Publishing House SB RAS:

Publishing House SB RAS:

Address of the Publishing House SB RAS:
Morskoy pr. 2, 630090 Novosibirsk, Russia



Advanced Search

Journal of Mining Sciences

2016 year, number 4

Geophysical Criterion of Pre-Outburst Crack Propagation in Coal Beds

A. V. SHADRIN
Kemerovo State University, ul. Krasnaya 6, Kemerovo, 650043, Russia
Keywords: показатель выбросоопасности, критерий развития трещин, спектрально-акустический метод, аппаратура аэрогазового контроля, напряженное состояние, прочностные характеристики угля, внутрипластовое давление газа, концентрация метана, outburst hazard index, crack propagation criterion, spectral-acoustic method, air-and-gas control equipment, stress state, coal strength characteristics, formation pressure, methane concentration

Abstract

The process of crack propagation in coal face area is considered as an informative sign of coal and gas outburst hazard. In the known condition of crack growth at a certain distance from coal face, it is suggested to replace mechanical parameters by geophysical data through application of different evaluation approaches: actual stresses-by spectral-acoustic method relative to amplitudes of high-frequency and low-frequency components of acoustic signal generated by mining machines in coal face area; formation pressure-by analysis of methane concentration in mine air in coal face area; strength of the most folded coal bed-by measuring strength based on penetration depth of a steel cone. The author analyzes the influence of acoustic, strength and permeability and porosity properties of coal face area on limit value of geophysical pre-outburst crack propagation criterion.