Coal face ultra-deep hole blasting roof cutting pressure relief control method and blasting charge structure

Abstract

The invention discloses a coal face ultra-deep hole blasting roof cutting pressure relief control method and a blasting charge structure. The control method comprises the following steps of firstly, conducting the measurement and calculation of an overlying rock key layer, and determining the position of the key layer of ultra-deep hole blasting roof cutting. On the basis, a series of technologiesof kilometer drilling machine directional drilling, blasting area reinforced supporting, shaped charge pipe charging and directional blasting, double detonating fuse whole-course laying and large-length hole sealing are adopted in a coal face groove, and ultra-deep hole presplit blasting directional fracturing is implemented, so that overlying rock roof cutting pressure relief is achieved in front of a mining stopping line, transmission of mining support pressure caused by coal mining work is blocked, the effect of protecting a roadway in front of the coal face is achieved, and the problem ofsurrounding rock control of a roadway subject to dynamic pressure is effectively solved.

Description

technical field [0001] The invention relates to the technical field of mine pressure and rock formation control, in particular to a pressure relief control method and a blasting charge structure for ultra-deep hole blasting in a coal mining face. Background technique [0002] At present, the mining depth of coal resources is increasing day by day, and the maximum mining depth has reached 1500m. The increase in mining depth leads to increasing in-situ stress, and the difficulty of controlling the surrounding rock of the roadway increases sharply, especially the roadway affected by mining. , Under the action of concentrated stress of mining for a long time, it is extremely difficult to control the surrounding rock of the roadway. [0003] In order to control the deformation of the roadway under the deep dynamic pressure, the pressure relief control technology based on the surrounding of the roadway or the active support technology combining high-strength bolts and cables with ...

AI Technical Summary

Problems solved by technology

However, there are still the following problems in the current control technology of blasting roof cutting and pressure relief in coal mining face: ① When drilling and blasting between the working face frames is used, although the drilling depth is small, the space is small and the construction is difficult, and the blasting operation may cause Problems such as coal wall slabs and end face roof fall are poor in safety; ② When drilling and blasting in a special process roadway in front of the working face, although the drilling depth is small, the excavation work volume is large, which is unreasonable economically, and the excavation system Mutual interference increases the complexity and potential safety hazards of the production system; ③ When drilling and blasting in the trench along the coal mining face is used, the interference to the operation of the coal mining face is small and the safety is better, but it needs to be drilled deeper Drilling, when the drilling is drilled from both sides of the coal mining face along the groove, the maximum hole depth can reach 80-120m, which belongs to ultra-deep hole blasting, and there are technical bottlenecks of "difficult to charge, difficult to seal, and easy to resist blasting"

Images