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THE EFFECT of ANISOTROPY on the DYNAMIC PROPERTIES of SCHIST ROCKS

Year 2022, Issue: 049, 92 - 104, 30.06.2022

Abstract

Dynamic elastic properties of rocks such as modulus of elasticity and Poisson’s ratio are important in some design stages of underground and surface engineering structures. Also, anisotropy is that rocks show different strength and deformation properties with the different orientation angles that they gain as a result of the effect of the direction, fabric, microstructure and discontinuities. Different lithological rock units with anisotropy characteristics are encountered in studies carried out in underground and surface engineering structures, and in cases with such characteristics, there are problems in terms of stability.
In this study, the effect of the anisotropic property of rock masses on elastic parameters such as dynamic young modulus and dynamic Poisson’s ratio were investigated. For this purpose; samples with different orientations were obtained from schists, which are metamorphic rocks, at 0°, 15°, 30°, 45°, 60°, 75° and 90°. Experimental studies were carried out to determine the mechanical and physical properties of these samples. Dynamic young modulus and dynamic Poisson's ratio were determined by P and S velocity of wave propagation experiments. With the results obtained, while the young modulus and Poisson’s ratio of samples belonging to the green schist rock unit with different orientations show a relatively stable structure, these values for the mica schist unit are quite variable and wavy. Therefore, the anisotropy feature of the rock must be taken into consideration in terms of the stability of the structure in engineering studies to be carried out in the mica schist unit.

References

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  • [2] Saroglou, H. and Tsiambaos, G., (2007), Classification of anisotropic rocks 11th Congress of the International Society for Rock Mechanics (Lisbon, Portugal: ISRM), 191–196.
  • [3] Saroglou, H. and Tsiambaos, G., (2008), A modified Hoek–Brown failure criterion for anisotropic intact rock, Int. J. Rock Mech. Min. Sci., 45, 223–234.
  • [4] Zhang, X-P., Wong, L.N., Wang, S-J. and Han, G-Y., (2011), Engineering properties of quartz mica schist Eng. Geol., 121, 135–149.
  • [5] Gao, Q., Tao, J., Hu, J. and Yu, X., (2015), Laboratory study on the mechanical behaviours of an anisotropic shale rock, J. Rock Mech. Geotech. Eng., 7, 213–219.
  • [6] Corbett, D., (2016), Advances in ultrasonic testing - Research into the application of dry point contact transducers, 19th World Conference on Non-Destructive Testing 2016 Advances (Munich, Germany.), 1–7.
  • [7] ISRM., (2007), The complete ISRM suggested methods for rock characterization, testing and monitoring:, 1974-2006, ed R Ulusay and J A Hudson (Ankara: Kozan Ofset).
  • [8] Wang, Y. and Li, C.H., (2017), Investigation of the P and S wave velocity anisotropy of a Longmaxi formation shale by real-time ultrasonic and mechanical experiments under uniaxial deformation ,J. Pet. Sci. Eng., 158, 253–267.
  • [9] Ribacchi, R., Rotonda, T., Totaro, L. and Zaninetti, A., (1999), Evaluation of intrinsic and crack-induced elastic anisotropy in a gneissic rock, 9th ISRM Congress (Paris, France.), 661–666.
  • [10] Khandelwal, M. and Singh, T. N., (2009), Correlating static properties of coal measures rocks with P-wave velocity, Int. J. Coal Geol., 79, 55–60.
  • [11] Kim, H., Cho, J-W., Song, I. and Min, K-B., (2012), Anisotropy of elastic moduli, P-wave velocities, and thermal conductivities of Asan Gneiss, Boryeong Shale and Yeoncheon Schist in Korea, Eng. Geol., 147–148, 68–77.
  • [12] Ali, E., Guang, W., Zhiming, Z. and Weixue, J., (2014), Assessments of strength anisotropy and deformation behaviour of banded amphibolite rocks, Geotech. Geol. Eng., 32, 429–438.
  • [13] Huang, L., Liu, X., Yan, S., Xiong, J., He, H. and Xiao, P., (2020), Experimental study on the acoustic propagation and anisotropy of coal rocks, Petroleum.
  • [14] Yıldız, H., Günay, K., Şahin, Ş., Niğdeli, S.F. and İçli, M.Y., (2014), Hanönü (Kastamonu) Copper Site (Ar: 201300022) mining geology report based on discoverıng request (Ankara).
  • [15] Günay, K., Dönmez, C., Oyan, V., Yıldırım, N., Çiftçi, E., Yıldız, H. and Özkümüş, S., (2018), Geology and geochemistry of sediment-hosted Hanönü massive sulfide deposit (Kastamonu–Turkey), Ore Geol. Rev., 101, 652–674.
  • [16] Özdemir, M., Beyhan, S. and Erarslan, K., (2020), Effect of anisotropic structure on strength in metamorphic rocks, ISRM International Symposium-EUROCK 2020, 1–10.
  • [17] Özdemir, M., (2021), Slope stability analyzes in metamorphic rock masses with anisotropic behaviour, PhD Thesis, Kütahya Dumlupinar University, Institute of Graduate Programs, Kütahya, 154.
Year 2022, Issue: 049, 92 - 104, 30.06.2022

