DOI QR코드

DOI QR Code

Study of tensile behavior of Y shape non-persistent joint using experimental test and numerical simulation

  • Sarfarazi, V. (Department of Mining Engineering, Hamedan University of Technology) ;
  • Hajiloo, M. (Department of Mining Engineering, Hamedan University of Technology) ;
  • Ghalam, E. Zarrin (Department of Mining Engineering, Hamedan University of Technology) ;
  • Ebneabbasi, P. (Department of Civil Engineering, Azad University)
  • 투고 : 2020.10.29
  • 심사 : 2020.12.06
  • 발행 : 2020.12.25

초록

Experimental and discrete element methods were used to investigate the effects of angle of Y shape non-persistent joint on the tensile behaviour of joint's bridge area under brazilian test. concrete samples with diameter of 100 mm and thikness of 40 mm were prepared. Within the specimen, two Y shape non-persistent notches were provided. The large notch lengths were 6 cm, 4 cm and 2 cm. the small notch lengths were 3 cm, 2 cm and 1 cm. The angle of larger notch related to horizontal axis was 0°, 30°, 60°, 90°. Totally, 12 different configuration systems were prepared for Y shape non-persistent joints. Also, 18 models with different Y shape non-persistent notch angle and notch length were prepared in numerical model. The large notch lengths were 6 cm, 4 cm and 2 cm. the small notch lengths were 3 cm, 2 cm and 1 cm. The angle of larger notch related to horizontal axis was 0, 30, 60, 90, 120 and 150. Tensile strength of model materil was 1 MPa. The axial load was applied to the model by rate of 0.02 mm/sec. This testing showed that the failure process was mostly governed by the Y shape non-persistent joint angle and joint length. The tensile strengths of the specimens were related to the fracture pattern and failure mechanism of the discontinuities. It was shown that the tensile behaviour of discontinuities is related to the number of the induced tensile cracks which are increased by increasing the joint length and joint angle. The minimum tensile strength occurs when the angle of larger joint related to horizontal axis was 60°. Also, the maximum compressive strength occurs when the angle of larger joint related to horizontal axis was 90°. The tensile strength was decreased by increasing the notch length. The failure pattern and failure strength are similar in both methods i.e. the experimental testing and the numerical simulation methods.

