Control Method of Roadway Surrounding Rock Under the Influence of Residual Coal Pillars in Goaf

Dongshan Huang

doi:10.62051/ijnres.v3n1.10

Authors

Dongshan Huang

DOI:

https://doi.org/10.62051/ijnres.v3n1.10

Keywords:

Legacy coal pillars, stress environment, Failure patterns of surrounding rocks, Principal stress difference.

Abstract

In the process of close coal seam mining, the lower coal seam is affected by the concentrated stress of the remaining coal pillars in the goaf area of the upper coal seam, and the surrounding rock of the roadway may appear in the surrounding rock of the roadway, such as large deformation, strong sheet gang, and roofing, and the targeted surrounding rock control countermeasures are the key to ensure the stability of the surrounding rock. In order to solve the above problems, taking the thick-topped coal mining roadway of the B1 coal seam of Kuangou mine as the engineering background, the comprehensive research methods such as numerical simulation, theoretical analysis and field test were used to analyze the environmental characteristics of high deviator stress, such as the maximum principal stress and the difference of principal stress at different roadway locations of the B1 coal seam under the influence of the legacy coal pillars, and the plastic failure law of the surrounding rock under the action. The results show that under the condition of the remaining coal pillars in the 15m goaf, the maximum principal stress concentration area is located in the range of 10.0m~15.0m, and the peak value is about 0.95 times of the original rock stress.

References

F. Liu, W.J. Cao, J.M. Zhang, et al. Current technological innovation and development direction of the 14th Five-Year Plan period in China coal industry,Joural Of China Coal Society,Vol.46(2021), No. 01, p: 1-15.

P.F. Jiang, H.P. Kang, J. Zhang, et al. Mechanism of Load-Transfer Between Coal Pillars with Different Widths in Mining the Short-Range Seams, Journal of Mining & Safety Engineering,Vol.28(2011), No. 03, p: 345-349.

G.C. Yan, Y.Q. Hu, X.M. Song, et al. Theory And Physical Simulation Of Conventional Staggered Distance During Combined Mining Of Ultra-close Thin Coal Seam Group, Chinese Journal of Rock Mechanics and Engineering, Vol.28(2009), No. 03, p: 591-597.

D.Y. Hao, Y.Z. Wu, H.J. Chen, et al. Instability mechanism and prevention technology of roadway in close distance and extra thick coal seam under goaf, Journal of China Coal Society, Vol.44(2019), No. 09, p: 2682-2690.

W.L. Li, S.H. Tu, H.S. Tu, et al. Failure characteristics and control techniques for mining roadway affected by stress accumulation of residual pillars in contiguous coal seams, Engineering Failure Analysis, Vol. 141(2022).

Q. Li, G.Y. Wu, D.Z. Kong, et al. Study on Stability of Stope Surrounding Rock under Repeated Mining in Close-Distance Coal Seams, Geofluids, 2022.

G.S. Yang, J.S. Wang. Overburden structure evolution and pressure law of second mining in close-range coal seam group, Journal of China Coal Society, Vol.43(2018), No. S2, p:353-358.

F.L. He, Y. Yang, L. Li, et al. Determining reasonable position of roadway for close coal seam, Journal of Mining Science and Technology, Vol.7(2022), No. 04, p:505-512.

K. Lv, F.L. He, X.H. Xu, et al. Layout of roadway under goaf based on scale effect of mining cross upper coal pillar, Coal Science and Technology, Vol.51(2023), No. 03, p:52-60.

F.L. He, L. Li, K. Lv, et al. Study on Evolution of Front Abutment Pressure at Working Face in Repeated Mining of Close-Distance Coal Seams, Sustainability, Vol.14(2022), No. 19.

N.J. Ma, J. Li, Z.Q. Zhao. Distribution of the deviatoric stress field and plastic zone in circular roadway surrounding rock, Journal of China University of Mining & Technology, Vol.44(2015), No. 02, p: 206-213.

H.S. Jia, K. Pan, D.F. Li, et al. Roof fall mechanism and control method of roof with weak interlayer in mining roadway, Journal of China University of Mining & Technology, Vol.51(2022), No. 01, p: 67-76+89.

H.S. Jia, N.J. Ma, Q.K. Qian. Mechanism and control method of roof fall resulted from butterfly plastic zone penetration, Journal of China Coal Society, Vol.41(2016), No. 06, p: 1384-1392.

HUANG Cong, WANG Weijun, YUAN Chao, et al. Study on the Influence of the Change of Principal Stress Direction on the Morphological Characteristics of Plastic Zone in Surrounding Rock of Roadway[J]. Mineral Engineering Research, 2020, 35(01): 7-11.