Study on Large Deformation Mechanism of Roadway with Close and Multi Coal Seam in Mining
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ORIGINAL PAPER
Study on Large Deformation Mechanism of Roadway with Close and Multi Coal Seam in Mining Yongsheng Bao . Dongfang Su . Hongwei Mu
Received: 13 October 2019 / Accepted: 4 October 2020 Ó Springer Nature Switzerland AG 2020
Abstract In view of the serious local deformation of roadway in close coal seam mining, the seismic computed tomography (CT) and spatio-temporal evolution of microseismic were comprehensively investigated in this study. The static coal load and dynamic load disturbance were used to reveal the local large deformation mechanism of the mining roadway with coal pillars in close and multi coal seams. The result of this study showed that CT could accurately detect the static load stress concentration area, which was mainly located in the zone that was comprehensively influenced by overlying coal pillars, side abutment pressure, and pilot support pressure. The overlying coal pillar was the main influencing factor. In the Xinzhouyao mine, the static load stress concentration area detected by CT and the dynamic load disturbance concentration area detected by the microseismic spatio-temporal law were consistent with the roadway Y. Bao Datong Coal Mine Group Co., Ltd., Datong 037003, Shanxi, China D. Su (&) H. Mu School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China e-mail: [email protected] D. Su H. Mu State Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China
deformation position. According to the comprehensive theoretical model study, the main influencing factors of the local large deformation of the roadway were the static load stress concentration caused by the overlying coal pillar and the dynamic load disturbance caused by the fracture and slippage of the overlying coal pillar and roof under the influence of mining. The superposition of dynamic load disturbance and static load concentrated stress caused large deformation of the roadway, of which the static load stress concentration was the main influencing factor. The conclusions of this study can guide the determination of the risk zone of rock burst under similar conditions. Keywords Multi-coal mining Coal pillar Large deformation of roadway Microseismic monitoring Seismic computed tomography CT
1 Introduction Large deformation of roadways has always been a critical issue affecting the safety production of the coal mine, which it is generally believed that it will only occur in deep soft rock roadways. However, with the development of multi-coal mining, large deformation phenomena were observed in the roadway when the lower coal seam was mined in shallow coal seams (Gao 2018), and rock burst might be triggered in localized areas (Zhao 2018; Sun 2019). The number of
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long-wall mining coal mines in China and around the world is increasing rapidly (Mark 2007; Cartwright 1997; Tu
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