키워드

참고문헌

  1. Adiyaman, G., Birinci, A., O ner, E. and Yaylaci, M. (2016), "A receding contact problem between a functionally graded layer and two homogeneous quarter planes", Acta Mechanica, 227(3), https://doi.org/10.1007/s00707-016-1580-y.
  2. Afolagboye, L.O., He, J.M. and Wang, S.J. (2017), "Crack initiation and coalescence behavior of two non-parallel flaws", Geotech. Geol. Eng., 36, 105-133. https://doi.org/10.1007/s10706-017-0310-0.
  3. Asadizadeh, M. (2019), "Mechanical characterisation of jointed rock-like material with nonpersistent rough joints subjected to uniaxial compression", Eng. Geol., 260, 105224. https://doi.org/10.1016/j.enggeo.2019.105224.
  4. Bobet, A. and Einstein, H.H. (1998), "Fracture coalescence in rock-type materials under uniaxial and biaxial compression", Int. J. Rock Mech. Min., 35, 863-888. https://doi.org/10.1016/S0148-9062(98)00005-9.
  5. Brooks, Z., Ulm, F.J. and Einstein, H.H. (2013), "Environmental scanning electron microscopy (ESEM) and nano indentation investigation of the crack tip process zone in marble", Acta Geotech., 8, 223-245. https://doi.org/10.1007/s11440-013-0213-z.
  6. Cao, R., Yao, R., Meng, J., Lin, Q., Lin, H. and Li, S. (2020), "Failure mechanism of non-persistent jointed rock-like specimens under uniaxial loading: Laboratory testing", Int. J. Rock Mech. Min. Sci., 132, 10434. https://doi.org/10.1016/j.ijrmms.2020.104341.
  7. Ghazvinian, A., Sarfarazi, V., Schubert, W. and Blumel, M. (2012), "A study of the failure mechanism of planar non-persistent open joints using PFC2D", Rock Mech. Rock Eng., 45(5), 677-693. https://doi.org/10.1007/s00603-012-0233-2.
  8. Haeri, H. and Sarfarazi, V. (2016a), "The effect of micro pore on the characteristics of crack tip plastic zone in concrete", Comput. Concrete, 17(1), 107-112. http://dx.doi.org/10.12989/cac.2016.17.1.107.
  9. Haeri, H. and Sarfarazi, V. (2016b), "The effect of non-persistent joints on sliding direction of rock slopes", Comput. Concrete, 17(6), 723-737. https://doi.org/10.12989/cac.2016.17.6.723.
  10. Haeri, H. and Sarfarazi, V. (2016c), "The deformable multilaminate for predicting the elasto-plastic behavior of rocks", Comput. Concrete, 18, 201-214. http://dx.doi.org/10.12989/cac.2016.18.2.201.
  11. Haeri, H., Sarfarazi, V. and Lazemi, H.A. (2016d), "Experimental study of shear behavior of planar non-persistent joint", Comput. Concrete, 17(5), 639-653. https://doi.org/10.12989/cac.2016.17.5.639.
  12. Hu, J., Wen, G., Lin, Q., Cao, P. and Li, S. (2020), "Mechanical properties and crack evolution of double-layer composite rock-like specimens with two parallel fissures under uniaxial compression", Theo. Appl. Fract. Mech., 108, 102610. https://doi.org/10.1016/j.tafmec.2020.102610.
  13. Huang, Y.H., Yang, S.Q. and Zhao, J. (2016), "Three-dimensional numerical simulation on triaxial failure mechanical behavior of rock-like specimen containing two unparallel fissures", Rock Mech Rock Eng., 49, 1-19. https://doi.org/10.1007/s00603-016-1081-2.
  14. Lee, H. and Jeon, S. (2011), "An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression", Int. J. Solid. Struct., 48, 979-999. https://doi.org/10.1016/j.ijsolstr.2010.12.001.
  15. Lin, Q., Cao, P., Cao, R., Lin, H. and Meng, J. (2020), "Mechanical behavior around double circular openings in a jointed rock mass under uniaxial compressio", Arch. Civil Mech. Eng., 20(1), 19. https://doi.org/10.1007/s43452-020-00027-z.
  16. Lin, Q., Cao, P., Meng, J., Cao, R. and Zhao, Z. (2020), "Strength and failure characteristics of jointed rock mass with double circular holes under uniaxial compression: Insights from discrete element method modelling", Theo. Appl. Fract. Mech., 109, 102692. https://doi.org/10.1016/j.tafmec.2020.102692.
  17. Potyondy, D.O. amd Cundall, P.A. (2004), "A bonded-particle model for rock", Int. J. Rock Mech. Min. Sci., 41(8), 1329-1364. https://doi.org/10.1016/j.ijrmms.2004.09.011.
  18. Sarfarazi, V. and Haeri, H. (2016a), "Effect of number and configuration of bridges on shear properties of sliding surface", J. Min. Sci., 52(2), 245-257. https://doi.org/10.1134/S1062739116020370.
  19. Sarfarazi, V., Faridi, H.R., Haeri, H. and Schubert, W. (2016b), "A new approach for measurement of anisotropic tensile strength of concrete", Adv. Concrete Constr., 3(4), 269-284. http://dx.doi.org/10.12989/acc.2015.3.4.26.
