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基于大理岩常规三轴加荷与卸荷试验结果,分析加卸荷应力路径下大理岩各阶段特征应力、黏聚力c、内摩擦角φ在变形破坏中的变化规律。试验结果表明,相同卸荷速率条件下,压密应力对应的环向应变、体积应变随围压的增大而减小,起裂应力及扩容应力随围压增大而增大,加卸荷应力路径下扩容应力对应的环向应变均稳定在(-0.000 4±0.000 1)范围内。大理岩卸荷破坏的初始屈服面和后继屈服面均符合Mogi-Coulomb函数形式,峰值强度前黏聚力c随塑性参数εps的增大而减小,内摩擦角φ随塑性参数εps的增大而增大。
Based on the results of conventional triaxial loading and unloading tests on marble, the variation regularities of the characteristic stress, cohesion c and internal friction angle φ of the marble during deformation and failure under different loading and unloading stress paths are analyzed. The experimental results show that under the same unloading rate, the circumferential strain and volumetric strain corresponding to compressive stress decrease with the increase of confining pressure, and the initiation stress and expanding stress increase with the increase of confining pressure, The hoop strain corresponding to the dilatancy stress in the stress path is all within the range of (-0.000 4 ± 0.000 1). The initial yield surface and subsequent yield surface of unloading damage of marble all fit the form of Mogi-Coulomb function. The peak cohesion c decreases with the increase of plastic parameter εps. The internal friction angle φ increases with the increase of plastic parameter εps Increase.