三维矿岩颗粒破裂宏细观力学行为结构效应研究
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项目结题报告(全文)
1.Reasonable Width of Narrow Coal Pillars along Gob-side Driving Entries in Gas Outburst Coal Seams: Simulation and Experiment
- 关键词：
- Stress concentration;Cost reduction;Coal;Coal deposits;Different coals;Displacement and stress;Narrow coal pillars;On-site measurement;Surrounding rock;Surrounding rock stability;Two-dimensional simulations;Width of the coal pillars
- Hao, L.I.U.;Yu-Jun, Z.U.O.;Wen-Ji-Bin, S.U.N.;Zhong-Hu, W.U.;Lu-Jing, Zheng
- 《China Rock 2020 Conference》
- 2020年
- October 23, 2020 - October 26, 2020
- Beijing, China
- 会议
In gob-side entry driving, the coal pillar width determines the stability of the surrounding rock and the pillar itself. Thus, to improve the stability of gas outburst coal seams, the reasonably narrow width of the coal pillars of the 40403 working face of the Shengyuan coal mine 4# was theoretically determined. Through two-dimensional simulations, the surrounding rock stability for a roadway with different coal pillar widths was evaluated. The mechanism of the surrounding rock displacement and stress distribution with the increase of the coal pillar width was also defined; for pillar widths of 2-4, 4-6, and 6-10 m, the vertical stress distribution was approximately triangular, trapezoidal, and parabolic, respectively. The coal pillar displacement was significantly greater on the goaf side than on to the roadway side. As the width of the coal pillar was incremented, its displacement on the goaf side increased, while that on the roadway side remained relatively small. The combination of the simulation results with on-site measurements finally revealed that 5 m is a reasonably narrow coal pillar width. Then, the findings were successfully applied to the 40403 working face of the Shengyuan coal mine 4#, achieving good outburst prevention and cost reduction.
...
© Published under licence by IOP Publishing Ltd.2.Reasonable Width of Narrow Coal Pillars along Gob-side Driving Entries in Gas Outburst Coal Seams: Simulation and Experiment
- 关键词：
- Stress concentration;Cost reduction;Coal;Coal deposits;Different coals;Displacement and stress;Narrow coal pillars;On-site measurement;Surrounding rock;Surrounding rock stability;Two-dimensional simulations;Width of the coal pillars
- Hao, L.I.U.;Yu-Jun, Z.U.O.;Wen-Ji-Bin, S.U.N.;Zhong-Hu, W.U.;Lu-Jing, Zheng
- 《China Rock 2020 Conference》
- 2020年
- October 23, 2020 - October 26, 2020
- Beijing, China
- 会议
In gob-side entry driving, the coal pillar width determines the stability of the surrounding rock and the pillar itself. Thus, to improve the stability of gas outburst coal seams, the reasonably narrow width of the coal pillars of the 40403 working face of the Shengyuan coal mine 4# was theoretically determined. Through two-dimensional simulations, the surrounding rock stability for a roadway with different coal pillar widths was evaluated. The mechanism of the surrounding rock displacement and stress distribution with the increase of the coal pillar width was also defined; for pillar widths of 2-4, 4-6, and 6-10 m, the vertical stress distribution was approximately triangular, trapezoidal, and parabolic, respectively. The coal pillar displacement was significantly greater on the goaf side than on to the roadway side. As the width of the coal pillar was incremented, its displacement on the goaf side increased, while that on the roadway side remained relatively small. The combination of the simulation results with on-site measurements finally revealed that 5 m is a reasonably narrow coal pillar width. Then, the findings were successfully applied to the 40403 working face of the Shengyuan coal mine 4#, achieving good outburst prevention and cost reduction.
...
© Published under licence by IOP Publishing Ltd.