utilized sufficiently, by carrying out pressure release blasting on the bust starting areas of the roadway sides where the rock burst is possible to occur, and the purpose that the danger level of the roadway rock burst is reduced is achieved.

Description

technical field [0001] The invention relates to a method for preventing and controlling rock burst, in particular to a method for preventing and controlling rock burst by deep hole pressure relief blasting, and belongs to the technical field of coal mining. Background technique [0002] With the increase of coal mining depth, the complexity of the deep mechanical environment and the change of the mechanical properties of coal and rock make various dynamic disasters occur frequently in the process of coal mining, and rock burst is one of the more typical ones. [0003] Rockburst is one of the most serious natural disasters in deep mining of coal mines. When coal mines are mined to a certain depth, under the joint action of ground stress, mining stress and structural stress, the working face of the mine will be affected by rockbursts to varying degrees. Coupled with the impact tendency of the coal seam itself, as well as the influence of mining technology and geological factor...

AI Technical Summary

Problems solved by technology

[0006] Although the deep hole blasting method has a good effect on preventing rock burst, there are still the following problems: First, the unreasonable depth of the blast hole leads to serious deformation of the roadway, damages the integrity of the surrounding rock, causes the two sides to be frustrated, and the roof sinks; The second is the unreasonable charge structure, resulting in low utilization rate of blasting energy, which not only cannot effectively relieve the hazard of rock burst, but even promotes the occurrence of rock burst

Images