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长期的地质运动与地质构造作用,使得岩石力学与工程系统复杂,岩体的变形、损伤、破坏和演化包含多种相互耦合的动力学过程。基于MTS试验得到的不同岩性岩石试件单轴压缩全应力-应变曲线,对轴向应力分量进行功率谱分析、最大Lyapunov指数计算和Kol-mogorov熵提取。其功率谱含有丰富频谱成分,具有连续、噪声背景和宽峰的特征,能量随频率增大而减小,遵循反幂律规律;最大Lyapunov指数大于零,属于典型的混沌系统;岩石强度随Kolmogorov熵的增大而提高;表征系统无序程度的Kolmogorov熵可以作为岩石试件弱面发育程度的衡量标准。
Long-term geological movement and geological tectonics make the rock mechanics and engineering system complicated. The deformation, damage, destruction and evolution of rock mass contain a variety of coupled dynamic processes. Based on the uniaxial compressive total stress-strain curves of rock samples with different lithologies obtained by MTS test, the axial stress components were analyzed by power spectrum, the maximum Lyapunov exponent and the Kol-mogorov entropy. Its power spectrum is rich in spectral components, with continuous, noisy background and broad peaks. The energy decreases with increasing frequency and follows the law of inverse power law. The maximum Lyapunov exponent is larger than zero and belongs to the typical chaotic system. The rock strength varies with Kolmogorov Entropy increases and Kolmogorov entropy that characterizes the degree of disorder of the system can be used as a measure of the degree of weakness of the rock specimen.