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4. Analysis of the Progressively Enhanced Mine Pressure in the Fully Mechanized Top Coal Caving Work Face of a 20 m Ultra-Thick Coal Seam

Author

Shi Jiulin, Yan Shaohong, Xu Zhuhe, Xue Jisheng, Kaikai Zhao, and Zheng Jianwei

Subjects
Physics, QC1-999
Abstract

Considering the large mined area, wide strata moving range, strong mine pressure occurrence, and difficult roof control for the fully mechanized top coal caving in 20 m ultra-thick coal seams, this study analyzes the strata structure evolution and mine pressure occurrence behavior through field test, numerical simulation, and theoretical analysis. Based on the mine condition of the Tashan Coal Mine in the Datong mining area, mechanical models are established for the compound overlying structures. The following can be demonstrated from this study: (1) The hard strata can form three different compound spatial structures at different positions in the overlying rock strata, including the lower combined cantilever structure I, the middle combined cantilever structure II, and the upper hinged structure. (2) Failure of the higher structure can induce compression on the lower structure, which changed the break span of the lower structure. (3) “Simultaneous and nonsimultaneous structural failures” of the compound spatial structure were caused by the variation of the break span of the multilayered structure. (4) Based on the weighting characteristics, there were three stages during work face weighting, including a gradual pressure increase stage (Stage I), an accelerated pressure increase stage (Stage II), and a fast pressure increase stage (Stage III). (5) The mine pressure occurrence demonstrated a “small to medium and to large” feature. (6) Prefracturing techniques should be additionally incorporated to prevent simultaneous failure of the multilayered structure. Findings of the work can demonstrate the emergence of strong mine pressure in the Datong mining area and have theoretical significance and reference value for maintaining safe mining in similar conditions.

Published
2021
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11. Analysis of the Progressively Enhanced Mine Pressure in the Fully Mechanized Top Coal Caving Work Face of a 20 m Ultra-Thick Coal Seam

Author

Zheng Jianwei, Yan Shaohong, Kaikai Zhao, Xu Zhuhe, Shi Jiulin, and Xue Jisheng

Subjects
Cantilever, Article Subject, Computer simulation, business.industry, Physics, QC1-999, Mechanical Engineering, 0211 other engineering and technologies, Coal mining, 02 engineering and technology, Geotechnical Engineering and Engineering Geology, Condensed Matter Physics, Span (engineering), 020401 chemical engineering, Mining engineering, Mechanics of Materials, Coal, Stage (hydrology), Compression (geology), 0204 chemical engineering, business, Roof, Geology, 021101 geological & geomatics engineering, Civil and Structural Engineering
Abstract

Considering the large mined area, wide strata moving range, strong mine pressure occurrence, and difficult roof control for the fully mechanized top coal caving in 20 m ultra-thick coal seams, this study analyzes the strata structure evolution and mine pressure occurrence behavior through field test, numerical simulation, and theoretical analysis. Based on the mine condition of the Tashan Coal Mine in the Datong mining area, mechanical models are established for the compound overlying structures. The following can be demonstrated from this study: (1) The hard strata can form three different compound spatial structures at different positions in the overlying rock strata, including the lower combined cantilever structure I, the middle combined cantilever structure II, and the upper hinged structure. (2) Failure of the higher structure can induce compression on the lower structure, which changed the break span of the lower structure. (3) “Simultaneous and nonsimultaneous structural failures” of the compound spatial structure were caused by the variation of the break span of the multilayered structure. (4) Based on the weighting characteristics, there were three stages during work face weighting, including a gradual pressure increase stage (Stage I), an accelerated pressure increase stage (Stage II), and a fast pressure increase stage (Stage III). (5) The mine pressure occurrence demonstrated a “small to medium and to large” feature. (6) Prefracturing techniques should be additionally incorporated to prevent simultaneous failure of the multilayered structure. Findings of the work can demonstrate the emergence of strong mine pressure in the Datong mining area and have theoretical significance and reference value for maintaining safe mining in similar conditions.

Published
2021

15. Micro- and macroscopic study of crack propagation in coal: theoretical and experimental results and engineering practice

Author

Liu Quanming, Yan Shaohong, Yu Lei, and Li Li

Subjects
business.industry, 0211 other engineering and technologies, Geology, Fracture mechanics, 02 engineering and technology, Mechanics, Management, Monitoring, Policy and Law, 010502 geochemistry & geophysics, 01 natural sciences, Industrial and Manufacturing Engineering, Geophysics, Coal, business, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences
Published
2018

17. Immunogenicity and safety of different sequential schedules of Sabin strain-based inactivated poliovirus vaccination: A randomized, controlled, open-label, phase IV clinical trial in China

Author

Yan, Shaohong, primary, Chen, Haiping, additional, Zhang, Zhenguo, additional, Chang, Shaoying, additional, Xiao, Yanhui, additional, Luo, Linyun, additional, Zhang, Zhaoyong, additional, Sun, Li, additional, Chen, Xiao, additional, Yang, Yunkai, additional, Shi, Xuanwen, additional, Guo, Yu, additional, Sun, Yunlong, additional, Li, Hong, additional, Li, Na, additional, Han, Shasha, additional, Ma, Meng, additional, and Yang, Xiaoming, additional

Published
2020
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