THERMAL SCIENCE

International Scientific Journal

Cong LiORCID

,

Xiangang Yin

,

Jing XieORCID

,

Gaoyou Peng

THE CHARACTERISTICS OF MINING INDUCED STRESS FLUCTUATIONS IN BROKEN ROCK MASS OVER ONE KILOMETER DEEP COAL MINE

ABSTRACT
Mine pressure is critical to the safety of working face. Evaluating the working resistance accurately of the stope hydraulic supports is one of the most effective and direct ways to reflect the overall stress characteristics of the roof and the defor¬mation, movement and destruction of overlying strata. Due to the complex breaking form of the roof, the working resistance of the hydraulic supports at different positions of the mining face varies in different ways. One can obtain the pressure of hydraulic support system by pressure monitoring and analyze its fractal characteristics. Through spectrum analysis, a new parameter called accumulation power spectral density is defined which is used to describe the difference of working resistance of stope hydraulic supports. The results show that the fractal dimensions of face-end supports are smaller and face-end supports are unco-ordinated. Through in-situ monitoring, it is found that the mining stress has unstable periodic fluctuation characteristics. The conclusion can provide reference for rational selection and optimization of the similar-mining lay-outs.
KEYWORDS
strata behaviors, working resistance, fractal
PAPER SUBMITTED: 2018-06-21
PAPER REVISED: 2018-07-11
PAPER ACCEPTED: 2018-12-13
PUBLISHED ONLINE: 2019-04-14
DOI REFERENCE: https://doi.org/10.2298/TSCI180621119L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 3, PAGES [843 - 851]
REFERENCES
[1] Wang, Z. T., Qian, M. G., The Calculating Methods of the First Weighting Span of Main Roof, Journal of China University of Mining & Technology, 18 (1989), 2,pp. 9-18 (in Chinese)
[2] Qian, M. G.,et al., Research on the Coupling Mechanism between the Stope Support and Surrounding Rock, Journal of China Coal Society, 21(1996), 1, pp. 40-44 (in Chinese)
[3] Huang, P., et al., Optimization and Practice of Support Working Resistance in Fully-Mechanized Top Coal Caving in Shallow Thick Seam,Energies,10(2017), 9, pp. 1406, 10.3390/en10091406
[4] Singh, G. S. P., Singh, U. K., A Numerical Modeling Approach for Assessment of Progressive Caving of Strata and Performance of Hydraulic Powered Support in Longwall Workings, Computers & Geotechnics, 36(2009), 7, pp. 1142-1156
[5] Singh, G. S. P., Singh, U. K., Prediction of Caving Behavior of Strata and Optimum Rating of Hydraulic Powered Support for Longwall Workings, International Journal of Rock Mechanics & Mining Sciences,47(2010), 1, pp. 1-16, 10.1016/j.ijrmms.2009.09.001
[6] Trueman, R., et al., Assessing Longwall Support-roof Interaction from Shield Leg Pressure Data, Mining Technology,114(2005), 3, pp. 176-184, 10.1179/037178405x53953
[7] Sarkar, S. K., Singh, B., The Investigation into Strata Control Failures at Caved Longwall Faces in India and a New Approach for Support Planning to Avoid such Occurrences, Proceedings, Emerging Trends in Engineering & Technology, International Conference on IEEE, 105(1979), pp.468-473
[8] Zhang Q., et al., Mining Pressure Monitoring and Analysis in Fully Mechanized Backfilling Coal Mining Face-A Case Study in Zhai Zhen Coal Mine, Journal of Central South University,22(2015), 5, 1965-1972, 10.1007/s11771-015-2716-2
[9] Wang Z, et al., Measurement of the Strong Pressure Appearance Laws with Hard Roof and Full Mechanized Mining Extra Thick Coal Seam, Geotechnical & Geological Engineering,(2018), Apr., pp. 1-11, 10.1007/s10706-018-0541-8
[10] Gao, M.Z.,et al., Field Experiments on Fracture Evolution and Correlations between Connectivity and Abutment Pressure under Top Coal Caving Conditions. International Journal of Rock Mechanics and Mining Science, 111(2018), Oct., pp. 84-93., 10.1016/j.ijrmms.2018.01.003
[11] Mandelbrot, B. B., The Fractal Geometry of Nature. W.H. Freeman, 51(1983), pp. 468, 10.2307/2981858
[12] Berry, M. V., Lewis, Z. V., On the Weierstrass-Mandelbrot Fractal Function, Proceedings of the Royal Society of London, 370(1980), 1743, pp. 459-484, 10.1098/rspa.1980.0044
[13] Zhou, H. W., Xie, H., Anisotropic Characterization of Rock Fracture Surfaces Subjected to Profile Analysis, Physics Letters A, 325(2004), 5-6, pp. 355-362, 10.1016/j.physleta.2004.04.006
[14] Sayles, R. S., Thomas, T. R., Surface Topography as a Nonstationary Random Process, Nature, 271(1978), 5644,pp. 431-434, 10.1038/271431a0
[15] Ge, S. R., Zhu, H., Fractal in Tribology, Beijing: China Machine Press, 2005 (in Chinese)
[16] Xie, H. P., Wang, J. A., Xie, W. H., Fractal Effects of Surface Roughness on the Mechanical Behavior of Rock Joints, Chaos Solitons & Fractals, 8(1997), 2, pp. 221-252, 10.1016/s0960-0779(96)00050-1
[17] Feder, J., Fractals, Plenum Press, 1988
[18] Falconer, K. J., Fractal Geometry - Mathematical Foundations and Applications, Biometrics, 46(1990), 3, pp. 499, 10.2307/2532125
[19] Brown, S. R., Scholz, C. H., Broad Bandwidth Study of the Topography of Natural Rock Surfaces, Journal of Geophysical Research Solid Earth, 90(1985), B14, pp. 12575-1258, 10.1029/jb090ib14p12575
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The characteristics of mining induced stress fluctuations in broken rock mass over one kilometer deep coal mine

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