预测孟加拉国巴拉普库利亚长壁煤矿开采引起的沉降。

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

机构信息

Department of Petroleum and Mining Engineering, Faculty of Civil Engineering, MIST, 1st Floor, General Mustafiz Tower, Mirpur Cantonment, Dhaka, 1216, Bangladesh.

Faculty of Engineering, Hokkaido University, Sapporo, 060-8628, Japan.

出版信息

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

DOI:10.1038/s41598-022-19160-1

PMID:36042276

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9427737/

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.

摘要

为了实现可持续的矿山管理，预测采矿引起的沉降至关重要。在巴拉普库利亚长壁煤矿，由于开采了 10 米厚的煤层，北部上盘（NUP）和南部下盘（SLP）的最大观测沉降量分别为 5.8 米和 4.2 米，具有明显的面积范围。采用位移不连续法模拟了采矿引起的沉降。数值模型考虑了地面、采矿盘区、断层和堤坝的影响。通过改变杨氏模量比较了 NUP 和 SLP 开采引起的预测和观测沉降，发现 0.10 GPa 的杨氏模量在地质环境条件下是最佳匹配。计算中断层和堤坝的影响可以忽略不计。通过考虑开采 30 米厚煤层，预测未来沉降在 NUP 为 15.7-17.5 米，SLP 为 8.7-10.5 米。考虑倾斜角度和拉伸应变的易损区域可能会延伸到煤矿办公区和一些村庄。