Through
the theoretical analysis of overburden destabilization mechanism, FLAC 3D
simplified plane numerical simulation method and field measurement method, we
compared the relationship of overburden support pressure at 35m of
workface recovery, and the peak overburden support pressure decreased from 13.85Mpa to
11.97Mpa
from 1:1 to 1:3. With the increase of mining ratio, the peak over-supporting
pressure decreases: with the increase of top coal recovery thickness, the peak
over-supporting pressure and the influence range will be further expanded, and
the distance between the peak over-supporting pressure and the coal wall of the
working face will be further increased and the high stress zone of the peak
area will be expanded simultaneously.
References
[1]
Xie, F.X. (2017) Research on the Location of Fracture and Structural Stability of Overlying Rock Seam along the Heaving Coal Tunnel. China University of Mining and Technology (Beijing), Beijing.
[2]
Lutz, L. and Gergeley, P. (1967) Mechanics of Band and Slip of Deformed Bars in Concrete. Journal of American Concrete Institute, 64, 711-721.
https://doi.org/10.14359/7600
[3]
Hansor, N.W. (1969) Influence of Surface Roughness of Prestressing Strand on Band Performance. Journal of Prestressed Concrete Institute, 14, 32-45.
https://doi.org/10.15554/pcij.02011969.32.45
[4]
Henson Jr., H. and Sexton, J.L. (1991) Preliminary Study of Shallow Coal Seams Using High-Resolution Seismic Reflection Methods. Geophysics, 56, 1494-1503.
https://doi.org/10.1190/1.1443171
[5]
(2022) Numerical Simulation on Instability Mechanism of Section Coal Pillar in Shallow Buried Coal Seams. Tehnicki Vjesnik, 29, 108-113.
[6]
Sun, Y., Zuo, J., Karakus, M., et al. (2019) Investigation of Movement and Damage of Integral Overburden during Shallow Coal Seam Mining. International Journal of Rock Mechanics and Mining Sciences, 117, 63-75.
https://doi.org/10.1016/j.ijrmms.2019.03.019
[7]
Huang, Q., He, Y. and Cao, J. (2019) Experimental Investigation on Crack Development Characteristics in Shallow Coal Seam Mining in China. Energies, 12, 1302.
https://doi.org/10.3390/en12071302
[8]
Singh, R., Singh, T.N. and Dhar, B.B. (1996) Coal Pillar Loading in Shallow Mining Conditions. International Journal of Rock Mechanics and Mining Sciences, 33, 757- 768. https://doi.org/10.1016/S0148-9062(96)00036-8
[9]
Wang, C., Zhang, C., Zhao, X., et al. (2018) Dynamic Structural Evolution of Overlying Strata during Shallow Coal Seam Longwall Mining. International Journal of Rock Mechanics and Mining Sciences, 103, 20-32.
https://doi.org/10.1016/j.ijrmms.2018.01.014
[10]
Cao, J., Huang, Q. and Guo, L. (2021) Subsidence Prediction of Overburden Strata and Ground Surface in Shallow Coal Seam Mining. Scientific Reports, 11, Article No. 18972. https://doi.org/10.1038/s41598-021-98520-9
[11]
Cao, J. and Huang, Q. (2021) Roof Structure of Shallow Coal Seam Group Mining in Western China. PLOS ONE, 16, e0255047.
https://doi.org/10.1371/journal.pone.0255047
[12]
Chernyak, I.L. and Chekhmestrenko, N.V. (1993) Ways of Roof Rock Stability Control in Breakage Faces. Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, 6, 47-50.%