Abstract

References

  • [1] Ramamurthy, T., Rao, G.V. and Singh, J., (1993), Engineering behaviour of phyllites Eng. Geol., 33, 209–225.
  • [2] Saroglou, H. and Tsiambaos, G., (2007), Classification of anisotropic rocks 11th Congress of the International Society for Rock Mechanics (Lisbon, Portugal: ISRM), 191–196.
  • [3] Saroglou, H. and Tsiambaos, G., (2008), A modified Hoek–Brown failure criterion for anisotropic intact rock, Int. J. Rock Mech. Min. Sci., 45, 223–234.
  • [4] Zhang, X-P., Wong, L.N., Wang, S-J. and Han, G-Y., (2011), Engineering properties of quartz mica schist Eng. Geol., 121, 135–149.
  • [5] Gao, Q., Tao, J., Hu, J. and Yu, X., (2015), Laboratory study on the mechanical behaviours of an anisotropic shale rock, J. Rock Mech. Geotech. Eng., 7, 213–219.
  • [6] Corbett, D., (2016), Advances in ultrasonic testing - Research into the application of dry point contact transducers, 19th World Conference on Non-Destructive Testing 2016 Advances (Munich, Germany.), 1–7.
  • [7] ISRM., (2007), The complete ISRM suggested methods for rock characterization, testing and monitoring:, 1974-2006, ed R Ulusay and J A Hudson (Ankara: Kozan Ofset).
  • [8] Wang, Y. and Li, C.H., (2017), Investigation of the P and S wave velocity anisotropy of a Longmaxi formation shale by real-time ultrasonic and mechanical experiments under uniaxial deformation ,J. Pet. Sci. Eng., 158, 253–267.
  • [9] Ribacchi, R., Rotonda, T., Totaro, L. and Zaninetti, A., (1999), Evaluation of intrinsic and crack-induced elastic anisotropy in a gneissic rock, 9th ISRM Congress (Paris, France.), 661–666.
  • [10] Khandelwal, M. and Singh, T. N., (2009), Correlating static properties of coal measures rocks with P-wave velocity, Int. J. Coal Geol., 79, 55–60.
  • [11] Kim, H., Cho, J-W., Song, I. and Min, K-B., (2012), Anisotropy of elastic moduli, P-wave velocities, and thermal conductivities of Asan Gneiss, Boryeong Shale and Yeoncheon Schist in Korea, Eng. Geol., 147–148, 68–77.
  • [12] Ali, E., Guang, W., Zhiming, Z. and Weixue, J., (2014), Assessments of strength anisotropy and deformation behaviour of banded amphibolite rocks, Geotech. Geol. Eng., 32, 429–438.
  • [13] Huang, L., Liu, X., Yan, S., Xiong, J., He, H. and Xiao, P., (2020), Experimental study on the acoustic propagation and anisotropy of coal rocks, Petroleum.
  • [14] Yıldız, H., Günay, K., Şahin, Ş., Niğdeli, S.F. and İçli, M.Y., (2014), Hanönü (Kastamonu) Copper Site (Ar: 201300022) mining geology report based on discoverıng request (Ankara).
  • [15] Günay, K., Dönmez, C., Oyan, V., Yıldırım, N., Çiftçi, E., Yıldız, H. and Özkümüş, S., (2018), Geology and geochemistry of sediment-hosted Hanönü massive sulfide deposit (Kastamonu–Turkey), Ore Geol. Rev., 101, 652–674.
  • [16] Özdemir, M., Beyhan, S. and Erarslan, K., (2020), Effect of anisotropic structure on strength in metamorphic rocks, ISRM International Symposium-EUROCK 2020, 1–10.
  • [17] Özdemir, M., (2021), Slope stability analyzes in metamorphic rock masses with anisotropic behaviour, PhD Thesis, Kütahya Dumlupinar University, Institute of Graduate Programs, Kütahya, 154.
There are 17 citations in total.

Details

Primary Language English
Subjects Engineering
Journal Section Research Articles
Authors

Mehmet Özdemir 0000-0002-8164-8874

Sunay Beyhan 0000-0002-6893-9298

Kaan Erarslan 0000-0002-1875-4009

Publication Date June 30, 2022
Submission Date April 13, 2022
Published in Issue Year 2022 Issue: 049

Cite

IEEE M. Özdemir, S. Beyhan, and K. Erarslan, “THE EFFECT of ANISOTROPY on the DYNAMIC PROPERTIES of SCHIST ROCKS”, JSR-A, no. 049, pp. 92–104, June 2022.