![]() Munjiza A, John NWM (2002) Mesh size sensitivity of the combined FEM/DEM fracture and fragmentation algorithms. Munjiza A, Andrews KRF (1998) NBS contact detection algorithm for bodies of similar size. Morgans WTA, Terry NB (1958) Measurements of the static and dynamic elastic moduli of coal. Makarov PV, Smolin IY, Cherepanov OI, Trubitsyna NV, Voroshilov YS (2002) Elastic viscoplastic deformation and fracture of coal at the mesoscopic scale. Lu CP, Dou LM, Liu B, Xie YS, Liu HS (2012) Microseismic low-frequency precursor effect of bursting failure of coal and rock. Lisjak A, Grasselli G (2014) A review of discrete modeling techniques for fracturing processes in discontinuous rock masses. Liu J, Li C, Wang C, Zhang R, Zhang H (2011) Spectral characteristics of micro-seismic signals obtained during the rupture of coal. International Society for Rock Mechanics and Rock Engineering In: 13th ISRM international congress of rock mechanics. (2015) Granite burst under loading conditions and its characteristics of energy dissipation: implementation by fdem method and laboratory experiments. Lashkaripour GR (2002) Predicting mechanical properties of mudrock from index parameters. Kuruppu MD, Obara Y, Ayatollahi MR, Chong KP, Funatsu T (2014) ISRM-suggested method for determining the mode I static fracture toughness using semi-circular bend specimen. Kuna M (2013) Finite elements in fracture mechanics. Kou S, Ye D, Ding Y (1990) A constitutive model for structured coal based on fracture and damage mechanics. Int J Rock Mech Min Sci Geomech Abst 13:81–90 Ko HY, Gerstle KH (1976) Elastic properties of two coals. Klepaczko JR, Bassim MN, Hsu TR (1984) Fracture toughness of coal under quasi-static and impact loading. Jaeger JC, Cook NGW, Zimmerman R (2009) Fundamentals of rock mechanics. Hillerborg A, Modéer M, Petersson PE (1976) Analysis of crack formation and crack growth in concrete by means of fracture mechanics and finite elements. J Mech Phys Solids 8(2):100–104Įvans I, Pomeroy CD (1966) The strength, fracture and workability of coal. In: Proceedings of the international symposium on rock mechanicsĭugdale DS (1960) Yielding of steel sheets containing slits. Int J Rock Mech Min Sci Geomech Abst 13:45–51Ĭundall PA (1971) A computer model for simulating progressive, large-scale movement in blocky rock system. Eng fract mech 69(2):95–112īutkovich TR (1976) Correlations between measurements and calculations of high-explosive-induced fracture in a coal outcrop. J Geotech Geoenviron Eng 135(11):1547–1561īorst R de (2002) Fracture in quasi-brittle materials: a review of continuum damage-based approaches. J Inst Fuel 32(222):320–327īobet A, Fakhimi A, Johnson S, Morris J, Tonon F, Yeung MR (2009) Numerical models in discontinuous media: review of advances for rock mechanics applications. USA: CRC Pressīerenbaum R, Brodie I (1959) The tensile strength of coal. J Appl Math Mech 23:622–636īazant ZP, Planas J (1997) Fracture and size effect in concrete and other quasibrittle materials. General ideas and hydrotheses: axially-symmetric cracks. This study demonstrates that the CZM and CDM technique can be utilized together to obtain powerful insights into the failure mechanism of coal, which is also a powerful tool to clarify the collapse mechanism of coal block caving in the mining engineering design and scheme optimization.īarenblatt GI (1959) The formation of equilibrium cracks during brittle fracture. ![]() All the results of our simulation were fairly consistent with the one obtained from the tensile tests in the laboratory. ![]() Furthermore, the parallel computation in Abaqus was employed to accelerate the calculations. The nucleation, growth and propagation of cracks in the coal were described by the CZMs, while the potential contact detection and interaction of fractured solids were treated via the penalty method. These properties were carefully calibrated prior to being taken as input parameters for the CDM modeling. Specifically, uniaxial, Brazilian, and triaxial tests were conducted in the laboratory to obtain the mechanical and strength properties of the coal such as Young’s modulus, Poisson’s ratio, fracture energy, cohesive strength, friction angle, uniaxial compression and shear strength. We investigate the tensile failure processes of coal specimens under loading conditions by using both laboratory experiments and the 3D cohesive zone model (CZM) combined with the continuous-discontinuous method (CDM). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |