Theoretical analysis of support stability in large dip angle coal seam mined with fully-mechanized top coal caving
Abstract
Support stability is all along one of the problems in mining at large dip angle coal seam with fully-mechanized top coal caving. Support stability such as anti-dumping, anti-slip, and anti-rotation at support tail assembly were analyzed on the basic of the mechanic model of large dip angle coal seam along face dip and strike. The relations between each factor and stability were researched, which shows, firstly, the support stability was negatively correlation with dip angle along the face dip, secondly, higher top caving means lower anti-rotation at support tail assembly, thirdly, with initial support force and working resistance of support enhanced, the support anti-slip, and anti-rotation at tail assembly can be risen significantly. Along the strike, support strike critical tilting angle is proportional to dip angle, mining height, support weight, support width and support force. Similarly, support strike critical slip angle is positive correlation with support force, friction coefficient of roof and metal support. According to the results of mechanic analysis, support stability in large dip angle can be risen efficiently and support slipping, dumping and rotation can be avoided by selecting proper technology method such as enhancing initial support force appropriately and choosing fit-designed support.
References
Buzilo V., Serdyuk, V. and Yavorsky. (2010). A Research of influence of support resistance of the stope in the immediate roof condition In: New Techniques and Technologies in Mining - Proceedings of the School of Underground Mining. pp. 127-130
Huang, Z.Z., Ren, Y.F. and Zhang H.J. (2010), Study on key technology of fully mechanized top coal caving in extra-thick soft coal seam with great dip angle. Journal of China Coal Society, Volume 35 No. 11, pp. 1878-1882.
Liu, C.Q. (2014), The Movement Law of the Roof Rock and the Stability of the Support in the Big Dip Thick Coal Seam Large Mining Height Working Face in Quandian Coal Mine. China University of Mining and Technology, Xuzhou, 67p.
LIU, C.Y., YANG, J.X., Yu, B., and Yang, P.J. (2014). Destabilization regularity of hard thick roof group under the multi-gob . Journal of China Coal Society, Volume. 39, No, 3, pp. 395-403.
Liu, Z.M., Chen, Z.H., Xie J.W. et al. (2004) Stability analysis and control measures of powered supports in greater inclined full-mechanized coal seam. Journal of China Coal Society, Volume 29, No. 3, pp. 264-268．
Wu, F.F., Liu, C.Y., Li, J.W.(2014) Combination hydraulic support stability of working face in large inclined and “three-soft” thick seam. Journal of Mining & Safety Engineering, Volume 31, No.5 pp. 721-725, 732.
Xie, P.S., Wu, Y.P., Wang, H.W., Gao, X.C., Ren, S.G., and Zeng, Y.F. (2012). Stability analysis of incline masonry structure and support around longwall mining face area insteeply dipping seam．Journal of China Coal Society, Volume 37, No. 8, pp. 1275-1280.
Yuan, Y., Tu, S.H., Dou, F.J., et al. (2008). Support instability mechanism of fully mechanized top coal caving face with steep coal seams and its control. Journal of Mining & Safety Engineering, Volume 25, No. 4, pp.430-434.
Zhang, D.S., Wu, X., Zhang, W. and Fan, G.W. (2013). Stability analysis on support in large inclined coalface during special mining period. Journal of Mining & Safety Engineering. Volume 30, No. 3, pp. 331-336.
Zhang, Z.Y. (2011). Dynamic analysis on stability of hydraulic powered support in deep inclined fully mechanized wall and prevention slips measures. Journal of China Coal Society, Volume 30, No.7, pp. 705-709.
