A pore crack model for the mechanical behaviour of porous granular rocks in the brittle deformation regime
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- 作者：Klein ; E. ; Reuschlé ; T.
- 关键词：Pore crack model ; Granular rocks ; Brittle regime
- 刊名：International Journal of Rock Mechanics and Mining Sciences
- 出版年：2004
- 出版时间：September, 2004
- 年：2004
- 卷：41
- 期：6
- 页码：975-986
- 全文大小：374 K
文摘
A model is developed for predicting and simulating the mechanical behaviour and failure mode of brittle porous granular rocks loaded in compression. It is based on a fracture mechanics analysis applied to cracks emanating from the surface of cylindrical pores in two-dimensional, which is well suited to the microstructure of such rocks. It is also consistent with the usual experimental procedure used for biaxial compression tests since the numerical scheme is implemented under the assumption of imposed axial strain. The model takes into account interactions between neighbouring cracks, which grow when their stress intensity factor reaches the fracture toughness of the rock. The simulation of crack growth from cylindrical holes, associated with a failure criterion based on the coalescence of interacting cracks, allows one to calculate the critical stress at rupture and to derive theoretical stress–strain curves.