Yielding in intact rock at different scales
Investigation of mechanical behavior in intact rock can help to better understand the stress-strain correlation in accordance with yielding. Attention to the formulation of yield criteria can direct the research into two areas, developing the criteria based on interpolation of experimental data and detailed study of micromechanics. The aim in the mathematical theory of yielding is to describe the theoretical respects in relation to stress and strain and recognition of the limit between elastic and plastic behavior. The authors consider studying of yielding in intact rock at different scales. From Weibull theory it is believed that the increase in scale causes a decrease in the strength. This has been quantified by the Hoek-Brown equation for Uniaxial Compressive Strength (UCS). However, the confinement can change this strength and subsequently yielding. Thus, from experimental observations the change of yielding at different scales is investigated. The experiments are conducted on cylindrical samples of sandstone with diameters of 50 and 96 mm. Every specimen was tested at different confining pressures. The distinctions of the initial yield points at different scales are extracted and the yield surfaces are depicted. Finally a simple mathematical yield criterion is developed.
Hossein Masoumi Kurt J. Douglas S.M. Seyed Alizadeh
School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, Australia School of Petroleum Engineering, University of New South Wales, Sydney, NSW, Australia
国际会议
The Fifth International Symposium on In-situ Rock Stress(第五届国际岩石应力研讨会)
北京
英文
769-776
2010-08-25（万方平台首次上网日期，不代表论文的发表时间）