A Monitoring Investigation into Rock Burst Mechanism Based on the Coupled Theory of Static and Dynamic Stresses
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ORIGINAL PAPER
A Monitoring Investigation into Rock Burst Mechanism Based on the Coupled Theory of Static and Dynamic Stresses Wu Cai1,2,3 · Xianxi Bai1 · Guangyao Si4 · Wenzhuo Cao3 · Siyuan Gong1 · Linming Dou1 Received: 12 December 2019 / Accepted: 25 August 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Coal is the major energy resource in China, but the recovery of coal is constantly under the threat of rock bursts, which has been impeding safe and highly efficient coal production for decades. A better understanding of the rock burst mechanism and its monitoring and management strategies is critical to improving coal extraction efficiency with an improved health and safety environment. In this paper, rock burst mechanism was further investigated based on the hypothesis of coupled static and dynamic stresses, in which mining-induced abutment stresses were considered as the major component of the static stresses while the dynamic stresses were categorised into two types (seismic-derived and impact-derived dynamic stresses). Subsequently, on-site monitoring strategies, including microseismic (MS) monitoring, hydraulic support pressure (HSP) monitoring and seismic velocity tomography (SVT), were implemented to understand the responses of mining-induced static and dynamic stresses. To be specific, four estimation methodologies were proposed for quantitatively assessing velocityderived static stress, seismic-derived static stress, seismic-derived dynamic stress, and impact-derived dynamic stress. These monitoring strategies have been implemented in a Chinese coal mine to understand the mechanism of a rock burst incident. Keywords Rock burst mechanism · Coupled static and dynamic stresses · Microseismic monitoring · Hydraulic support pressure monitoring · Seismic velocity tomography List of Symbols MS Microseismic HSP Hydraulic support pressure SVT Seismic velocity tomography 𝜎s , 𝜎d , 𝜎g Static stress, dynamic stress and gas pressure
* Wu Cai [email protected] * Guangyao Si [email protected] 1
Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention, School of Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
2
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
3
Department of Earth Science and Engineering, Royal School of Mines, Imperial College London, London SW7 2AZ, UK
4
School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia
𝜎bmin Critical stress for the initiation of rock bursts or coal and gas outbursts 𝜎vss , 𝜑𝜎vss Velocity-derived static stress and its concentration coefficient 𝜎sds , 𝜑𝜎sds Seismic-derived dynamic stress and its concentration coefficient 𝜎sss , 𝜑𝜎sss Seismic-derived static stress and its concentration coefficient 𝜎Ids , 𝜑𝜎Ids Impact-derived dynamic stress and its concentration coefficient 𝜎sdsa , 𝜎sssa Mean values of 𝜎sds and 𝜎sss 𝜎sdsi , N𝜎sd The σsd
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