ALGORITHM DEVELOPMENT FOR PREPARATORY WORKINGS METHANE INFLOW CALCULATION IN ORDER TO CLARIFY THE COAL SEAM GAS-DYNAMIC ACTIVITY CONTROL METHOD
Journal Title: Вестник научного центра по безопасности работ в угольной промышленности - Year 2018, Vol 0, Issue 3
Abstract
The article is devoted to the algorithm development for the preparatory workings quasi-static methane infl ow calculation. Preparatory workings advance causes a change in the gas geomechanical state in the face area of the coal seam, since the stresses are determined by the sum of gas and geostatic pressures. The quality of control over these changes directly affects the safety of mining operations, especially on high-gas-containing coal seams. Scientists in the fi eld of mining have created a variety of methods for monitoring gas and gas dynamic danger of a coal seam during the preparatory opening heading (the method of the current forecast of sudden outburst hazard), including no face contact methods of control and forecasting (geophysical). The presented algorithm is able to supplement the methods based on the analysis of the coal seam gas-kinetic characteristics, signifi cantly improving the quality of their evaluation criteria. At the moment, the defi nition of quasi-static methane infl ow is performed either experimentally as information becomes available during production, which, under constantly changing conditions, is diffi cult to perform, or is calculated at the design stage by a "single value" for the entire opening. Special attention is paid in the article to the moment of maximum stress changes during preparatory work (during cutting a fresh layer by a heading combine), since this is the moment to which the maximum gas infl ow into the opening also corresponds. The developed algorithm is based on modern concepts of methane content in coal and semi-empirical dependencies, describing the geomechanical state in the near-boundary part of the seam. This algorithm allows calculating the methane infl ow of the opening depending on the geological and technological conditions for carrying out preparatory openings.
Authors and Affiliations
M. S. Plaksin
Keywords
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