Geomechanics and Engineering

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Simulation study on the mechanical properties and failure characteristics of rocks with double holes and fractures

  • Pan, Haiyang (State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology) ;
  • Jiang, Ning (State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology) ;
  • Gao, Zhiyou (College of Energy and Mining Engineering, Ministry of Education, Shandong University of Science and Technology) ;
  • Liang, Xiao (Shandong Geology and Mineral Resources Engineering Group Co., Ltd.) ;
  • Yin, Dawei (State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology)
  • Received : 2021.12.26
  • Accepted : 2022.05.26
  • Published : 2022.07.10
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Abstract

With the exploitation of natural resources in China, underground resource extraction and underground space development, as well as other engineering activities are increasing, resulting in the creation of many defective rocks. In this paper, uniaxial compression tests were performed on rocks with double holes and fractures at different angles using particle flow code (PFC2D) numerical simulations and laboratory experiments. The failure behavior and mechanical properties of rock samples with holes and fractures at different angles were analyzed. The failure modes of rock with defects at different angles were identified. The fracture propagation and stress evolution characteristics of rock with fractures at different angles were determined. The results reveal that compared to intact rocks, the peak stress, elastic modulus, peak strain, initiation stress, and damage stress of fractured rocks with different fracture angles around holes are lower. As the fracture angle increases, the gap in mechanical properties between the defective rock and the intact rock gradually decreased. In the force chain diagram, the compressive stress concentration range of the combined defect of cracks and holes starts to decrease, and the model is gradually destroyed as the tensile stress range gradually increases. When the peak stress is reached, the acoustic emission energy is highest and the rock undergoes brittle damage. Through a comparative study using laboratory tests, the results of laboratory real rocks and numerical simulation experiments were verified and the macroscopic failure characteristics of the real and simulated rocks were determined to be similar. This study can help us correctly understand the mechanical properties of rocks with defects and provide theoretical guidance for practical rock engineering.

Keywords

Acknowledgement

This work was supported by National Natural Science Foundation of China (52004146, 52074169, 52174159, 51904167); Natural Science Fundation Youth Branch of Shandong Province (ZR2020QE102); the Research Fund of Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education (KLDCRM202102); the 2020 Joint Fund for the Project of the State Key Laboratory of Coal Resources and Safe Mining- Outstanding Young Scientists Program of Beijing Higher Education Institutions (SKLCRSM20LH04) and SDUST Research Fund (2019TDJH101).

