English
Język Polski
Analysis of uniaxial compression of rock mass with parallel cracks based on experimental study and PFC2D numerical simulation
DOI:
https://doi.org/10.24425/ace.2022.140159Abstract
In this study, the uniaxial compression test and the numerical simulation of the two-dimensional particle flow code (PFC2D) were used to study the mechanical properties and failure laws of rock masses with parallel cracks. The experiment considers the influences of crack length (l), crack angle (β1L β2), and numerical changes in the rock bridge length (ℎ) and bridge angle (α) on failures of rock-like specimens. The results indicate that the uniaxial compressive strength (UCS) of the rock-like specimens with parallel cracks decreases with increasing l under different α values. The smaller angle between the preset crack and the loadinging direction (β) resulting in higher UCS. In addition, a larger ℎ results in higher UCS in the specimen. When β1 or β2 is fixed, the UCS and elastic modulus of the specimen show an ‘M’ shape with an increase in α. Moreover, the crack growth or failure mode of samples with different l values is similar. When β1 or β2 is small, the failure of the specimen is affected by the development and expansion of wing cracks. If one of β1 and β2 is large, the failure of the specimen is dominated by the expansion and development of the secondary cracks which is generated at the tip of the prefabricated crack. Furthermore, when the angle between the prefabricated crack and the loading direction is β1 = 0º, the rock bridge is less likely to reach penetration failure as ℎ increases. Secondary crack connections between the prefabricated cracks occur only when α is small.References
[1] Y. Yuan, J. Fu, X. Wang, X. Shang, “Experimental Study on Mechanical Properties of Prefabricated Single-Cracked Red Sandstone under Uniaxial Compression”, Advances in Civil Engineering, 2020, vol. 2020, DOI: 10.1155/2020/8845368.
[2] J.H. Wen, T. Zhan, D. Ashley P., T. Ali, “The mechanical behaviour of pre-existing transverse cracks in lignite under uniaxial compression”, Geomechanics and Geophysics Geo-Energy and Geo-Resources, 2021, vol. 7, DOI: 10.1007/s40948-020-00201-w.
[3] J.M. Zhu, H.L. Yu, “Analysis of Crack Propagation Characteristics of Rock-like Material with Double Closed Cracks Under Uniaxial Compression”, Geotechnical and Geological Engineering, 2020, vol. 38, pp. 6499-6509, DOI: 10.1007/s10706-020-01451-x.
[4] L.X. Xiong, H.J. Chen, D.X. Geng, “Uniaxial Compression Study on Mechanical Properties of Artificial Rock Specimens with Cross-Flaws”, Geotechnical and Geological Engineering, 2021, vol. 39, pp. 1667-1681, DOI: 10.1007/s10706-020-01584-z.
[5] W. Han, Y.J. Jiang, H.J. Luan, J.K. Liu, X.L. Wu, Y.T. Du, “Fracture evolution and failure mechanism of rock-like materials containing cross-flaws under the shearing effect”, Theoretical and Applied Fracture Mechanics, 2020, vol. 110, DOI: 10.1016/j.tafmec.2020.102815.
[6] Y.S. Zhao, Y.T. Gao, S.C. Wu, “Experimental and Numerical Studies of Brittle Rock-Like Samples with Internal Open Fractures and Cavities Under Uniaxial Compression”, Arabian Journal for Science and Engineering, 2020, vol. 45, pp. 8349-8368, DOI: 10.1007/s13369-020-04712-2.
[7] P. Feng, F. Dai, Y. Liu, N. Xu, T. Zhao, “Influence of two unparallel cracks on the mechanical behaviours of rock-like specimens subjected to uniaxial compression”, European Journal of Environmental and Civil Engineering, 2020, vol. 24, pp.1643-1663, DOI: 10.1080/19648189.2018.1481770.
[8] L.O. Afolagboye, J. He, S.Wang, “Experimental study on cracking behaviour of moulded gypsum containing two non-parallel overlapping flaws under uniaxial compression”, Acta Mechanica Sinica, 2017, vol. 33, pp. 394-405, DOI: 10.1007/s10409-016-0624-9.
[9] T.N. Dey, C.Y. Wang, “Some mechanisms of microcrack growth and interaction in compressive rock failure”, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1981, vol. 18, pp. 199-209, DOI: 10.1016/0148-9062(81)90974-8.
