Citation

Zhang Y, Zhang Y, Liu Y, Song Y, Zhao Q. China Saf. Sci. J. 2020; 30(8): 37-43.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.08.006

PMID

unavailable

Abstract

In order to address difficulty in predicting height of overburden failure accurately under threat of multi-layer aquifer in Mengxi deep mining area, failure height of fully mechanized mining face was studied through on-site measurement, numerical simulation and physical simulation method. Firstly, development height of water-conducting fracture zone under condition of full mining of thick coal seam in Nalinhe No.2 mine was measured based on combined observation of well-ground boreholes, water injection and camera technology. Then, numerical and physical similarity models were constructed, and calculation method of overburden failure height in Mengxi mining area was determined according to regression analysis of measured data of mines with similar conditions in China. The results show that ratio of water-conducting fracture zone height to mining height is 17. 1 - 22. 06 from on-sit measurement and 15 - 18. 8 by similar simulation, numerical simulation and theoretical calculation. It is estimated that overburden failure height of fully mechanized mining face can be 18 times of mining height in Mengxi deep mine area. © 2020 China Safety Science Journal

Language: zh