Analysis of factors and countermeasures of mining subsidence in Kaiyang Phosphorus Mine

Abstract

Ground crack and subsidence were investigated in Kaiyang Phosphorus Mine as an example. Contribution factors to cause ground crack and mining subsidence were studied, including mining method, mining depth and ore thickness and stope size, dip angle of orebody, geological structure, nature of overburden and water contents, and roof supports, etc. Countermeasures against cracks and subsidence were put forward. The uniaxial compressive strength of compounded phosphorus gypsum after 28 d of curing period was tested to be more than 1 MPa. Phosphorus gypsum can be used as materials for the backfill of stope. By comparison and numerical simulation, cut and fill mining method with middle-deep drilling holes and ore transportation by blasting force was selected as the optimum mining method in Kaiyang Phosphorus Mine.

Keywords

mining subsidence / ground crack / cut and fill mining method / Kaiyang Phosphorus Mine

References

[1] Editing Committee of Mining Handbook.Mining handbook[M], 1999, Beijing, Metallurgy Industry Press

[2] KratzschH.Mining subsidence engineering[M], 1983, Berlin, Springer-Verlag

[3] QianM.-g., MiaoX.-xing.. Mining strata mechanics-a new branch of applied mechanics[J]. Jiangsu Mechanics, 1997, 13(1): 7-10

[4] XuS.-t., RaoY.-z., PanJ.-ping.. Mechanism of ground surface displacement & uneven subsidence caused by underground mining[J]. Mining Engineering, 2004, 2(1): 31-33

[5] AmbrozicT., TurkG.. Prediction of subsidence due to underground mining by artificial neural networks[J]. Computers & Geosciences, 2003, 29(5): 627-637

[6] FangJ.-q., PengZ.-b., YanR.-gui.. The law of tectonic stress mining ground surface subsidence and its engineering treatment method[J]. Journal of Central South University: Science and Technology, 2004, 35(3): 506-510

[7] LiuB.-chen.. Ground surface movement due to underground excavation in P. R. China[C]. Hudson J A. Comprehensive Rock Engineering, 1993, London, Pergamon Press: 781-817

[8] SongY.-hong.Finite element analysis of mining method under highway in Kaiyang phosphorus mine[D], 2005, Changsha, School of Resources and Safety Engineering, Central South University

[9] ZhangH.-s., ZhaoQ.-z., WangZ.. Mining affects on eco-environment of coal mining areas[J]. Journal of Taiyuan University of Technology, 2000, 31(1): 97-100

[10] China Environmental Protection Bureau.Investigation report on damage and rebuild of ecology & environment in mine development[R], 2004, Beijing, China Environmental Protection Bureau

[11] Central South University, Kaiyang Phosphorus Mine.Report on general mining techniques under highway in Kaiyang Phosphorus Mine[R], 2004, Changsha, Central South University

[12] Central South University, Kaiyang Phosphorus Mine.Report on mining method under highway in Yongshaba Phosphorus Mine[R], 2004, Changsha, Central South University

[13] WangY.-h., DengK.-z., ZhangD.-zhi.. The study on the character of strata subsidence during repeat mining[J]. Journal of China Coal Society, 1998, 23(5): 470-475

[14] LiuS.-z., HuX.-run.. The analysis of fuzzy classification on the coefficient of subsidence[J]. Journal of Nanjing Architectural and Civil Engineering Institute, 2001, 18(2): 27-31

[15] HeH., ZhaoM., LinK.-sheng.. Subsidence coefficient calculation based on ANN[J]. Nonferrous Metals, 2004, 56(3): 90-93