. Huang, D., Gu, D. and Yang, C. (2016). Investigation on Mechanical Behaviors of Sandstone with Two Pre-existing Flaws under Triaxial Compression. Rock Mech Rock Eng. 49: 375–399.
. Tian, J., Xu, D. and Liu, T. (2020). An experimental investigation of the fracturing behavior of rock-like materials containing two V-shaped parallelogram aws. International Journal of Mining Science and Technology. (06): 777-783.
. Ke, C.C, Chen, C.S., and Tu, C.H. (2008). Determination of fracture toughness of anisotropic rocks by boundary element method. Rock Mech. Rock. Engin. 41: 509–538.
. Yang, S.Q. (2011). Crack coalescence behavior of brittle sandstone samples containing two coplanar assures in the process of deformation failure. Engineering Fracture Mechanics. 78 (17): 3059-3081.
. Shen, W., Yan, R.J., Barltrop, N., and Song, M. (2016). Fatigue crack growth analysis of T junction under biaxial compressive-compressive loading. Engineering Fracture Mechanics. 154: 207–224.
. Bobet, A. and Einstein, H.H. (1998a). Fracture coalescence in rock-type materials under uniaxial and biaxial compressions. Int. J. Rock Mech Min, Sci. 35:863–888.
. Bobet, A. and Einstein, H.H. (1998b). Numerical modeling of fracture coalescence in a model rock material. Int. J. Fracture 92:221–252.
. Pu, C.Z. and Cao, P. (2012). Failure characteristics and its influencing factors of rock-like material with multi-fissures under uniaxial compression. Transactions of Non-ferrous Metals Society of China. 22 (1): 185-191.
. Wong, L.N.Y. and Einstein, H.H. (2009). Systematic evaluation of cracking behavior in specimens containing single aws under uniaxial compression. Int J Rock Mech Min Sci. 46 (2): 239–249.
. Lee, S. and Ravichandran, G. (2003). Crack initiation in brittle solids under multi-axial compression. Engin. Fract. Mech. 70:1645–1658.
. Li, Y.P., Chen, L.Z., and Wang, Y.H. (2005). Experimental research on pre-cracked marble under compression. Int. J. Solids and Structures 42: 2505–2516.
. Yang, Q., Dai, Y.H., Han, L.J., and Jin, Z.Q. (2009). Experimental study on mechanical behavior of brittle marble samples containing different flaws under uniaxial compression. Engin. Fract. Mech. 76:1833-1845S.
. Park, C.H. and Bobet, A. (2010). Crack initiation, propagation and coalescence from frictional flaws in uniaxial compression. Engin Fract Mech 77: 2727–2748.
. Zhao, Y., Zhang, L., and Wang, W. (2016). Cracking and Stress–Strain Behavior of Rock-Like Material Containing Two Flaws under Uniaxial Compression. Rock Mech Rock Eng. 49: 2665–2687.
. Yang, S.Q. (2011). Crack coalescence behavior of brittle sandstone samples containing two coplanar fissures in the process of deformation failure. Engin. Fract. Mech. 78:3059-3081.
. Lee, H. and Jeon, S. (2011). An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression. Int. J. of Solids and Structures 48:979-999.
. Wei, C., Li, Y., Zhu, W., Li, S., Wang, S., and Wang, H., (2020). Experimental observation and numerical investigation on propagation and coalescence process of multiple flaws in rock-like materials subjected to hydraulic pressure and far-field stress. Theoretical and Applied Fracture Mechanics, https://doi.org/10.1016/j.tafmec.2020.102603
. Reis, J.M.L. and Nunes, L.C.S. (2014). Experimental investigation of mixed-mode-I/II fracture in polymer mortars using digital image correlation method. Latin American journal of solids and structures. 11: 330–343.
. Tang, C.A., Lin, P., Wong, R.H.C., and Chau, K.T. (2001). Analysis of crack coalescence in rock-like materials containing three flaws—Part II: Numerical approach. Int. J. Rock Mech. Min. Sci. 38: 925–939.
. Iturrioz, I., Miguel, L.F.F, and Riera, J. D. (2009). Dynamic fracture analysis of concrete or rock plates by means of the Discrete Element Method. Latin American journal of solids and structures 6:229–245.
. Marji, M.F., Hosseinin_Nasab, H, and Kohsary, A.H. (2006). On the uses of special crack tip elements in numerical rock fracture mechanics. Int. j. Solids and Structures 43: 1669-1692.
. Marji, M.F., Hosseini-nasab, H., and Hossein morshedy, A. (2009). Numerical modeling of the mechanism of crack propagation in rocks under TBM disc cutters. J. Mech. Mater. Struct. 2: 439-457.
. Marji, M.F. (2013). On the Use of Power Series Solution Method in the Crack Analysis of Brittle Materials by Indirect Boundary Element Method. Engin Fract Mech 98: 365–382.
. Haeri, H., Shahriar, K., Marji, M.F., and Moaref Vand, P. (2014). On the HDD analysis of micro cracks initiation, propagation and coalescence in brittle substances. Arab. J. geosc. doi:10.1007/s12517-014-1290-5.
. Haeri, H. (2015). Propagation Mechanism of Neighboring Cracks in Rock-like Cylindrical Specimens under Uniaxial Compression, Journal of Mining Science, No. 3.
. Zhang, L. and Zhu, J. (2020). Analysis of Mechanical Strength and Failure Morphology of Prefabricated Closed Cracked Rock Mass under Uniaxial Compression. Geotech Geol Eng. 38: 4905–4915.
. Hao, X.A., Yqa, B., Gang, W., Cheng, F.A., Mw, E. and Rui, W.F. (2020). Discrete element study on mesomechanical behavior of crack propagation in coal samples with two prefabricated ssures under biaxial compression. Powder Technology. 375: 42-59.
. Haeri, H., Sarfarazi, V., Zhu, Z., and Nejati, H.R. (2019). Numerical simulations of fracture shear test in anisotropy rocks with bedding layers. Advances in Concrete Construction: 7 (4): 241-247.
 Zhao W, Huang R, and Yan M (2015) Mechanical and fracture behavior of rock mass with parallel concentrated joints with different dip angle and number based on pfc simulation. Geomechanics and Engineering. 8 (6): 757-767.
 Li, H. and Wong, L. (2012). Influence of flaw inclination angle and loading condition on crack initiation and propagation. International Journal of Solids and Structures. 49 (18): 2482-2499.
 Hazzard, J.F., Young R.P., and Maxwell S.C. (2000) Micro-mechanical modeling of cracking and failure in brittle rocks Journal of Geophysical Research. 105 (B7): 16683-16697.
 Park, E.S. (2004) Simulation of the mechanical behavior of discontinuous rock masses using a bonded-particle model Proceedings from gulf rocks 2004, the 6th North America rock mechanics symposium (NARMS), American Rock Mechanics Association (ARMA) 55-60.
 Holt, R.M. and Kjølaas, J. (2005) Comparison between controlled laboratory experiments and discrete particle simulations of the mechanical behavior of rock International Journal of Rock Mechanics and Mining Sciences. 42 (7–8): 985-995.
 Yoon J. (2007) Application of experimental design and optimization to PFC model calibration in uniaxial compression simulation International Journal of Rock Mechanics and Mining Sciences. 44 (6): 871-889.
 Cho N. and Martin, C.D. (2007) A clumped particle model for rock International Journal of Rock Mechanics and Mining Sciences. 44 (7): 997-1010.