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. 2022 Aug 30;12(1):14800.
doi: 10.1038/s41598-022-19160-1.

Prediction of mining-induced subsidence at Barapukuria longwall coal mine, Bangladesh

A K M Badrul Alam  1 , Yoshiaki Fujii  2 , Shaolin Jahan Eidee  3 , Sophea Boeut  4 , Afikah Binti Rahim  5
Affiliations

Prediction of mining-induced subsidence at Barapukuria longwall coal mine, Bangladesh

A K M Badrul Alam et al. Sci Rep. .

Abstract

It is essential to predict the mining-induced subsidence for sustainable mine management. The maximum observed subsidence having a noticeable areal extent due to Northern Upper Panels (NUP) and Southern Lower Panels (SLP) at the Barapukuria longwall coal mine is 5.8 m and 4.2 m, respectively, after the extraction of a 10 m thick coal seam. The mining-induced subsidence was simulated by the Displacement Discontinuity Method. The numerical model considered the effects of the ground surface, mining panels, faults, and the dyke. The predicted and the observed subsidence due to the mining of NUP and SLP were compared by varying Young's modulus, and the 0.10 GPa Young's modulus was found to be the best match in the geo-environmental condition. The effects of the faults and the dyke in the calculation were negligible. Future subsidence was predicted by considering 30 m extraction of the thick coal seam as 15.7-17.5 m in NUP and 8.7-10.5 m in SLP. The vulnerable areas demarcated considering the tilt angle and extensile strain might extend up to the coal mine office area and some villages.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Predicted and measured subsidence profiles by empirical methods. GR_Graphical Method; PFM_Profile Function Method; IFM_Influence Function Method. (Modified after Ahmed).
Figure 2
Figure 2
Structural framework and the coal basins of Bangladesh. (Modified after Imam). (Abobe Illustrator 10, https://www.adobe.com/products/illustrator.html).
Figure 3
Figure 3
(a) Barapukuria coal basin and the areal extent of mining and (b) the associated rock layers with the thickest coal seam. (Modified after Armstrong). (Rockworks20, https://www.rockware.com/product/rockworks/#; Abobe Illustrator 10, https://www.adobe.com/products/illustrator.html).
Figure 4
Figure 4
The faults (red) and a dyke (cyan) of the Barapukuria coal basin and the mining panels (BCMCL).
Figure 5
Figure 5
(a) Uniaxial compressive strength and (b) bulk density of the coal bearing formation.
Figure 6
Figure 6
The subsidence in the Barapukuria coal mine area. (a) Subsidence epicenters (Google image) (b) Subsidence (mm) contour (BCMCL). (Abobe Illustrator 10, https://www.adobe.com/products/illustrator.html).
Figure 7
Figure 7
The mine model with mine panels and main discontinuities.
Figure 8
Figure 8
Calculated subsidence (m) considering Young’s modulus of (a) 5 GPa (b) 3 GPa (c) 1 GPa with a logarithmic decrement. (ev ver5.01 http://fubuki.g1.xrea.com/rml/fujii/ev/ev.htm).
Figure 9
Figure 9
Young’s modulus effect in the predicted subsidence.
Figure 10
Figure 10
(a) The subsidence (m) due to panel extraction with faults and the dyke effect and (b) faults and the dyke affect. (ev ver5.01 http://fubuki.g1.xrea.com/rml/fujii/ev/ev.htm).
Figure 11
Figure 11
Future subsidence (m) due to total extraction of 30 m coal seam. (ev ver5.01. http://fubuki.g1.xrea.com/rml/fujii/ev/ev.htm).
Figure 12
Figure 12
Future subsidence and vulnerable area considering tilt angle and extensile strain due to total extraction of 30 m coal seam. (ev ver5.01. http://fubuki.g1.xrea.com/rml/fujii/ev/ev.htm).
Figure 13
Figure 13
Future subsidence scenario of the mine area due to extraction of 30 m coal seam. (a) Subsided area (2 m boundary line) and (b) vulnerable areas considering tilt angle (.3%, yellow color) and extensile strain (.2%, magenta color). (Google image, Abobe Illustrator 10, https://www.adobe.com/products/illustrator.html).
See this image and copyright information in PMC

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