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岩石内存在裂隙等缺陷引起试样强度的离散。随着围压增加,裂隙的摩擦承载与黏结力差异减小,即初始损伤对高围压下强度影响较小。正则抛物线准则可以准确描述砂岩等颗粒性岩石在高围压下的强度,拟合参数视为岩石的理想单轴压缩强度,其与试验值的差异表征试样初始损伤度。该参数可以为岩石损伤力学分析提供基础。
Defects such as fissures in the rock cause the strength of the sample to be discrete. As the confining pressure increases, the difference between the friction bearing and the cohesive force of the crack decreases, that is, the initial damage has less influence on the strength under high confining pressure. The regular parabolic criterion can accurately describe the strength of granular rocks such as sandstone under high confining pressure. The fitted parameters are regarded as the ideal uniaxial compressive strength of rock. The difference with the test value indicates the initial damage degree of the specimen. This parameter can provide the basis for rock damage mechanics analysis.