大理岩单轴循环加卸载碎屑分形研究

为了研究单轴不同循环加卸载路径对岩石破坏模式和程度的影响,对大理岩单轴循环加卸载的峰值强度、弹性模量进行研究;收集大理岩单轴循环加卸载破坏后的碎屑,对不同粒径范围内的碎屑进行分析和分形计算。研究结果表明,受循环加卸载后的碎屑条状、条块状特征明显,并且条状、块状、板状特征依次减弱;碎屑在长、宽、厚3个方向上分形维数越小,岩石越易破碎,破坏程度越大;岩石受循环加卸载的破坏模式以纵向劈裂为主,少有剪切破坏;循环荷载在一定程度上对大理岩的强度起到一定的强化作用,施加小的循环荷载对大理岩的强度强化作用显著使其破坏程度减小;施加大的循环荷载对大理岩的强度强化作用大大减弱,造成的损伤作用更为显著使其破坏程度更大。

Marble under Uniaxial Cyclic Loading and Unloading Clastic Fractal Research

In order to study the influence of uniaxial cyclic loading and unloading paths on rock failure modes and extent, the peak strength and modulus of elasticity of single shaft cyclic loading and unloading are studied; collection of marble under uniaxial cyclic loading and unloading destructive debris, and debris of different sizes within the scope of the analysis and calculation of fractal. The results show that the debris after cyclic loading and unloading is characterized by strip shape and strip shape, and the strip, block and plate characteristics are weakened; The smaller the fractal dimension is in the three directions of the length, width and thickness, the more easily broken rock, the greater the degree of damage; The failure modes of cyclic loading and unloading of rock are mainly longitudinal splitting, and there are few shear failure; Cyclic loading in a certain extent of rock strength to strengthen effect, strengthen the effect of cyclic loading was applied to small marble strength significantly increased the extent of damage is reduced; the strengthening effect of cyclic loading was applied on the marble strength greatly weakened, damage caused by the more significant the damage greater.