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对大理岩试样进行恒轴压条件下峰前、峰后卸围压破坏试验,研究岩石的变形破坏特征及破坏过程能量演化规律,得到以下结论:恒轴压条件下环向变形随卸荷速率增大而减小,而轴向变形变化很小,轴向变形没有明显的速率变化效应;峰前、峰后卸荷都为典型的剪切破坏,而峰后卸荷有明显的共轭剪切带;卸荷破坏过程能量转化大致分为能量积聚、能量耗散和能量释放3个阶段;卸荷速率越快,弹性应变能释放得越快、越剧烈;耗散能变化率随卸荷速率的增加也变大;耗散能变化率比弹性应变能变化率大一个数量级,能量快速耗散是大理岩卸荷破坏过程的主要特征。
The marble specimens were subjected to uniaxial and unloading confining pressure tests under constant axial pressure. The deformation and failure characteristics of rock and energy evolution during failure process were studied. The following conclusions were obtained: But the axial deformation is small and the axial deformation has no obvious rate change effect. The unloading before and after the peak is a typical shear failure, while the unloading after the peak has obvious conjugation Shear band. During the process of unloading failure, the energy conversion can be divided into three stages: energy accumulation, energy dissipation and energy release. The faster the unloading rate, the faster the elastic strain energy is released and the more severe the energy dissipation rate is. The increase of the charge rate also increases. The rate of change of dissipation energy is one order of magnitude larger than the rate of change of elastic strain energy. The rapid dissipation of energy is the main feature of the unloading failure process of marble.