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论文类型：期刊论文

发表时间：2015-04-01

发表刊物：MATERIALS RESEARCH INNOVATIONS

收录刊物：SCIE、EI、Scopus

卷号：19

页面范围：S237-S240

ISSN号：1432-8917

关键字：Tensile fracture; Numerical simulation; Pore pressure gradient; Rock; Damage evolution

摘要：When rock is subjected to internal hydraulic pressure and external mechanical loading, the fluid flow properties will be altered by newly induced fractures. In turn, the fluid flow driven by pore pressure gradient can influence the fracturing behaviour. To better capture the complex hydraulic fractures in rock materials, a 'pinch-off' breaking test is numerically conducted to illustrate the tensile failure of a rock specimen within a uniform pore pressure field. A double-notched specimen, with water pressure in one notch while keeping another one open to the atmosphere, is numerically extended to investigate how the water flow direction or the pore pressure gradient will influence the fracturing behaviour. The simulation results indicate that both pore pressure magnitude and the orientation and distribution of pore pressure gradient surrounding the fracture tip can affect fracturing process and macroscopic strength behaviour of rock materials.