Abstract：Based on the meso-structure， the present paper employs the augmented virtual internal bond(AVIB) to model rock，thereafter to simulate fracture propagation in rock. The AVIB is a constitutive model that was developed based on the theory of virtual internal bond(VIB). It uses the Xu-Needleman potential function to describe the micro bond，which is very suitable for modeling the cohesive properties of mineral grain interface. For the constitutive model implicitly contains the micro bond rupture mechanism，it doesn?t need separate fracture criterion when simulating fracture propagation and coalescence. Moreover，by AVIB，the complex 3D fracture behaviors can trace back to the 1D micro bond rupture process. These features of AVIB make it powerful in analysis of rock failure. The purpose of the paper is to provide a new theory for multiscale modeling and fracture simulation method for rock.
张振南，葛修润. 一种新的岩石多尺度本构模型：增强虚内键模型及其应用[J]. 岩石力学与工程学报, 2012, 31(10): 2037-2041.
ZHANG Zhennan，GE Xiurun. A NEW MULTISCALE CONSTITUTIVE MODEL FOR ROCK：AUGMENTED VIRTUAL INTERNAL BOND MODEL AND ITS APPLICATION. , 2012, 31(10): 2037-2041.
[1] GAO H J，KLEIN P. Numerical simulation of crack growth in an isotropic solid with randomized internal cohesive bond[J]. Journal of the Mechanics and Physics of Solids，1998，46(2)：187–218.
[2] ZHANG Z N，GE X R. A new quasi-continuum constitutive model for crack growth in an isotropic solid[J]. European Journal of Mechanics- A/Solids，2005，24(2)：243–252.
[3] ZHANG Z N，GE X R. Micromechanical consideration of tensile crack behavior based on virtual internal bond in contrast to cohesive stress[J]. Theoretical and Applied Fracture Mechanics，2005，43(3)：342–359.
[4] ZHANG Z N，GE X R. Micromechanical modelling of elastic continuum with virtual multi-dimensional internal bonds[J]. International Journal for Numerical Methods in Engineering，2006，65(2)：135–146.
[5] VOLOKH K Y，GAO H. On the modified virtual internal bond method[J]. Journal of Applied Mechanics，2005，72(6)：969–971.
[6] ZHANG Z N，GAO H J. Simulating fracture propagation in rock and concrete by an augmented virtual internal bond method[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2012，36(4)：459–482.
[7] XU X P，NEEDLEMAN A. Numerical simulations of fast crack growth in brittle solids[J]. Journal of Mechanics and Physics of Solids，1994，42(9)：1 397–1 434.
[8] YANG S Q，YANG D S，JING H W，et al. An experimental study of the fracture coalescence behaviour of brittle sandstone specimens containing three fissures[J]. Rock Mechanics and Rock Engineering，2012，45(4)：563–582.
[9] ZHAO G F，FANG J，SUN L，et al. Parallelization of the distinct lattice spring model[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2011，doi：10.1002/nag.1085.
[10] ZHAO G F，FANG J，ZHAO J. A 3D distinct lattice spring model for elasticity and dynamic failure[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2011，35(8)：859–885.
[11] ZHANG Z N. Multiscale simulation of fracture propagation in heterogeneous materials using virtual multidimensional internal bonds[J]. Theoretical and Applied Fracture Mechanics，2008，49(3)：233–241.
2012, Vol. 31 
