Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Experimental study of crack propagation of rock-like specimens containing conjugate fractures

  • Sun, Wenbin (State Key Laboratory of Mining Disaster Prevention and Control, College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Du, Houqian (State Key Laboratory of Mining Disaster Prevention and Control, College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Zhou, Fei (State Key Laboratory of Mining Disaster Prevention and Control, College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Shao, Jianli (State Key Laboratory of Mining Disaster Prevention and Control, College of Mining and Safety Engineering, Shandong University of Science and Technology)
  • Received : 2018.11.21
  • Accepted : 2019.02.19
  • Published : 2019.03.20
⟨ Previous Next ⟩

Abstract

The presence of defects in nature changes the physical parameters of the rock. In this paper, by studying the rock-like specimens with conjugated fractures, the horizontal angle and length are changed, and the physical parameters and failure modes of the specimens under uniaxial compression test are analyzed and compared with the results of simulation analysis. The experimental results show that the peak strength and failure mode of the rock-like specimens are closely related to the horizontal angle. When the horizontal angle is $45^{\circ}$, the maximum value is reached and the tensile failure mode is obtained. The fracture length affects the germination and propagation path of the cracks. It is of great significance to study the failure modes and mechanical properties of conjugated fracture rock-like specimens to guide the support of fractured rock on site.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Postdoctoral Science Foundation

References

  1. Bagheripour, M., Rahgozar, R. and Pashnesaz, H. (2011), "A complement to Hoek-Brown failure criterion for strength prediction in anisotropic rock", Geomech. Eng., 3(1), 61-81. https://doi.org/10.12989/gae.2011.3.1.061
  2. Cai, P., Nie, W., Chen, D.W., Yang, S.B. and Liu, Z.Q. (2019), "Effect of air flowrate on pollutant dispersion pattern of coal dust particles at fully mechanized mining face based on numerical simulation", Fuel, 239, 623-635. https://doi.org/10.1016/j.fuel.2018.11.030
  3. Cao, R., Cao, P. and Lin, H. (2017), "Experimental and numerical study of the failure process and energy mechanisms of rock-like materials containing cross unpersistent joints under uniaxial compression", Plos One, 12(12), e0188646. https://doi.org/10.1371/journal.pone.0188646
  4. Da Silva, B.G. and Einstein, H.H. (2013), "Modeling of crack initiation, propagation and coalescence in rocks", Int. J. Fract., 182(2), 167-186. https://doi.org/10.1007/s10704-013-9866-8
  5. Erarslan, N. (2016), "Microstructural investigation of subcritical crack propagation and fracture process zone (FPZ) by the reduction of rock fracture toughness under cyclic loading", Eng. Geol., 208, 181-190. https://doi.org/10.1016/j.enggeo.2016.04.035
  6. Fu, J., Zhang, X. and Zhu, W. (2017), "Simulating progressive failure in brittle jointed rock masses using a modified elasticbrittle model and the application", Eng. Fract. Mech., 178, 212-230. https://doi.org/10.1016/j.engfracmech.2017.04.037
  7. Haeri, H., Khaloo, A. and Marji, M.F. (2015), "Experimental and numerical simulation of the microcrack coalescence mechanism in rock-like materials", Strength Mater., 47(5), 740-754. https://doi.org/10.1007/s11223-015-9711-6
  8. Haeri, H., Shahriar, K. and Marji, M.F. (2014), "Experimental and numerical study of crack propagation and coalescence in precracked rock-like disks", Int. J. Rock Mech. Min. Sci., 67, 20-28. https://doi.org/10.1016/j.ijrmms.2014.01.008
  9. Huang, Y., Yang, S. and Tian, W. (2016), "An experimental study on fracture mechanical behavior of rock-like materials containing two unparallel fissures under uniaxial compression", Acta. Mech. Sinica, 32(3), 442-455. https://doi.org/10.1007/s10409-015-0489-3
  10. Jin, J., Cao, P. and Chen, Y. (2017), "Influence of single flaw on the failure process and energy mechanics of rock-like material", Comput. Geotech., 86, 150-162. https://doi.org/10.1016/j.compgeo.2017.01.011
  11. Komurlu, E., Kesimal, A. and Demir, S. (2016), "Experimental and numerical analyses on determination of indirect (splitting) tensile strength of cemented paste backfill materials under different loading apparatus", Geomech. Eng., 10(6), 775-791. https://doi.org/10.12989/gae.2016.10.6.775
  12. Kong, B., Li, Z., Wang, E., Lu, W., Chen, L. and Qi, G. (2018), "An experimental study for characterization the process of coal oxidation and spontaneous combustion by electromagnetic radiation technique", Proc. Safety Environ. Protect., 119, 285-294. https://doi.org/10.1016/j.psep.2018.08.002
  13. Lee, H. and Jeon, S. (2011), "An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression", Int. J. Solids Struct., 48(6), 979-999. https://doi.org/10.1016/j.ijsolstr.2010.12.001
  14. Li, H. and Wong, L. (2012), "Influence of flaw inclination angle and loading condition on crack initiation and propagation", Int. J. Solids Struct., 49(18), 2482-2499. https://doi.org/10.1016/j.ijsolstr.2012.05.012
  15. Li, H. and Wong, L. (2014), "Numerical study on coalescence of Pre-Existing flaw pairs in Rock-Like material", Rock Mech. Rock. Eng., 47(6), 2087-2105. https://doi.org/10.1007/s00603-013-0504-6
  16. Liu, Y., Dai, F. and Fan, P. (2017), "Experimental investigation of the influence of joint geometric configurations on the mechanical properties of intermittent jointed rock models under cyclic uniaxial compression", Rock Mech. Rock. Eng., 50(6), 1453-1471. https://doi.org/10.1007/s00603-017-1190-6
  17. Lu, Y., Wang, L. and Elsworth, D. (2015), "Uniaxial strength and failure in sandstone containing a pre-existing 3-D surface flaw", Int. J. Fracture, 194(1), 59-79. https://doi.org/10.1007/s10704-015-0032-3
  18. Panaghi, K., Golshani, A. and Takemura, T. (2015), "Rock failure assessment based on crack density and anisotropy index variations during triaxial loading tests", Geomech. Eng., 9(6), 793-813. https://doi.org/10.12989/gae.2015.9.6.793
  19. Sarfarazi, V., Haeri, H., Marji, M.F. and Zhu, Z.M. (2017), "Fracture mechanism of brazilian discs with multiple parallel notches using PFC2D", Polytech. Civ. Eng., 61(4), 653-663.
  20. Shen, B. and Barton, N. (2018), "Rock fracturing mechanisms around underground openings", Geomech. Eng., 16(1), 35-47. https://doi.org/10.12989/gae.2018.16.1.035
  21. Sun, X.Z., Shen, B. and Zhang, B.L. (2018), "Experimental study on propagation behavior of three-dimensional cracks influenced by intermediate principal stress", Geomech. Eng., 14(2), 195-202. https://doi.org/10.12989/GAE.2018.14.2.195
  22. Wang, G., Wu, M., Wang, R., Xu, H. and Song, X. (2017), "Height of the mining-induced fractured zone above a coal face", Eng. Geol., 216, 140-152. https://doi.org/10.1016/j.enggeo.2016.11.024
  23. Wang, S.Y., Sloan, S.W. and Sheng, D.C. (2014), "Numerical study of failure behaviour of pre-cracked rock specimens under conventional triaxial compression", Int. J. Solids Struct., 51(5), 1132-1148. https://doi.org/10.1016/j.ijsolstr.2013.12.012
  24. Wang, X. and Tian, L. (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
  25. Yang, L., Jiang, Y. and Li, S. (2013), "Experimental and numerical research on 3D crack growth in rocklike material subjected to uniaxial tension", J. Geotech. Geoenviron. Eng., 139(10), 1781-1788. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000917
  26. Yang, S., Jing, H. and Xu, T. (2014), "Mechanical behavior and failure analysis of brittle sandstone specimens containing combined flaws under uniaxial compression", J. Central South Univ., 21(5), 2059-2073. https://doi.org/10.1007/s11771-014-2155-5
  27. Yang, S., Tian, W. and Huang, Y. (2016), "An experimental and numerical study on cracking behavior of brittle sandstone containing two non-coplanar fissures under uniaxial compression", Rock Mech. Rock Eng., 49(4), 1497-1515. https://doi.org/10.1007/s00603-015-0838-3
  28. Zhang, X., Liu, Q. and Wu, S. (2015), "Crack coalescence between two non-parallel flaws in rock-like material under uniaxial compression", Eng. Geol., 199, 74-90. https://doi.org/10.1016/j.enggeo.2015.10.007
  29. Zhao, X.G., Cai, M. and Wang, J. (2015), "Objective determination of crack initiation stress of brittle rocks under compression using AE measurement", Rock Mech. Rock Eng., 48(6), 2473-2484. https://doi.org/10.1007/s00603-014-0703-9
  30. Zhou, X., Zhang, J. and Wong, L. (2018), "Experimental study on the growth, coalescence and wrapping behaviors of 3D crossembedded flaws under uniaxial compression", Rock Mech. Rock Eng., 51(5), 1379-1400. https://doi.org/10.1007/s00603-018-1406-4
  31. Zhou, X.P., Bi, J. and Qian, Q.H. (2015), "Numerical simulation of crack growth and coalescence in rock-like materials containing multiple pre-existing flaws", Rock Mech. Rock Eng., 48(3), 1097-1114. https://doi.org/10.1007/s00603-014-0627-4
  32. Zou, C., Wong, L.N.Y. and Loo, J.J. (2016), "Different mechanical and cracking behaviors of single-flawed brittle gypsum specimens under dynamic and quasi-static loadings", Eng. Geol., 201, 71-84. https://doi.org/10.1016/j.enggeo.2015.12.014

Cited by

  1. Stability Analysis of Slope with Multiple Sliding Surfaces Based on Dynamic Strength-Reduction DDA Method vol.2019, 2019, https://doi.org/10.1155/2019/2183732
  2. A Novel Experimental Technique to Simulate Shock Behaviour and Bursting Failure of Roadways vol.2019, 2019, https://doi.org/10.1155/2019/9395354
  3. Evolution Model of Seepage Characteristics in the Process of Water Inrush in Faults vol.2019, 2019, https://doi.org/10.1155/2019/4926768
  4. Interaction of Cleat-Matrix on Coal Permeability from Experimental Observations and Numerical Analysis vol.2019, 2019, https://doi.org/10.1155/2019/7474587
  5. Multi-field Coupling of Water Inrush Channel Formation in a Deep Mine with a Buried Fault vol.38, pp.3, 2019, https://doi.org/10.1007/s10230-019-00616-2
  6. Numerical Simulation Analysis of NPR Anchorage Monitoring of Bedding Rock Landslide in Open-Pit Mine vol.2020, 2019, https://doi.org/10.1155/2020/8241509
  7. Laboratory investigation of the mechanical properties of coal-rock combined body vol.79, pp.4, 2019, https://doi.org/10.1007/s10064-019-01613-z
  8. A rock physical approach to understand geo-mechanics of cracked porous media having three fluid phases vol.23, pp.4, 2019, https://doi.org/10.12989/gae.2020.23.4.327
  9. Optimal design of shape of a working in cracked rock mass vol.24, pp.3, 2021, https://doi.org/10.12989/gae.2021.24.3.227
  10. Numerical simulation on the crack initiation and propagation of coal with combined defects vol.79, pp.2, 2019, https://doi.org/10.12989/sem.2021.79.2.237