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对完整岩石力学机制的研究有助于更好地理解与屈服有关的应力-应变关系。屈服准则研究方法包括基于实验数据分析和基于微观力学的研究。屈服数学理论的研究目标是对应力和应变关系的理论描述和对弹塑性界限的识别。本文主要研究完整岩石在不同尺度上的屈服。从Weibull理论可知,岩石强度随尺度增大而减少,这已经通过单轴压缩强度(UCS)的Hoek-Brown方程得到证实。然而,围压能改变岩石强度及屈服。因此,本文利用直径为50mm和96mm的圆柱形砂岩样品在不同围压作用下的压缩实验来研究不同尺度下的岩石屈服,从实验中提取不同尺度下的屈服初始点并描述屈服面,最终给出简单数学形式的屈服准则。
The study of complete rock mechanics helps to better understand the stress-strain relationship associated with yielding. Yield criterion research methods include experimental data analysis and micromechanics-based research. The research objective of yield mathematical theory is to describe the relationship between stress and strain and to identify the elastic-plastic boundary. This paper mainly studies the yield of intact rocks on different scales. From the Weibull theory, rock strength decreases with increasing scale, as evidenced by the Hoek-Brown equation for uniaxial compressive strength (UCS). However, confining pressure can change rock strength and yield. Therefore, in this paper, the compressive experiments of cylindrical sandstone samples with diameters of 50mm and 96mm under different confining pressures are used to study the rock yield under different scales. The initial yield points at different scales are extracted from the experiment and the yield surface is described. Finally, Yield rules in simple mathematical form.