Browse > Article
http://dx.doi.org/10.12989/gae.2016.11.5.657

Investigation on energy dissipation and its mechanism of coal under dynamic loads  

Feng, Junjun (Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology)
Wang, Enyuan (Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology)
Shen, Rongxi (Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology)
Chen, Liang (Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology)
Li, Xuelong (Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology)
Xu, Zhaoyong (Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology)
Publication Information
Geomechanics and Engineering / v.11, no.5, 2016 , pp. 657-670 More about this Journal
Abstract
The energy dissipation of coal under dynamic loads is a major issue in geomechanics and arising extensive concerns recently. In this study, dynamic loading tests of coal were conducted using a split Hopkinson pressure bar (SHPB) system, the characteristics of dynamic behavior and energy dissipation of coal were analyzed, and the mechanism of energy dissipation was discussed based on the fracture processes of coal under dynamic loads. Experimental results indicate that the energy dissipation of coal under dynamic loads has a positive linear correlation with both incident energy and dynamic compressive strength, and the correlation coefficients between incident energy, dynamic compressive strength and the energy dissipation rate are 0.74 and 0.98, respectively. Theoretical analysis demonstrates that higher level of stress leads to greater energy released during unstable crack propagation, thus resulting in larger energy dissipation rate of coal under dynamic loads. At last, a semi-empirical energy dissipation model is proposed for describing the positive relationship between dissipated energy and stress.
Keywords
split Hopkinson pressure bar; energy dissipation; incident energy; dynamic compressive strength; fracture processes;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Aydin, A. (2014), "Upgraded ISRM suggested method for determining sound velocity by ultrasonic pulse transmission technique", Rock. Mech. Rock. Eng., 47(1), 255-259.   DOI
2 Bieniawski, Z.T. (1968), "Fracture dynamics of rock", Int. J. Fract., 4(4), 415-430.
3 Bieniawski, Z.T. and Bernede, M.J. (1979), "Suggested methods for determining the uniaxial compressive strength and deformability of rock materials", Int. J. Rock. Mech. Min., 16(4), 137-140.
4 Chen, W.W. and Song, B. (2010), Split Hopkinson (Kolsky) Bar: Design, Testing and Applications, Springer, New York, NY, USA.
5 Davies, E.D.H. and Hunter, S.C. (1963), "The dynamic compression testing of solids by the method of the split hopkinson pressure bar", J. Mech. Phys. Solids, 11(3), 155-179.   DOI
6 Freund, L.B. (1998), Dynamic Fracture Mechanics, Cambridge University Press, Cambridge, UK.
7 Gaziev, E. (2001), "Rupture energy evaluation for brittle materials", Int. J. Solids. Struct., 38(42-43), 7681-7690.   DOI
8 Hong, L., Zhou, Z.L., Yin, T.B., Liao, G.Y. and Ye, Z.Y. (2009), "Energy consumption in rock fragmentation at intermediate strain rate", J. Cent. South Univ. Technol., 16(4), 677-682.   DOI
9 Huang, D. and Li, Y.R. (2014), "Conversion of strain energy in triaxial unloading tests on marble", Int. J. Rock. Mech. Min., 66(2), 160-168.
10 Li, M., Mao, X., Lu, A., Tao, J., Zhang, G., Zhang, L. and Li, C. (2014), "Effect of specimen size on energy dissipation characteristics of red sandstone under high strain rate", Int. J Min. Sci. Technol., 24(2), 151-156.   DOI
11 Liu, J.Z., Xu, J.Y., Lv, X.C., Zhao, D.H. and Leng, B.L. (2012), "Experimental study on dynamic mechanical properties of amphibolites, sericite-quartz schist and sandstone under impact loadings", Int. J. Nonlinear Sci. Numer. Simul., 13(2), 209-217.
12 Song, D., Wang, E., Li, Z., Liu, J. and Xu, W. (2015), "Energy dissipation of coal and rock during damage and failure process based on EMR", Int. J Min. Sci. Technol., 25(5), 787-795.   DOI
13 Lundberg, B. (1976), "A split Hopkinson bar study of energy absorption in dynamic rock fragmentation", Int. J. Rock. Mech. Min., 13(6), 187-197.   DOI
14 Peng, R.D., Ju, Y., Wang, J.G., Xie, H.P., Gao, F. and Mao, L.T. (2015), "Energy dissipation and release during coal failure under conventional triaxial compression", Rock. Mech. Rock. Eng., 48(2), 509-526.   DOI
15 Song, D.Z., Wang, E.Y. and Liu, J. (2012), "Relationship between EMR and dissipated energy of coal rock mass during cyclic loading process", Safety Sci., 50(4), 751-760.   DOI
16 Sufian, A. and Russell, A.R. (2013), "Microstructural pore changes and energy dissipation in Gosford sandstone during pre-failure loading using X-ray CT", Int. J. Rock. Mech. Min., 57(1), 119-131.
17 Wasantha, P.L.P., Ranjith, P.G. and Shao, S.S. (2014), "Energy monitoring and analysis during deformation of bedded-sandstone: Use of acoustic emission", Ultrasonics, 54(1), 217-226.   DOI
18 Whittles, D.N., Kingman, S., Lowndes, I. and Jackson, K. (2006), "Laboratory and numerical investigation into the characteristics of rock fragmentation", Miner. Eng., 19(14), 1418-1429.   DOI
19 Yang, L., Yang, R., Qu, G. and Zhang, Y. (2014), "Caustic study on blast-induced wing crack behaviors in dynamic-static superimposed stress field", Int. J Min. Sci. Technol., 24(4), 417-423.   DOI
20 Xie, H.P., Li, L.Y., Ju, Y., Peng, R.D. and Yang, Y.M. (2011), "Energy analysis for damage and catastrophic failure of rocks", Sci. China-Technol. Sci., 54(Suppl. 1), 199-209.   DOI
21 Zhou, Y.X., Xia, K., Li, X.B., Li, H.B., Ma, G.W., Zhao, J., Zhou, Z.L. and Dai, F. (2012), "Suggested methods for determining the dynamic strength parameters and mode-I fracture toughness of rock materials", Int. J. Rock. Mech. Min., 49(1), 105-112.   DOI
22 Zhang, Q.B. and Zhao, J. (2014), "A review of dynamic experimental techniques and mechanical behaviour of rock materials", Rock. Mech. Rock. Eng., 47(4), 1411-1478.   DOI
23 Zhang, Z.X., Kou, S.Q., Jiang, L.G. and Lindqvist, P.A. (2000), "Effects of loading rate on rock fracture: fracture characteristics and energy partitioning", Int. J. Rock. Mech. Min., 37(7), 745-762.   DOI