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Indexed by:期刊论文

Date of Publication:2016-05-15

Journal:Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering

Included Journals:EI、PKU、ISTIC

Volume:35

Page Number:2710-2719

ISSN No.:10006915

Abstract:A maximum tensile strain criterion is proposed to study the crack growth of hydraulic fracturing, which incorporates the effect of T-stress on crack growth. The critical water pressure and crack initiation angle at the onset of crack growth are studied. Furthermore, the effects of crack inclination angle, confining pressure, fracture process zone, T-stress and Poisson's ratio on the critical water pressure and crack initiation angle are also analyzed. The results show that the critical water pressure increases while crack initiation angle decreases with the increase of confining pressure, the radius of fracture process zone and Poisson's ratio. T-stress has little effect on propagation of fracture driven by water pressure. However, it is significantly effect on the propagation of crack driven by external loading. The theoretical results well agree with experimental data, which indicates the importance of considering the T-stress in the crack initiation criterion. ? 2016, Science Press. All right reserved.