ORIGINAL RESEARCH
Dome-Basin Structure and its Influence on Coal and Gas Outbursts
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China University of Mining and Technology, Faculty of Resources and Safety Engineering, Beijing, China
Submission date: 2017-01-17
Final revision date: 2017-10-02
Acceptance date: 2017-10-03
Online publication date: 2018-02-27
Publication date: 2018-03-30
Corresponding author
Deyong Guo
Faculty of Resources and Safety Engineering, China University of Mining and Technology (Beijing), 1270 Secord Landing, T5T 4N4 Edmonton, Canada
Pol. J. Environ. Stud. 2018;27(4):1823-1831
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ABSTRACT
Coal and gas outbursts are extremely violent dynamic disasters. Geological structure is the primary
factor for controlling outbursts, and dome-basin structure is one of the most dangerous structural
types that are prone to cause outbursts. This study reveals the reasons for and characteristics of coal
and gas outbursts in a dome-basin structure. According to the analysis of the features and the formation
mechanism of a dome-basin structure, combining gas geology theory and gas geology parameters, coal
seam characteristics of stress and strain, coal-body structure, and coal seam gas occurrences in a domebasin
structure were studied. Based on the change laws of the above three aspects, the influences of domebasin
structure on coal and gas outburst was also further analyzed. The results show that the dome-basin
structure can be divided into three parts: dome structure, basin structure, and saddle structure. In the
saddle structure, the surrounding rock was greatly damaged and the elasticity of the rock strata increased.
It is easy to incur tectonic stress concentration. The type of coal-body structure is most of the mylonitic
coal of full-layer thickness, and decreased the destruction-resisting ability of a coal seam. Coal seam gas
content and pressure are relatively large, and provided beneficial conditions for the coal and gas outburst.
Because of these effects, the probability of coal and gas outbursts visibly increased in this area.