[10] C.H. Park, A. Bobet, “Crack initiation, propagation and coalescence from frictional flaws in uniaxial compression”, Engineering Fracture Mechanics, 2010, vol. 77, pp. 2727-2748, DOI: 10.1016/j.engfracmech.2010.06.027.
[11] S.J. Chen, Z.G. Xia, F. Feng, D.W. Yin, “Numerical study on strength and failure characteristics of rock samples with different hole defects”, Bulletin of Engineering Geology and the Environment, 2021, vol. 80, pp. 1523-1540, DOI: 10.1007/s10064-020-01964-y.
[12] J.Y. Shen, S.X. Zhan, M. Karakus, J.P. Zuo, “Effects of flaw width on cracking behavior of single-flawed rock specimens”, Bulletin of Engineering Geology and the Environment, 2021, vol. 80, pp. 1701-1711, DOI: 10.1007/s10064-020-02029-w.
[13] A. Fakhimi, T. Villegas, “Application of Dimensional Analysis in Calibration of a Discrete Element Model for Rock Deformation and Fracture”, Rock Mechanics and Rock Engineering, 2007, vol. 40, pp. 193-211, DOI: 10.1007/s00603-006-0095-6.
[14] W. Zeng, S.Q. Yang, W.L. Tian, “Experimental and numerical investigation of brittle sandstone specimens containing different shapes of holes under uniaxial compression”, Engineering Fracture Mechanics, 2018, vol. 200, pp. 430-450, DOI: 10.1016/j.engfracmech.2018.08.016.
[15] T. Wu, Y. Gao, Y. Zhou, J. Li, “Experimental and numerical study on the interaction between holes and cracks in rock-like materials under uniaxial compression”, Theoretical and Applied Fracture Mechanics, 2020, vol. 106, DOI: 10.1016/j.tafmec.2020.102488.
[16] H. Haeri, V. Sarfarazi, Z.M. Zhu, H.R. Nejati, “Numerical simulations of fracture shear test in anisotropy rocks with bedding layers”, Advances in Concrete Construction, 2019, vol. 7, no. 4, pp. 241-247, DOI: 10.12989/acc.2019.7.4.241.
[17] T.B. Zhao, W.Y. Guo, Y.L. Tan, F.H. Yu, B. Huang, L.S. Zhang, “Failure mechanism of layer-crack rock models with different vertical crack geometric configurations under uniaxial compression”, Advances in Mechanical Engineering, vol. 9, no. 11, DOI: 10.1177/1687814017737259.
[18] M. Bahaaddini, G. Sharrock, B.K. Hebblewhite, “Numerical investigation of the effect of joint geometrical parameters on the mechanical properties of a non-persistent jointed rock mass under uniaxial compression”, Computers and Geotechnics, 2013, vol. 49, pp. 206-225, DOI: 10.1016/j.compgeo.2012.10.012.
[19] Z.C. Wang, W.T. Zhao, K. Pan, “Analysis of fracture evolution characteristics of coplanar double fracture rock under uniaxial compression”, Geotechnical and Geological Engineering, 2020, vol. 38, pp. 343-352, DOI: 10.1007/s10706-019-01022-9.
[20] Y.H. Huang, S.Q. Yang, W.L. Tian, “Cracking process of a granite specimen that contains multiple preexisting holes under uniaxial compression”, Fatigue and Fracture of Engineering Materials and Structures, 2019, vol. 42, pp. 1341-1356, DOI: 10.1111/ffe.12990.
[21] M. Sagong, A. Bobet, “Coalescence of multiple flaws in a rock-model material in uniaxial compression”, International Journal of Rock Mechanics and Mining Sciences, 2002, vol. 39, no. 2, pp. 229-241, DOI: 10.1016/S1365-1609(02)00027-8.
[22] C. Zhao, J.L. Niu, Q.Z. Zhang, C.F. Zhao, Y.M. Zhou, “Failure characteristics of rock-like materials with single flaws under uniaxial compression”, Bulletin of Engineering Geology and the Environment, 2019, vol. 78, pp. 593-603, DOI: 10.1007/s10064-018-1379-2.
Downloads
Published
How to Cite
Issue
Section
