Abstract: The effects of low temperature gradient on dynamic mechanical properties of coal were examined through Split-Hopkinson Pressure Bar (SHPB) Dynamic Impact Experiment, the law of dynamic mechanical parameters of coal specimen changing from room temperature to negative temperature (25 °C, -5 °C, -10 °C, -15 °C, -20 °C, -30 °C, -40 °C) was analyzed, and the coal-rock stress-strain curve characteristics subject to the low temperature-impact load coupling effect was discussed. The law of the effects of different strain rates on the rock strength properties and the compressive deformation and failure was analyzed by studying the coal specimen at -15 °C. Moreover, the mechanical properties of coal specimen in saturated and dry conditions were compared, and the effects of water and water-ice phase transition on the strength properties of the corresponding coal specimen were analyzed.
References: Inada, Y. & Yokata, K. Some studies of low temperature rock strength[J]. International Journal of Rock Mechanics and Mining Sciences 21(3), 145–153 (1984). (PMID: 10.1016/0148-9062(84)91532-8)
Aoki, K., Hibiya, K. & Yoshida, T. Storage of refrigerated liquefied gases in rock caverns: characteristics of rock under very low temperatures[J]. Tunnelling and Underground Space Technology 5(4), 319–325 (1990). (PMID: 10.1016/0886-7798(90)90126-5)
Yamabe, T. & Neaupane, K. M. Determination of some thermo-mechanical properties of Sirahama sandstone under subzero temperature condition[J]. International Journal of Rock Mechanics and Mining Sciences 38(7), 1029–1034 (2001). (PMID: 10.1016/S1365-1609(01)00067-3)
Dwivedi, R. D. et al. Fracture toughness of rocks under sub-zero temperature conditions[J]. International Journal of Rock Mechanics and Mining Sciences 37(8), 1267–1275 (2000). (PMID: 10.1016/S1365-1609(00)00051-4)
Nakamura, D. et al. Basic study on the frost heave pressure of rocks-dependence of the location of frost heave on the strength of the rock[J]. Journal of MMIJ 127(9), 558–564 (2011). (PMID: 10.2473/journalofmmij.127.558)
Matsuoka, N. Mechanisms of rock breakdown by frost action: an experimental approach[J]. Cold Regions Science and Technology 17(3), 253–270 (1990). (PMID: 10.1016/S0165-232X(05)80005-9)
Mutlutűk, M., Altindag, R. & Tűrk, G. A decay function model for the integrity loss of rock when subjected to recurrent cycles of freezing-thawing and heating-cooling[J]. International Journal of Rock Mechanics and Mining Sciences 41(2), 237–244 (2004). (PMID: 10.1016/S1365-1609(03)00095-9)
Chen, T. C., Yeung, M. R. & Mori, N. Effect of water saturation on deterioration of welded tuff due to freeze-thaw action[J]. Cold Regions Science and Technology 38(2), 127–136 (2004). (PMID: 10.1016/j.coldregions.2003.10.001)
Watanabe, K. Amount of unfrozen water in frozen porous media saturated with solution[J]. Cold Regions Science and Technology 34(2), 103–110 (2002). (PMID: 10.1016/S0165-232X(01)00063-5)
Hall, K. et al. Weathering in cold regions: some thoughts and perspectives[J]. Progress in Physical Geography 26(4), 577–603 (2002). (PMID: 10.1191/0309133302pp353ra)
Hall, K. Rock moisture content in the field and the laboratory and its relationship to mechanical weathering studies[J]. Earth Surface Processes and Landforms 11(2), 131–142 (1986). (PMID: 10.1002/esp.3290110204)
Fukuda, M. Rock weathering by freezing-thawing cycles[J]. Low Temperature Science, Series A 32, 243–249 (1974).
Lautridou, J. P. & Ozouf, J. C. Experimental frost shattering 15 years of research at the Centre de Géomorphologie du CNRS[J]. Progress in Physical Geography 6(2), 215–232 (1982). (PMID: 10.1177/030913338200600202)
Leber, H. Data processing in the Split Hopkinson pressure bar tests. International Journal of Impact Engineering 15(6), 723–733 (1994). (PMID: 10.1016/0734-743X(94)90011-9)
Shan, R. L., Jiang, Y. S. & Li, B. Q. Obtaining dynamic complete stress-strain curves for rock using the Split Hopkinson Pressure Bar technique[J]. International Journal of Rock Mechanics and Mining Sciences 37, 983–992 (2000). (PMID: 10.1016/S1365-1609(00)00031-9)
Shan, R. L. et al. Experimental study of strength characters of saturated red sandstone on negative temperature under triaxial compression [J]. Chinese Journal of Rock Mechanics and Engineering 33((SP2)), 3657–3664 (2014).
Zhao, Y. X. et al. Dynamic tensile strength of coal under dry and saturated conditions. Rock Mechanics and Rock Engineering 49(5), 1709–1720 (2016). (PMID: 10.1007/s00603-015-0849-0)
Yang Y. Experimental Study on Dynamic Mechanical Properties of Rock under Low Temperature [D]. China university of mining and technology, 2016.
Samanta, S. K. Dynamic deformation of aluminium and copper at elevated temperature [J]. Journal of the Mechanics and Physics of Solids 19(3), 117–135 (1971). (PMID: 10.1016/0022-5096(71)90023-8)
Liu, Q. et al. Advance and review on freezing-thawing damage of fractured rock [J]. Chinese Journal of Rock Mechanics and Engineering 34(3), 452–471 (2015).
Processing Request
No Comments.