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Geomechanics and Engineering Volume 14, Number 5, April10 2018 , pages 421-428 DOI: https://doi.org/10.12989/gae.2018.14.5.421 |
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Investigation lateral deformation and failure characteristics of strip coal pillar in deep mining |
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Shaojie Chen, Xiao Qu, Dawei Yin, Xingquan Liu, Hongfa Ma and Huaiyuan Wang
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| Abstract | ||
| In deep mining, the lateral deformation of strip coal pillar appears to be a new characteristic. In order to study the lateral deformation of coal-mass, a monitoring method and monitoring instrument were designed to investigate the lateral deformation of strip coal pillar in Tangkou Coalmine with the mining depth of over 1000 m. Because of without influence of repeated mining, the bedding sandstone roof is easy to break and the angle between maximum horizontal stress and the roadway is small, the maximum lateral deformation is only about 287 mm lower than the other pillars in the same coalmine. In deep mining, the energy accumulation and release cause a discontinuous damage in the heterogeneous coal-mass, and the lateral deformation of coal pillar shows discontinuity, step and mutation characters. These coal-masses not only show a higher plasticity but also the high brittleness at the same time, and its burst tendency is more obvious. According to the monitoring results and theoretical calculations, the yield zone of the coal pillar width is determined as 15.6 m. The monitoring results presented through this study are of great significance to the stability analysis and design of coal pillar. | ||
| Key Words | ||
| lateral deformation; strip coal pillar in deep mining; field monitoring; step and mutation deformation; yield zone | ||
| Address | ||
| Shaojie Chen: 1.) State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, 579 Qianwanggang Road, Huangdao District, Qingdao, Shandong Province, 266590, China 2.) Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education, Anhui University of Science and Technology, 168 Taifeng Road, Huainan, Anhui Province, 232001, China Xiao Qu, Dawei Yin, Xingquan Liu, Hongfa Ma and Huaiyuan Wang: State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, 579 Qianwanggang Road, Huangdao District, Qingdao, Shandong Province, 266590, China | ||