Surrounding Rock Failure Mechanism and Control Technology of Gob-Side Entry with Triangle Coal Pillar at Island Longwall Panel in 15 m Extra-Thick Coal Seams
Taking the return air roadway of Tashan 8204 isolated island working face as the background, the evolution law of the stress field in the surrounding rock of the widened coal pillar area roadway during the mining period of the isolated island working face is obtained through numerical simulation. The hazardous area of strong mine pressure under different coal pillar widths is determined. Through simulation, it is known that when the width of the coal pillar is less than 20 m, there is large bearing capacity on the coal side of the roadway entity. The force on the side of the coal pillar is relatively small. When the width of the coal pillar ranges from 25 m to 45 m, the vertical stress on the roadway and surrounding areas is relatively high. Pressure relief measures need to be taken during mining to reduce surrounding rock stress. When the width of the coal pillar is greater than 45 m, the peak stress of the coal pillar is located in the deep part of the surrounding rock, but it still has a certain impact on the roadway. It is necessary to take pressure relief measures to transfer the stress to a deeper depth to ensure the stability of the triangular coal pillar during the safe mining period of the working face. This provides guidance for ensuring the stability of the triangular coal pillar during the safe mining period of the working face.
References
[1]
Zhang, J.C., Li, X.L., Qin, Q.Z., Wang, Y.B. and Gao, X. (2023) Study on Overlying Strata Movement Patterns and Mechanisms in Super-Large Mining Height Stopes. Bulletin of Engineering Geology and the Environment, 82, Article No. 142. https://doi.org/10.1007/s10064-023-03185-5
[2]
Wang, S.R., Wu, X.G., Zhao, Y.H. and Hagan, P. (2018) Mechanical Performances of Pressure Arch in Thick Bedrock during Shallow Coal Mining. Geofluids, 2018, Article ID: 2419659. https://doi.org/10.1155/2018/2419659
[3]
Zhu, S.T., Feng, Y. and Jiang, F.X. (2016) Determination of Abutment Pressure in Coal Mines with Extremely Thick Alluvium Stratum: A Typical Kind of Rockburst Mines in China. Rock Mechanics and Rock Engineering, 49, 1943-1952. https://doi.org/10.1007/s00603-015-0868-x
[4]
Xie, J., Gao, M.Z., Zhang, R., Li, S.W., Tan, Q. and Qiu, Z.Q. (2016) Lessons Learnt from Measurements of Vertical Pressure at a Top Coal Mining Face at Datong Tashan Mines, China. Rock Mechanics and Rock Engineering, 49, 2977-2983. https://doi.org/10.1007/s00603-015-0856-1
[5]
Zhou, P., Wang, Y.J., Zhu, G.L. and Gao, Y.B. (2019) Comparative Analysis of the Mine Pressure at Non-Pillar Longwall Mining by Roof Cutting and Traditional Longwall Mining. Journal of Geophysics and Engineering, 16, 423-438. https://doi.org/10.1093/jge/gxz026
[6]
Wang, S.R., Wu, X.G., Zhao, Y.H., Hagan, P. and Cao, C. (2019) Evolution Characteristics of Composite Pressure-Arch in Thin Bedrock of Overlying Strata During Shallow Coal Mining. International Journal of Applied Mechanics, 11, 1950030. https://doi.org/10.1142/S1758825119500303
[7]
Miao, K.J., Wang, D.P., Tu, S.H., et al. (2022) The Principle and Practice of Strong Mine Pressure Control in the Initial Mining and Caving Stages under Multiple Key Strata. Sustainability, 14, Article 5772. https://doi.org/10.3390/su14105772
[8]
Zhang, Q., Zhang, J.X., Chen, Y., Ntigurirwa, J.D. and Xia, K.Q. (2020) Moving Set-up Room Theory of Weakening the Mining Pressure Caused by the Backfilling Body in Solid Backfilling Mining. Energy Science & Engineering, 8, 898-909. https://doi.org/10.1002/ese3.559
[9]
Gong, T., Xia, B.W., Lu, Y.Y., Luo, Y.F. and Hu, H.R. (2020) Study on the Maximum Pressure-Causing Stratum in Longwall Mining Stope and Its Mechanics Analysis. Arabian Journal of Geosciences, 13, Article No. 566. https://doi.org/10.1007/s12517-020-05625-y
[10]
Shi, J.L., Yan, S.H., Xu, Z.H., Xue, J.S., Zhao, K.K. and Zheng, J.W. (2021) Analysis of the Progressively Enhanced Mine Pressure in the Fully Mechanized Top Coal Caving Work Face of a 20 m Ultra-Thick Coal Seam. Shock and Vibration, 2021, Article ID: 6678207.
[11]
Feng, J.W., Wang, W.M., Wang, Z., et al. (2023) Study on the Mechanism and Control of Strong Rock Pressure in Thick Coal Seam Mining under the Goaf of Very Close Multiple Coal Seams. Processes, 11, Article 1320. https://doi.org/10.3390/pr11051320
[12]
Zhao, Y.H., Wang, S.R., Hagan, P. and Guo, W.B. (2018) Evolution Characteristics of Pressure-Arch and Elastic Energy during Shallow Horizontal Coal Mining. Tehnički Vjesnik, 25, 867-875. https://doi.org/10.17559/TV-20180305084447
[13]
Zhou, H.F., Huang, Q.X., Liu, Y.J. and He, Y.P. (2021) Study on the Mine Pressure Law and the Pressure Frame Mechanism of an Overlying Goaf in a Shallow Coal Seam. Shock and Vibration, 2021, Article ID: 9675137. https://doi.org/10.1155/2021/9675137
[14]
Zhang, Q., Zhang, J.X., Kang, T., Sun, Q. and Li, W.K. (2015) Mining Pressure Monitoring and Analysis in Fully Mechanized Backfilling Coal Mining Face—A Case Study in Zhai Zhen Coal Mine. Journal of Central South University, 22, 1965-1972. https://doi.org/10.1007/s11771-015-2716-2
[15]
Zhu, Z.J., Wu, Y.L. and Liang, Z. (2022) Mining-Induced Stress and Ground Pressure Behavior Characteristics in Mining a Thick Coal Seam with Hard Roofs. Frontiers in Earth Science, 10. https://doi.org/10.3389/feart.2022.843191
[16]
Guo, P., Zhao, Y., Yuan, Y., et al. (2021) Gob-Side Entry Stability Analysis by Global-Finite and Local-Discrete Modeling Approach. Geomechanics and Engineering, 27, 391-404.
[17]
Li, J.Z., Zhang, M., Li, Y. and Hu, H. (2018) Surrounding Rock Control Mechanism in the Gob-Side Retaining Entry in Thin Coal Seams, and Its Application. Journal ofthe South African Institute of Mining & Metallurgy, 118, 471-480.
[18]
Han, Cl., Zhang, N., Li, By., et al. (2015) Pressure Relief and Structure Stability Mechanism of Hard Roof for Gob-Side Entry Retaining. Journal of Central South University, 22, 4445-4455. https://doi.org/10.1007/s11771-015-2992-x
