A static rock breaking method for deep holes in coal mines

Abstract

The invention provides a deep hole static rock breaking method for an underground coal mine. According to the deep hole static rock breaking method provided by the invention, according to the Protodikonov's hardness coefficient of a broken rock body, main holes and auxiliary holes are distributed in the broken rock body in different structures, parameters of the main holes and the auxiliary holes includes apertures, hole distances, hole depths and hole angles, the main holes is filled with a blasting agent by virtue of a grouting method or an explosive rolling method, the main holes are sealed, the auxiliary holes is not filled with the blasting agent, and the auxiliary holes serve as artificial free surfaces to release swelling pressure and can guide the generation and the development of a crack; with the arrangement of the multi-row holes, the main holes and the auxiliary holes are distributed at intervals with equal distances. The deep hole static rock breaking method can be used for solving the problem that of the blasting agent is used for carrying out deep hole rock breaking on a natural rock body in a triaxial stress state in the underground coal mine, is safe, mild, controllable and effective and is particularly suitable for high gas mines.

Description

Technical field [0001] The invention relates to a deep-hole static rock breaking method, in particular to a deep-hole static rock breaking method for natural rock masses under triaxial stress in underground coal mines. Background technique [0002] In underground coal mining, although the degree of mechanization has been greatly improved, due to geological conditions or production needs, deep holes are often required to break the rock. For example, deep-hole blasting weakens the hard roof of the open cut in the pre-splitting fully mechanized caving face, reducing the initial pressure step of the old roof; advanced deep-hole pre-blasting in the roadway to relieve the pressure of the roof. At present, the deep-hole rock breaking methods used in underground coal mines include deep-hole drilling and explosive blasting and the use of deep-hole injection of high-pressure water to expand and soften the rock. However, in some specific applications, these two methods have potential safet...

AI Technical Summary

Problems solved by technology

Explosives explode instantly, and the gas expands to break rocks. The process is not easy to control. The huge energy released by explosives explodes instantly produces violent vibrations. Sometimes the ground can feel the shock, which will cause certain damage to buildings and structures in coal mines and on the ground. Explosive explosions Shock waves and flying rocks are generated in an instant, which may collapse and damage surrounding supports and equipment, causing casualties. Such incidents happen from time to time; explosive rock breaking will also produce dust, gun smoke and other toxic and harmful gases, which will deteriorate the underground production environment and endanger Workers are in good health; what is more serious is that there may be unpredictable hidden dangers such as blind shots, residual explosions, and deflagration when explosives break rocks.

Images