一种新的岩石多尺度本构模型：增强虚内键模型及其应用

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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.

Key words： rock mechanics constitutive model augmented virtual internal bond(AVIB) model fracture meso- structure

Received: 11 April 2012

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http://www.rockmech.org/EN/Y2012/V31/I10/2037

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