Numerical investigation of the evolution of overlying strata and distribution of static and dynamic loads in a deep island coal panel |
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| Authors: | Guang-an Zhu Lin-ming Dou Chang-bin Wang Jing Li Wu Cai Zi-wei Ding |
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| Institution: | 1.School of Energy Engineering,Xi’an University of Science and Technology,Xi’an,China;2.Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education,Xi’an,China;3.Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines,China University of Mining and Technology,Xuzhou,China |
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| Abstract: | A systematic approach to numerically simulating an island longwall panel operation is proposed: it aims to investigate the evolution of overlying strata, static stress and displacement response and dynamic load arising from roof fracturing and fault slip. The results show that due to a small gob width (70 m) on both sides, the evolution height of overlying strata is limited, i.e. the heights of the cave-in zone and fracture zone are 30.98 and 66.91 m, respectively. The numerical model matches the theoretical analysis and field observations. Dynamic analysis reveals that the envelope of mine tremors confirms the good correlation with the evolution of the fracture zone. As the mining panel is far from the fault, fault slip does not occur; at this time, the dynamic load mainly comes from roof fracturing. When mining activities approach the fault, the calculation of the dynamic response of fault slip is performed over the area where the increase of relative shear displacement during dynamic analysis exceeds 0.05 m and where the shear stress along the fault decreases. It is shown that during the initial stage of the mining process, and in a square mining panel, fault slip is more likely to occur, leading to strong tremors and rock bursts, which become more notable in the later stages of the mining of the island panel. |
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