Method for deep hole blasting in coal face

Abstract

A method for deep-hole blasting in coal face includes such steps as constructing test hole in coal face, testing drilling cuttings discharge during drill pipe drill operation, and taking the depth X at the maximum cuttings discharge as the position of leading stress peak in coal face, setting the drill cuttings discharge depth X at the top of drill cuttings discharge, and setting the drill cuttings discharge depth X at the bottom of drill pipe drill operation. B, the blasting hole is arranged parallel to the test hole, and the hole depth of the blasting hole is X determined in the step a; (c)load a plurality of explosive rolls and detonator into a detonation cylinder; (d) feed that detonator into the bottom of the hole according to the conventional charge method, lead out the gun line, and sealing the hole at the position of the hole; E, in accordance with b-(d) sequentially construct other blasting hole on that working surface and loading explosives; F. The connected gun line is mounted on the detonator, and the detonation is carried out by conventional method. The invention sets the blasting hole depth according to the working face stress peak position, and after the working face deep hole blasting, the stress peak position is pushed to the rear of the working face, so as to reduce the coal and gas outburst risk in the mining process of the working face.

Description

technical field [0001] The invention relates to a deep hole blasting method in a coal mining working face, which is especially suitable for preventing and controlling the coal and gas outburst in a coal seam working face with a risk of coal and gas outburst, and belongs to the technical field of gas drainage. Background technique [0002] Rock burst is a world-class scientific problem in the field of coal mine underground engineering and rock mechanics, which seriously threatens mine safety production. In the process of prevention and control of rock burst in coal mines in my country, the "four-in-one" comprehensive anti-scouring measures of prediction, prevention, inspection and safety protection are implemented. Risk prediction is the premise and prevention is the key. At present, the pressure relief and permeability enhancement measures commonly used in gas drainage mainly include deep hole controlled blasting, hydraulic slotting, hydraulic fracturing, coal seam water inj...

AI Technical Summary

Problems solved by technology

However, due to the different geological conditions and mining methods of each mine, even if the blasting parameters of different working faces of the mine are unified, it cannot be generally used, and the blasting effect is mainly affected by the coal seam thickness and mining depth. How to accurately select the optimal blasting scheme is always a difficult problem in the existing technology, especially for deep coal mines with high ground stress, complex environment, dangerous blasting construction, and large charge is likely to cause serious impact disasters

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