Influence of Geo-stress on Dynamic Response Characteristics of Coal and Gas Outburst
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ORIGINAL PAPER
Influence of Geo‑stress on Dynamic Response Characteristics of Coal and Gas Outburst Bin Zhou1 · Jiang Xu1 · Shoujian Peng1 · Fazhi Yan1 · Wei Yang2 · Liang Cheng1 · Guanhua Ni3 Received: 28 November 2019 / Accepted: 19 May 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract The influence of tectonic, geostatic, and mining stresses on coal and gas outburst (CGO) becomes more obvious with increasing mining depth. The limitations of general experimental methods and test systems hinder the direct observation and characterization of the dynamic responses of the multi-physical parameters associated with CGO. In this study, a custommade large-scale physical simulation test system was used to study the characteristics of outburst evolution under different geo-stress levels, to overcome dynamic disasters in coal mines. The intensity and initial velocity of the outburst coal flow increased with increasing geo-stress. The geo-stress changes and gas pressure released during the outburst process mainly manifested in the relief and abutment stress zones, while the release of the elastic strain energy manifested in the abutment stress zone. This showed that the sphere of influence of the change on the physical parameters, such as the geo-stress, gas pressure, and elastic strain energy, is important for setting the drilling depth in measures to eliminate outburst. Interestingly, there seems to be a mechanism that suppresses the excess energy released during the outburst process, such that the solid–gas ratio of the two-phase outburst flow does not increase with increasing initial geo-stress. The dynamic outburst phenomenon is not completely positively correlated with increasing geo-stress. The mechanism causes cyclical fluctuations in the geo-stress, elastic strain energy, and gas pressure during the CGO process and pulse characteristics of the outburst coal flow simultaneously. Keywords Outburst · Geo-stress · Gas pressure · Elastic strain energy · Dynamic disaster
1 Introduction
* Shoujian Peng [email protected] Bin Zhou [email protected] Fazhi Yan [email protected] 1
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
2
Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
3
College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Worldwide coal production increased by 250 Mt in 2018, an increase of 3.3%. This growth can be significantly attributed to the 4.5% increase in coal production in China (International Energy Agency 2019). More than 90% of China’s coal production comes from underground mining, with about 53% of the total coal resources located 1000 m or deeper (Xie et al. 2019). With the depletion of shallow coal resources in recent years, mining operations are progressing deeper at a rate in the range of 10–20 m (highest: 50 m) per year (Wang et al. 2018a, b,
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