  20. Sarfarazi, V., Ghazvinian, A., Schubert, W., Blumel, M. and Nejati, H.R. (2014), "Numerical simulation of the process of fracture of Echelon rock joints", Rock Mech. Rock Eng., 47(4), 1355-1371. https://doi.org/10.1007/s00603-013-0450-3.
  21. Sarfarazi, V., Haeri, H. and Khaloo, A. (2016c), "The effect of non-persistent joints on sliding direction of rock slopes", Comput. Concrete, 17(6), 723-737. https://doi.org/10.12989/cac.2016.17.6.723.
  22. Shen, J.J., Liu, W.T., Zhang, Q. and Xu, K. (2016), "Numerical simulation and mechanical experiment on failure behaviour of specimens containing pre-existing two flaws", J. Liaoning Tech. Univ. Nat. Sci., 35, 1397-1401. https://doi.org/10.11956/j.issn.1008-0562.2016.12.004.
  23. Wang, Y. (2016), "Numerical simulation of propagation and coalescence of flaws in rock materials under compressive loads using the extended non-ordinary state-based peridynamics", Eng. Fract. Mech., 163, 273-248. https://doi.org/10.1016/j.engfracmech.2016.06.013.
  24. Wong, L.N.Y. and Einstein, H.H. (2009a), "Crack coalescence in molded gypsum and Carrara marble: part 1-macroscopic observations and interpretation", Rock Mech. Rock Eng., 42, 475-511. https://doi.org/10.1007/s00603-008-0002-4.
  25. Wong, L.N.Y. and Einstein, H.H. (2009b), "Crack coalescence in molded gypsum and Carrara marble: part 2-macroscopic observations and interpretation", Rock Mech. Rock Eng., 42, 513-545. https://doi.org/10.1007/s00603-008-0003-3.
  26. Wong, R.H.C. and Chau, K.T. (1998), "Crack coalescence in a rock-like material containing tow cracks", Int. J. Rock Mech. Min., 35, 147-164. https://doi.org/10.1016/S0148-9062(97)00303-3.
  27. Yang, S.Q., Liu, X.R. and Jing, H.W. (2013), "Experimental investigation on fracture coalescence behavior of red sandstone containing two unparallel fissures under uniaxial compression", Int. J. Rock Mech. Min., 63, 82-92. https://doi.org/10.1016/j.ijrmms.2013.06.008.
  28. Yaylaci, M. and Avcar, M. (2020), "Finite element modeling of contact between an elastic layer and two elastic quarter planes", Comput. Concrete, 26(2), 107-114. https://doi.org/10.12989/cac.2020.26.2.107.
  29. Yaylaci, M. and Birinci, A. (2013), "The receding contact problem of two elastic layers supported by two elastic quarter planes", Struct. Eng. Mech., 48(2), 241-255. https://doi.org/10.12989/sem.2013.48.2.241.
  30. Yaylaci, M. and Birinci, A. (2015), "Analytical solution of a contact problem and comparison with the results from FEM", Struct. Eng. Mech., 54(4), 607-622. https://doi.org/10.12989/sem.2015.54.4.607.
  31. Yaylaci, M., O ner, E. and Birinci, A. (2014), "Comparison between analytical and ANSYS calculations for a receding contact problem", J. Eng. Mech., ASCE, 140(9), 4014070. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000781.
  32. Yaylaci, M., Terzi, C. and Avcar, M. (2019), "Numerical analysis of the receding contact problem of two bonded layers resting on an elastic half plane", Struct. Eng. Mech., 72(6), 775-783. https://doi.org/10.12989/sem.2019.72.6.000.
  33. Yaylaci, U.E., Yaylaci, M., Olmez, H. and Birinci, A. (2020), "Artificial neural network calculations for a receding contact problem", Comput. Concrete, 25(6), 551-563. https://doi.org/10.12989/cac.2020.25.6.00.
  34. Zhang, B., Li, S.C. and Yang, X.Y. (2015b), "Mechanical property of rock-like material with intersecting multiflaws under uniaxial compression", CJRME, 34, 1777-1785. https://doi.org/10.13722/j.cnki.jrme.2014.0876.
  35. Zhang, X.P., Liu, Q., Wu, S. and Tang, X. (2015a), "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.
  36. Zhou, X.P. (2016), "The 3D numerical simulation for the propagation process of multiple pre-existing flaws in rock-like materials subjected to biaxial compressive loads", Rock Mech. Rock Eng., 49(5), 1611-1627. https://doi.org/10.1007/s00603-015-0867-y.
  37. Zhou, X.P. (2015), "Numerical simulation of crack growth and coalescence in rock-like materials containing multiple preexisting flaws", Rock Mech. Rock Eng., 48(3), 1097-1114. https://doi.org/10.1007/s00603-014-0627-4.
  38. Zhou, X.P. (2016), "Numerical simulation of crack propagation and coalescence in pre-cracked rock-like Brazilian disks using the non-ordinary state-based peridynamics", Int. J. Rock Mech. Min. Sci., 89, 235-249. https://doi.org/10.1016/j.ijrmms.2016.09.010.
  39. Zhu, Z.D., Lin, H.X. and Sun, Y.L. (2016), "An experimental study of internal 3D crack propagation and coalescence in transparent rock", Rock Soil. Mech., 37, 913-921. https://doi.org/10.16285/j.rsm.2016.04.001.