References

  1. Bahaaddini, M. and Sharrock, G. (2013), "Numerical investigation of the effect of joint geometrical parameters on the mechanical properties of a non-persistent jointed rock mass under uniaxial compression", Comput. Geotech., 49, 206-225. https://doi.org/10.1016/j.compgeo.2012.10.012.
  2. Chen, S., Xia, Z., Feng, F. and Yin, D. (2020), "Numerical study on strength and failure characteristics of rock samples with different hole defects", B Eng Geol Environ., 80(7), 1-18. https://doi.org/10.1007/s10064-020-01964-y.
  3. Cho, N., Martin, C.D. and Sego, D.C. (2007), "A clumped particle model for rock", Int. J. Rock Mech. Min., 44(7), 997-1010. https://doi.org/10.1016/j.ijrmms.2007.02.002.
  4. Chung, J., Lee, H. and Kwon, S. (2019), "Numerical investigation of radial strain-controlled uniaxial compression test of aspo diorite in grain-based model", Rock Mech. Rock Eng., 52(10), 3659-3674. https://doi.org/10.1007/s00603-019-01838-0.
  5. Cundall, P.A. and Strack, O.D. (1979), "A discreate numerical model for granula assemblies", Geotechnique., 29(1), 47-65. https://doi.org/10.1680/geot.1979.29.1.47.
  6. Estrada, J.M. and Bhamidimarri, R. (2016), "A review of the issues and treatment options for wastewater from shale gas extraction by hydraulic fracturing", Fuel., 182, 292-303. https://doi.org/10.1016/j.fuel.2016.05.051.
  7. Li, D., Han, Z., Sun, X., Zhou, T. and Li, X. (2018), "Dynamic mechanical properties and fracturing behavior of marble specimens containing single and double flaws in shpb tests", Rock Mech. Rock Eng., 52(6), 1623-1643. https://doi.org/10.1007/s00603-018-1652-5.
  8. Li, J., Zhou, Y., Sun, W. and Sun, Z. (2019), "Effect of the interaction between cavities and flaws on rock mechanical properties under uniaxial compression", Adv. Mater. Sci. Eng., 2019, 1-9. https://doi.org/10.1155/2019/1242141.
  9. Li, K.G., Yang, B.W. and Li, X.X. (2017), "Effect of native fissures on the mechanical behaviour of rock under uniaxial compression", Teh Vjesn., 24(3), 907-915. https://doi.org/10.17559/TV-20170523104531.
  10. Li, R., Wang, Y.S. and Fu, F.F. (2019), "Research on fatigue damage and affecting factors of defected rock mass based on ultrasonic wave velocity", The. Vjesn., 26(4), 1061-1067. https://doi.org/10.17559/TV-20190228065832.
  11. Lisjak, A. and Grasselli, G. (2014), "A review of discrete modeling techniques for fracturing processes in discontinuous rock masses", J. Rock Mech. Geotech., 6(4), 301-314. https://doi.org/10.1016/j.jrmge.2013.12.007.
  12. Mohammadi, M. and Tavakoli, H. (2015), "Comparing the generalized Hoek-Brown and Mohr-Coulomb failure criteria for stress analysis on the rocks failure plane", Geomech. Eng., 9(1), 115-124. https://doi.org/10.12989/gae.2015.9.1.115.
  13. Nicksiar, M. and Martin, C.D. (2014), "Factors Affecting Crack Initiation in Low Porosity Crystalline Rocks", Rock Mech. Rock Eng., 47(4), 1165-1181. https://doi.org/10.1007/s00603-013-0451-2.
  14. Tan, Y., Cheng, H., Gong, S., Bai E.H., Shao M.C., Hao, B.Y., Li, X.S. and Xu, H. (2021), "Field study on the law of surface subsidence in the high-intensity fully mechanized caving mining working face with shallow thick bedrock and thin epipedon in hilly areas", Adv. Mater. Sci. Eng., 2021, 13. https://doi.org/10.1155/2021/6515245.
  15. Tan, Y., Xu, H., Yan, W.T., Guo, W.B., Bai, E.H., Qi, T.Y., Yin, D.W., Hao, B.Y., Cheng, H. and Shao, M.H. (2022), "Study on the overburden failure law of high-intensity mining in gully areas with exposed bedrock", Front Earth Sc-Switz., 10, 833384. https://doi.org/10.3389/feart.2022.833384.
  16. Tan, Y., Xu, H., Yan, W.T., Guo, W.B., Sun, Q., Yin, D.W., Zhang, Y.J., Zhang, X.Q., Jing, X.F., Wei. S.J. and Liu, X. (2022), "Development law of water conducting fracture zone in the fully mechanized caving face of gob-side entry driving: A case study", Minerals-Basel, 12:557. https://doi.org/10.3390/min12050557.
