岩石变形破坏全过程的变形场和能量演化研究

以白光数字散斑相关方法作为试验观测手段，通过单轴压缩试验对一种红砂岩变形破坏全过程的变形场和能量演化特征进行研究。利用CCD(charge-coupled device)相机记录试验加载全过程的试件表面散斑场图像，采用数字散斑相关方法对试验图像进行分析，计算得到了岩石变形破坏过程中试件表面变形场、变形局部化区域的位移错动量值和试件表面变形能密度量值，并对变形局部化带的位移演化和变形能量演化特征进行分析。从试验结果分析得出：岩石试件变形局部化带的位移演化在加载峰值前基本上保持线性演化规律，而其位移错动加速与加载峰值点相对应，岩石试件加载峰值后阶段的承载力变化主要受变形局部化带的位移演化影响；岩石试件在加载过程中的能量释放和能量积累规律与局部化带的演化有关，体现出局部能量释放和整体能量释放两种形式。

Evolution of deformation fields and energy in whole process of rock failure

The energy evolution characteristics on the whole process of deformation and damage of rock is inspected and analyzed by using the digital speckle correlation method.The specimen surface speckles images are recorded by CCD camera.The deformation evolution process,the displacement evolution of deformation localization region and the surface deformation energy of rock loaded are analyzed.The results show that: for the displacement evolution of deformation band,the displacement evolution is basically linear before the loading peak,the loading peak of rock specimen and the accelerating stage of displacement evolution is corresponding.Displacement evolution of deformation localization band influences the bearing capacity of rock specimens after loading peak.For the surface energy evolution of rock specimen,the energy release and energy accumulation pattern are controlled by the deformation evolution of localization band in the process of loading.The energy evolution reflects the local energy release and overall energy release characteristics.