Similar articles

Abstract: triaxial compression tests were carried out on red sandstone samples which had been previously subjected to heat treatments at 20, 200, 400, and 600 °C to study the change in properties and mechanical characteristics of the rock and the permeability (gas) evolution. Results show that: (1) the color of the sandstone changes from gray to brownish red with incremental change of temperature; (2) the strength of the rock increases with heat treatments from 20 to 200 °C and decreases with heat treatments from 200 to 600 °C, while the permeability of the rock after the heat treatments changes in the opposite trend; (3) from 20 to 200 °C, the primary pores and cracks close gradually, which results in the strength and elastic modulus increasing and permeability of the rock after the heat treatment decreasing; from 200 to 600 °C, the degradation of the sandstone causes the fall in strength and elastic modulus, and the rise in strain corresponding to the peak stress and permeability of the rock after the heat treatment; (4) the permeability in a stress-strain process varies with the evolution of cracks; (5) when the heating temperature is beyond 800 °C, the sandstone is seriously thermally damaged.

Research on mechanical properties and permeability evolution of sandstone after heat treatment is important to some rock engineering applications such as sandstone reservoir, oil and gas enhanced recovery, underground coal gasification. This paper described experimental results of triaxial compression testing with gas permeability measurement on red sandstones after thermal treatment of 200, 400 and 600°C. The results are very interesting.

热处理后红砂岩力学性能及渗透性演化规律三轴试验研究

[1]Abdulagatova, Z., Abdulagatov, I.M., Emirov, V.N., 2009. Effect of temperature and pressure on the thermal conductivity of sandstone. International Journal of Rock Mechanics and Mining Sciences, 46(6):1055-1071.

[2]Brace, W.F., Walsh, J.B., Frangos, W.T., 1968. Permeability of granite under high pressure. Journal of Geophysical Research, 73(6):2225-2236.

[3]Cai, M., Kaiser, P.K., Tasaka, Y., et al., 2004. Generalized crack initiation and crack damage stress thresholds of brittle rock masses near underground excavations. International Journal of Rock Mechanics and Mining Sciences, 41(5):833-847.

[4]Chaki, S., Takarli, M., Agbodjan, W.P., 2008. Influence of thermal damage on physical properties of a granite rock: porosity, permeability and ultrasonic wave evolutions. Construction and Building Materials, 22(7):1456-1461.

[5]Chen, L.J., Zhao, H.B., Gu, H.T., et al., 2005. Study on microstructure of coal roof sandstone under high temperature. Journal of China University of Mining and Technology, 34(4):443-446 (in Chinese).

[6]Fortin, J., Schubnel, A., Guéguen, Y., 2005. Elastic wave velocities and permeability evolution during compaction of Bleurswiller sandstone. International Journal of Rock Mechanics and Mining Sciences, 42(7-8):873-889.

[7]Fortin, J., Stanchits, S., Vinciguerra, S., et al., 2011. Influence of thermal and mechanical cracks on permeability and elastic wave velocities in a basalt from Mt. Etna volcano subjected to elevated pressure. Tectonophysics, 503(1-2):60-74.

[8]Géraud, Y., Mazerolle, F., Raynaud, A., 1992. Comparison between connected and overall porosity of thermally stressed granites. Journal of Structural Geology, 14(8-9):981-990.

[9]Guéguen, Y., Schubnel, A., 2003. Elastic wave velocities and permeability of cracked rocks. Tectonophysics, 370(1-4):163-176.

[10]Kapusta, K., Stańczyk, K., Wiatowski, M., et al., 2013. Environmental aspects of a field-scale underground coal gasification trial in a shallow coal seam at the Experimental Mine Barbara in Poland. Fuel, 113:196-208.

[11]Luo, W., Qin, Y.P., Zhang, M.M., et al., 2011. Test study on permeability properties of the sandstone specimen under triaxial stress condition. Procedia Engineering, 26:173-178.

[12]Mao, X.B., Zhang, L.Y., Li, T.Z., et al., 2009. Properties of failure mode and thermal damage for limestone at high temperature. Mining Science and Technology, 19(3):290-294.

