Minieiev S. P. The unloading zone and its impact on the safe mining of outburst-hazardous coal seams

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Parent Category: Geo-Technical Mechanics, 2022

Category: Geo-Technical Mechanics, 2022, Issue 163

Geoteh. meh. 2022, 163, 16-32

https://doi.org/10.15407/geotm2022.163.016

 

THE UNLOADING ZONE AND ITS IMPACT ON THE SAFE MINING

OF OUTBURST-HAZARDOUS COAL SEAMS

Minieiev S. P.

Institute of Geotechnical Mechanics named by M. Poljakov of National Academy of Sciences of Ukraine

UDC 622.831                                          

Language: English

Abstract. The development of outburst-hazardous coal seams is regulated by a number of normative documents that allow correct estimating of the parameters of the unloading zone in the face area part of the seam; therefore, there is no possibility of safe development of outburst-hazardous seams.
The purpose of the research is to substantiate the main parameters of the unloading zone, to clarify its parameters for the safe mining of outburst-hazardous coal seams.
Speaking about the actual hazard of gas-dynamic phenomena (GDP), as practice shows, none of the methods for predicting or assessing the size of the unloading zone, including the newly developed ones, can speak with 100% reliability about its implementation or its type. In the article, the author analyzes the results of determining the size of the unloading zone by various methods of controlling the effectiveness of the measures taken and the hazards of coal extraction in this zone. When discussing the results obtained, the definition of the unloading zone as a degassed part of the rock massif with destroyed or squeezed coal was formulated. As it is established, in this zone, it is possible to extract coal to a given depth without performing anti-outburst measures with the possibility of adjusting the size of the extraction by the depth of the unloading zone, taking into account the uneduced advance. The size of the unloading zone is determined by the settling time of the face, taking into account the stress-strain state (SSS), physical and mechanical properties (PMP), geological factors and the technology of massif destruction. The size of the unloading zone can be changed depending on the technological factor (extraction technology). For example, during fast extraction by a plough, the zone does not have time to form, i.e. when the plough (combine) either takes out a strip along the entire length of the long wall or cuts forward by 2-3 m.
The performed studies established the fact of formation of the unloaded zone in the face area part of the seam. The time interval of formation of the unloading zone is from 1 hour to 3 hours in case of mechanized coal extraction and up to 24 hours in case of blasting mining of coal, which is practically used in regulating the duration of technological processes. The unloading zone on outburst-hazardous seams varies from minimum sizes near zero to several meters.
Keywords: outburst hazard, gas-bearing, unloading zone, coal seam, prediction, efficiency control.

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About author:

Minieiev Serhii Pavlovych, Doctor of Technical Sciences (D.Sc.), Professor, Head of the Department of Pressure Dynamics Control in Rocks, Institute of Geotechnical Mechanics named by N. Poljakov of the National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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