Influence of impact load induced by large-scale roof caving on the failure characteristics of mining floor

被引：0
|
作者：
Huang Q. [1 ]
Cheng J. [2 ]
Ding H. [1 ]
Feng J. [1 ]
Hu X. [1 ]
机构：
[1] School of Architectural Engineering, Anhui University of Technology, Maanshan, 243032, Anhui
[2] State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology(Beijing), Beijing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 06期
关键词：
Dynamic stress concentration; Floor failure; Impact load; Large-scale roof caving;
D O I：
10.13545/j.cnki.jmse.2019.06.020
中图分类号：
学科分类号：
摘要：
In order to research the failure regularity of mining floor and the influence on floor water inrush under impact load caused by large-scale roof caving, the mining floor is simplified as semi-infinite half space, the theoretical calculation model for the impact load has been established based on the dynamic theory of elastic half-space foundation, and calculation formulas for the maximum impact load stress has been deduced in this paper. The propagation rules of stress wave in the rock stratum and the mechanical response of floor strata under the action of dynamic disturbance have been simulated and analyzed with the FLAC3D software. The results have shown that the impact load caused by roof rock mass caving is often much greater than the weight of the collapsed rock mass. The impact dynamic load propagates in the coal floor superposed by mining-induced stress causes dynamical stress concentration. Consequently, the impact load gives rise to secondary damage of the floor rock masses, which leads to the increase of the maximum failure depth of mining floor. So, the risk of floor water inrush is greatly increased due to the decreasing of effective thickness of water-resisting layer. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：1228 / 1233and1239
相关论文
共 14 条
  • [1] Wang L., Han M., Wang Z., Et al., Stress distribution and damage law of mining floor, Journal of Mining & Safety Engineering, 30, 3, pp. 317-322, (2013)
  • [2] Zhang H., Wang L., Computation of mining induced floor additional stress and its application, Journal of Mining & Safety Engineering, 28, 2, (2011)
  • [3] Meng X., Xu C., Gao Z., Et al., Stress distribution and damage mechanism of mining floor, Journal of China Coal Society, 35, 11, pp. 1832-1836, (2010)
  • [4] Li L., Lu W., Li S., Et al., Research status and developing trend analysis of the water inrush mechanism for underground engineering construction, Journal of Shandong University (Engineering Science), 40, 3, (2010)
  • [5] Wu Q., Cui F., Zhao S., Et al., Type classification and main characteristics of mine water disasters, Journal of China Coal Society, 38, 4, pp. 561-565, (2013)
  • [6] Li J., Xu Y., Xie X., Et al., Influence of mining height on coal seam floor failure depth, Journal of China Coal Society, 40, pp. 303-310, (2015)
  • [7] Xiong R., Investigation of mechanism of roof failure due to weighting over great extent, Journal of China Coal Society, 20, pp. 38-41, (1995)
  • [8] Li H., Bai H., Ma D., Et al., Experiment study on mining-induced failure depth lagging coal wall secondary deepening rule, Journal of Mining & Safety Engineering, 33, 2, pp. 318-323, (2016)
  • [9] Li H., Bai H., Ma D., Et al., Physical simulation testing research on mining dynamic loading effect and induced coal seam floor failure, Journal of Mining & Safety Engineering, 35, 2, pp. 366-372, (2018)
  • [10] Ju Y., Xia C., Xie H., Et al., Numerical analysis on rupture of subfloor of coal mine tunnel subjected to blasting loads, Chinese Journal of Rock Mechanics and Engineering, 23, 21, pp. 3664-3668, (2004)
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