[13]Martin, C.D., 1993. The Strength of Massive Lac du Bonnet Granite around Underground Openings. PhD Thesis, University of Manitoba, Manitoba, Canada.

[14]McKinley, I.G., Neall, F.B., Kawamura, H., et al., 2006. Geochemical optimisation of a disposal system for high-level radioactive waste. Journal of Geochemical Exploration, 90(1-2):1-8.

[15]Minchener, A.J., 2005. Coal gasification for advanced power generation. Fuel, 84(17):2222-2235.

[16]Monfared, M., Delage, P., Sulem, J., et al., 2011. A new hollow cylinder triaxial cell to study the behavior of geo-materials with low permeability. International Journal of Rock Mechanics and Mining Sciences, 48(4):637-649.

[17]Ranjith, P.G., Daniel, R.V., Bai, J.C., et al., 2012. Transformation plasticity and the effect of temperature on the mechanical behaviour of Hawkesbury sandstone at atmospheric pressure. Engineering Geology, 151:120-127.

[18]Scheidegger, A.E., 1974. The Physics of Flow through Porous Media. University of Toronto Press, Toronto, Canada, p.102.

[19]Seibt, P., Kellner, T., 2003. Practical experience in the reinjection of cooled thermal waters back into sandstone reservoirs. Geothermics, 32(4-6):733-741.

[20]Sengun, N., 2014. Influence of thermal damage on the physical and mechanical properties of carbonate rocks. Arabian Journal of Geosciences, 7(12):5543-5551.

[21]Shafiei, A., Dusseault, M.B., 2013. Geomechanics of thermal viscous oil production in sandstones. Journal of Petroleum Science and Engineering, 103:121-139.

[22]Shang, X.Y., Zhou, G.Q., Lu, Y., 2015. Stress-dependent undrained shear behavior of remolded deep clay in East China. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 16(3):171-181.

[23]Takarli, M., Prince-Agbodjan, W., 2008. Temperature effects on physical properties and mechanical behavior of granite: experimental investigation of material damage. Journal of ASTM International, 5(3):JAI100464.

[24]Tian, H., Kempka, T., Xu, N.X., et al., 2012. Physical properties of sandstones after high temperature treatment. Rock Mechanics and Rock Engineering, 45(6):1113-1117.

[25]Timoshenko, S., Goodier, J.N., 1951. Theory of Elasticity. McGraw-Hill Book Company, New York, USA, p.7.

[26]Ulusay, R., Hudson, J.A., 2007. The complete ISRM suggested methods for rock characterization, testing and monitoring: 1974-2006. ISRM Turkish National Group, Ankara, Turkey.

[27]Wu, X.D., Liu, J.R., Qin, J.S., 2003. Effects of thermal treatment on wave velocity as well as porosity and permeability of rock. Journal of China University of Petroleum (Edition of Natural Sciences), 27(4):70-72 (in Chinese).

[28]Wu, Z., Qin, B.D., Chen, L.J., et al., 2005. Experimental study on mechanical character of sandstone of the upper plank of coal bed under high temperature. Chinese Journal of Rock Mechanics and Engineering, 24(11):1863-1867 (in Chinese).

[29]Yang, L.H., Zhang, X., Liu, S.Q., et al., 2008. Field test of large-scale hydrogen manufacturing from underground coal gasification (UCG). International Journal of Hydrogen Energy, 33(4):1275-1285.

[30]Yin, T.B., Li, X.B., Yin, Z.Q., et al., 2012. Study and comparison of mechanical properties of sandstone under static and dynamic loadings after high temperature. Chinese Journal of Rock Mechanics and Engineering, 31(2):273-279 (in Chinese).

[31]Zou, C.N., Zhu, R.K., Liu, K.Y., et al., 2012. Tight gas sandstone reservoirs in China: characteristics and recognition criteria. Journal of Petroleum Science and Engineering, 88-89:82-91.

[32]Zuo, J.P., Xie, H.P., Zhou, H.W., 2012. Investigation of meso-failure behavior of rock under thermal-mechanical coupled effects based on high temperature SEM. Science China Physics, Mechanics & Astronomy, 55(10):1855-1862.