Effect of Principal Stress Field on the Development of Plastic Zone ahead of the Gateroad

Hongtao Liu, Linfeng Guo, Xidong Zhao and Pengfei Wang
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Hongtao Liu: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Linfeng Guo: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Xidong Zhao: School of Safety Engineering, North China Institute of Science & Technology, Beijing 101601, China
Pengfei Wang: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Energies, 2020, vol. 13, issue 17, 1-16

Abstract: The distribution of a plastic zone ahead of a gateroad plays a significant role in maintaining the long-term stability of mining spaces. For a long time, the principal stress field such as the values, the direction, etc. have been observed to have impacts on plastic zone development, but has not been looked into deeply and systematically. To this end, the influence of principal stress field including the maximum principal stress ( P 1 ), the angle between the P 1 direction and the Z -axis (α), the minimum principal stress ( P 3 ), and the ratio of maximum principal stress to minimum principal stress ( P 1 / P 3 ) on the expansion of the plastic zone ahead of the gateroad is investigated by the (Fast Lagrangian Analysis of Continua) FLAC 3D models. The results show that: (1) The plastic zone volume increases first and then decreases with the increase of α , and the direction of butterfly-shaped plastic zone ahead of gateroad is rotating with the evolution of α . (2) The plastic zone volume ahead of excavation face increases gradually with the increase of P 1 / P 3 . Mutagenicity of butterfly-shaped plastic zone occurs ahead of the gateroad under a certain value of P 1 / P 3 . (3) With the increase of P 1 and decrease of P 3 , the plastic zone volume is of exponential growth. The plastic zone volume approaches infinity when the critical value of maximum principal stress ([ P 1 ]) and the minimum principal stress ([ P 1 ]) is obtained. (4) The study of the effect of principal stress field on the expansion of plastic zone ahead of the gateroad is helpful for revealing the mechanisms of coal and gas outbursts. The critical stress state of butterfly-shaped plastic zone mutagenicity ahead of the gateroad can be used as an important indicator for assessing the risk of coal and gas outburst. The research can also guide the prevention of coal and gas outburst ahead of the gateroad.

Keywords: principal stress field; plastic zone; upward mining; expansion; coal and gas outbursts (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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