Zberovskyi V.V., Chetveryk M.S., Vlasenko V.V., Zmiievska K.O., Dudlia K.Ye. Evaluation of the advanced degassing in the affected zones of deformation processes

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Parent Category: Geo-Technical Mechanics, 2022

Category: Geo-Technical Mechanics, 2022, № 161

Geoteh. meh. 2022, 161, 42-53

https://doi.org/10.15407/geotm2022.161.042

 

 EVALUATION OF THE ADVANCED DEGASSING IN THE AFFECTED ZONES OF DEFORMATION PROCESSES

¹Zberovskyi V.V., ¹Chetveryk M.S., ¹Vlasenko V.V., ¹Zmiievska K.O., ¹Dudlia K.Ye.

¹Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine

UDC 622.454.3

Language: English

Abstract. On the example of the results of experimental studies in the conditions of great depths of the mines of the Donetsk basin, the relationship between the parameters of advanced degassing and deformation processes in the roof rocks during the development of a coal seam is considered. The purpose of the work is to establish the efficiency of advanced degassing depending on the location of degassing wells in the zones of tension and compression of rocks in the undermined geological stratum. This article deals with the influence of technogenic processes that occur in the rock massive in front of the mine face and along the pillar of the previously worked out longwall. It was established that the process of technogenic formation of cracks in the overhanging mass during the drivage of the mine face occurs up to a certain height with the rate of transition of tensile strains into compressive strains. Along the pillar and above it to the zone of manifestation of the supporting rock pressure (compression deformation zone), an area (band) of influence of the tensile deformation zone and rock stratification is formed. In this part of the massif, free methane accumulates, which flows through man-made cracks from the compression zone to the extension zone. Ahead of the mine face, similar man-made processes take place. The replacement of compression zones by extension zones leads to intense filtration of free methane and its accumulation in the separation zones. When caving the block of the main roof, gas from the stratification zone is released into the goaf, of longwall. Wells located in compression deformation zones do not provide effective degassing of roof rocks. The wells located in the tensile deformation zone of the undermined massif have the highest flow rate and high methane concentration. With the repeated underworking of such wells, their efficiency and service life increase. It is recommended to apply advanced degassing of roof rocks by wells, which are located in rock tension zones on the border with goaf. The distance between degassing wells should be such that there is no or minimal technogenic and gas-dynamic connection between them. In the conditions we have considered, it should be 55-60 m.
Keywords: advanced degassing, dynamic shift trough (DST), deformation processes, zones of stratification.

 

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