Effects of microwave heating on mechanical properties and energy evolution mechanism of granite under conventional triaxial compression
DOI:
https://doi.org/10.21152/1750-9548.16.4.407Abstract
To explore the influences of microwave irradiation on the mechanical response mechanism of rock under different confining pressures, granite specimens were subjected to different microwave heating paths, then conventional triaxial compression experiments were conducted. The experimental results show that: 1) As microwave irradiation power and time increase, the density and P-wave velocity of the specimen show a downward trend and the higher the power, the faster the decline; 2) The sensitivity of specimen strength to confining pressure and microwave (power and time) is ranked thus (in descending order): confining pressure, microwave power, then irradiation time. Under a low confining pressure, the strength value of the specimen exhibits a decreased trend with the increase of irradiation time, but with the increase of confining pressure, the change of the strength of the specimen tended to be consistent; 3) The strain energy evolution of the specimen is similar, it is mainly manifested in energy accumulation before the peak, and energy dissipation and release thereafter. Under the influence of microwave radiation, the evolution of dissipation ratio shows a significant microwave effect, but the microwave effect becomes weaker with the increase of confining pressure. Therefore, when using microwave rock-breaking techniques, combined with necessary pressure-relief technique, microwave irradiation can produce the best rock-breaking effect.
References
Li, X.B., Zhou, Z.L., Wang, W.H., The status and prospect of development in rock fargmentation engineering. 2009-2010 Report on Advances in Rock Mechanics and Rock Engineering. Beijing, China, 2010, p. 152-159+217-218.
Haque, K.E., Microwave energy for mineral treatment processes--A brief review. International Journal of Mineral Processing, 1999, 57(1): p. 1-24. https://doi.org/10.1016/S0301-7516(99)00009-5
Ali, A. Y., & Bradshaw, S. M., Confined particle bed breakage of microwave treated and untreated ores. Minerals Engineering, 2011, 24(14): 1625-1630. https://doi.org/10.1016/j.mineng.2011.08.020
Chen, T. T., Dutrizac, J. E., Haque, K. E., Wyslouzil, W., & Kashyap, S., The relative transparency of minerals to microwave radiation. Canadian Metallurgical Quarterly, 1984, 23(3): 349-351. https://doi.org/10.1179/cmq.1984.23.3.349
Hartlieb, P., Leindl, M., Kuchar, F., Antretter, T., & Moser, P., Damage of basalt induced by microwave irradiation. Minerals Engineering, 2012, 31: 82-89. https://doi.org/10.1016/j.mineng.2012.01.011
Hartlieb, P., Toifl, M., Kuchar, F., Meisels, R., & Antretter, T., Thermo-physical properties of selected hard rocks and their relation to microwave-assisted comminution. Minerals Engineering, 2016, 91: 34-41. https://doi.org/10.1016/j.mineng.2015.11.008
Zhao, Q.H., Zhao, X.B., Zheng, Y.L., Li, J.C., He, L., Liu, H.W., Yu, J.W., A review on mineral heating characteristics and rock weakening effect under microwave irradiation. Geological Journal of China Universities, 2020, 26(3): p. 350-360. https://doi.org/10.16108/j.issn1006-7493.2019041
Zeng, J.S., Hu, Q.J., Chen, Y., Shu, X.Y., Chen, S.Z., He, L.P., Tang, H.X., Lu, X.R., Experimental investigation on structural evolution of granite at high temperature induced by microwave irradiation. Mineralogy and Petrology, 2019, 113: p. 745-754. https://doi.org/10.1007/s00710-019-00681-z
Wei, W., Shao, Z.S., Zhang, Y.Y., Qiao, R.J., Gao, J.P., Fundamentals and Applications of Microwave Energy in Rock and Concrete Processing -A Review. Applied Thermal Engineering, 2019, 157: p. 113751. https://doi.org/10.1016/j.applthermaleng.2019.113751
Farahat, M., Elmahdy, A.M., Hirajima, T., Influence of microwave radiation on the magnetic properties of molybdenite and arsenopyrite. Powder Technology, 2017, 315: p. 276-281. https://doi.org/10.1016/j.powtec.2017.04.023
Estel, L., Poux, M., Benamara, N., Polaert, I., Continuous flowmicrowave reactor: Where are we. Chemical Engineering and Processing: Process Intensification, 2017, 113: p. 56-64. https://doi.org/10.1016/j.cep.2016.09.022