  17. Usol'Tseva, O.M. and Tsoi, P.A. (2021), "The influence of size effect on strength and deformation characteristics of different types of rock samples", Environ. Earth Sci., 720(1), 12-89. https://doi.org/10.1088/1755-1315/720/1/012089.
  18. Wang, C., Zhang, S., Zhang, B., Sun, J. and Chen, L. (2020), "Failure characteristics and physical signals of jointed rock: an experimental investigation", Arab. J. Geosci., 13(14). https://doi.org/10.1007/s12517-020-05675-2.
  19. Wang, C.X., Shen, B.T., Chen, J.T., Tong, W.X., Jiang, Z., Liu, Y. and Li, Y.Y. (2020), "Compression characteristics of filling gangue and simulation of mining with gangue backfilling: An experimental investigation", Geomech. Eng., 20(6), 485-495. https://doi.org/10.12989/gae.2020.20.6.485.
  20. Wang, J., Apel, D.B., Dyczko, A., Walentek, A., Prusek, S., Xu, H., and Wei, C. (2021), "Investigation of the rockburst mechanism of driving roadways in close-distance coal seam mining using numerical modeling method", Min. Metall. Explor, 38(5), 1899-1921. https://doi.org/10.1007/s42461-021-00471-2.
  21. Wang, J., Apel, D.B., Pu, Y., Hall, R., Wei, C. and Sepehri, M. (2021), "Numerical modeling for rockbursts: A state-of-the-art review", J. Rock Mech. Geotech., 13(2), 457-478. https://doi.org/10.1016/j.jrmge.2020.09.011.
  22. Wang, X. and Tian, L.G. (2018), "Mechanical and crack evolution characteristics of coal-rock under different fracture-hole conditions: a numerical study based on particle flow code", Environ. Earth Sci., 77(8), 297. https://doi.org/10.1007/s12665-018-7486-3.
  23. Wang, X., Wen, Z.J. and Jiang, Y.J., (2016), "Time-space efect of stress feld and damage evolution law of compressed coal-rock", Geotech. Geol. Eng., 34(6), 1933-1940. https://doi.org/10.1007/s10706-016-0074-y.
  24. Wang, X.F., Xia, Z.G., Li, P. and Liu, H.N. (2021), "Numerical study on strength and failure behavior of rock with composite defects under uniaxial compression", Energies., 14(15). https://doi.org/10.3390/en14154418.
  25. Wei, Z., Yang, S.Q. and Tian, W.L. (2018), "Experimental and numerical investigation of brittle sandstone specimens containing different shapes of holes under uniaxial compression", Eng. Fract. Mech., 200, 430-450. https://doi.org/10.1016/j.engfracmech.2018.08.016.
  26. Wu, T.H., Gao, Y.T., Zhou, Y. and Li, J.W. (2020), "Experimental and numerical study on the interaction between holes and fissures in rock-like materials under uniaxial compression", Theor. Appl. Fract. Mech., 106. https://doi.org/10.1016/j.tafmec.2020.102488.
  27. Yin, D.W., Chen, S.J., Sun, X.Z. and Jiang, N. (2021), "Effects of interface angles on properties of rock-cemented coal gangue-fly ash backfill bi-materials", Geomech. Eng., 24(1), 81-89. https://doi.org/10.12989/gae.2021.24.1.081.
  28. Zhang, Q., Wang, X., Tian, L.G. and Huang, D.M. (2018), "Analysis of mechanical and acoustic emission characteristics of rock materials with double-hole defects based on particle flow code", Shock Vib., 2018(9), 1-11. https://doi.org/10.1155/2018/7065029.
  29. Zhao, T.B., Guo, W.Y., Liu, C.P. and Zhao, G.M. (2016), "Failure characteristics of combined coal-rock with different interfacial angles", Geomech. Eng., 11(3), 345-359. https://doi.org/10.12989/gae.2016.11.3.345.
  30. Zhu, D., Jing, H.W., Yin, Q., Zong, Y.J. and Tao, X.L. (2018), "Experimental study on mechanical characteristics of sandstone containing arc fissures", Arab. J. Geosci., 11(20), 1-10. https://doi.org/10.1007/s12517-018-3991-7.
  31. Zhu, J.B., Zhou, T., Liao, Z.Y., Sun, L., Li, X.B. and Chen, R. (2018), "Replication of internal defects and investigation of mechanical and fracture behaviour of rock using 3d printing and 3d numerical methods in combination with x-ray computerized tomography", Int. J. Rock Mech. Min., 106, 198-212. https://doi.org/10.1016/j.ijrmms.2018.04.022.