Batchelor, A. R., Jones, D. A., Plint, S., & Kingman, S. W., Deriving the ideal ore texture for microwave treatment of metalliferous ores. Minerals Engineering, 2015, 84: 116-129. https://doi.org/10.1016/j.mineng.2015.10.007
Hartlieb, P., & Grafe, B. 2017. Experimental study on microwave assisted hard rock cutting of granite. BHM Berg- und Hüttenmännische Monatshefte, 162(2): 77-81. https://doi.org/10.1007/s00501-016-0569-0
Peinsitt, T., Kuchar, F., Hartlieb, P., Moser, P., Kargl, H., Restner, U., & Sifferlinger, N., Microwave heating of dry and water saturated basalt, granite and sandstone. International Journal of Mining and Mineral Engineering, 2010, 21(1): p. 18-29. https://doi.org/10.1504/IJMME.2010.031810
Lu, G.M., Feng, X.T., Li, Y.H., Hassani, F., Zhang, X.W., Experimental Investigation on the Effects of Microwave Treatment on Basalt Heating, Mechanical Strength, and Fragmentation. Rock Mechanics and Rock Engineering, 2019, 52: p. 2535-2549. https://doi.org/10.1007/s00603-019-1743-y
Lu, G.M., Feng, X.T., Li, Y.H., Zhang, X.W., The Microwave-Induced Fracturing of Hard Rock. Rock Mechanics and Rock Engineering, 2019, 52: p. 3017-3032. https://doi.org/10.1007/s00603-019-01790-z
Lu, G.M., Li, Y.H., Hassani, F., Zhang, X.W., The influence of microwave irradiation on thermal properties of main rock-forming minerals. Applied Thermal Engineering, 2017, 112: p. 1523-1532. https://doi.org/10.1016/j.applthermaleng.2016.11.015
Nicco, M., Holley, E.A., Hartlieb, P., Kaunda, R., Nelson, P.P., Methods for Characterizing Cracks Induced in Rock. Rock Mechanics and Rock Engineering, 2018, 51: p. 2075-2093. https://doi.org/10.1007/s00603-018-1445-x
Hassani, F., Nekoovaght, P.M., Gharib, N., The influence of microwave irradiation on rocks for microwave assisted underground excavation. Journal of Rock Mechanics and Geotechnical Engineering, 2016, 8(1): p. 1-15. https://doi.org/10.1016/j.jrmge.2015.10.004
Hassani, F., Nekoovaght, P.M., Radziszewski, P., Waters, K.E., Microwave assisted mechanical rock breaking. Proceedings of the 12th ISRM International Congress on Rock Mechanics. Beijing, China, 2011, p. 2075-2080 https://doi.org/10.1201/b11646-395
Kingman, S.W., Vorster, W., Rowson, N.A., The influence of mineralogy on microwave assisted grinding. Minerals Engineering, 2000, 13(3): p. 313-327. https://doi.org/10.1016/S0892-6875(00)00010-8
Vorster, W., Rowson, N.A., Kingman, S.W., The effect of microwave radiation upon the processing of Neves Corvo copper ore. International Journal of Mineral Processing, 2001, 63(1): p. 29-44. https://doi.org/10.1016/S0301-7516(00)00069-7
Dai, J., Song, S.D., Tu, B.B., Gao, Y.Z., Du, W.P., Influence of granite strength under different microwave irradiation parameters. Science Technology and Engineering, 2017, 17(18): p. 188-192.
Batchelor, A.R., Jones, D.A., Plint, S., Kingman, S.W., Deriving the ideal ore texture for microwave treatment of metalliferous ores. Minerals Engineering, 2015, 84: p. 116-129. https://doi.org/10.1016/j.mineng.2015.10.007
https://doi.org/10.1016/j.mineng.2015.10.007
Hartlieb, P., Toifl, M., Kuchar, F., Meisels, R., Antretter, T., Thermo-physical properties of selected hard rocks and their relation to microwave-assisted comminution. Minerals Engineering, 2016, 91: p. 34-41. https://doi.org/10.1016/j.mineng.2015.11.008
Rizmanoski, V., The effect of microwave pretreatment on impact breakage of copper ore. Minerals Engineering, 2011, 24(14): p. 1609-1618. https://doi.org/10.1016/j.mineng.2011.08.017
Toifl, M., Meisels, R., Hartlieb, P., Kuchar, F, Antretter, T., 3D numerical study on microwave induced stresses in inhomogeneous hard rocks. Minerals Engineering, 2016, 90: p. 29-42. https://doi.org/10.1016/j.mineng.2016.01.001
Yang, J.M., Study on evolutionary mechanism of energy field and support mechanism of energy-absorbing bolt in deep roadway [D]. University of Science and Technology Beijing, 2020.
Zhao, Z.H., Xie, H.P., Energy transfer and energy dissipation in rock deformation and fracture. Advanced Engineering Sciences, 2008, 40(02): p. 26-31.
Xie, H.P., Ju, Y., Li, L.Y., Peng, R.D., Energy mechanism of deformation and failure of rock masses. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(9): p. 1729-1740.
Published
How to Cite
Issue
Section
Copyright (c) 2022 J Yang L Qiao, X Li, Q Li, W Wang

This work is licensed under a Creative Commons Attribution 4.0 International License.