通过数字散斑技术（digital image correlation, DIC）研究了不同加载速率下煤体表面应变场演化特征，分析了加载速率对表面变形场演化过程、变形局部化特征及表面变形能密度的影响规律。研究结果表明：加载速率越高，煤体最终破坏形态越充分，煤体破坏模式也由剪切破坏过度为张性破坏；不同量级的加载速率影响了煤体的变形局部化时刻，加载速率越高，煤体变形局部化启动时间所占整体破坏时间的比重越大；加载速率越高，变形局部化前变形能密度增长趋势越明显，表面变形局部化区域能量积聚越多，变形局部化启动时刻应力越大。

The digital image correlation (DIC) technology was used to investigate the evolution law of the coal surface strain field under different loading rates and to analyze the influence of loading rate on the evolution of the deformation field, deformation localization, and surface deformation energy density. The experimental results indicate that the higher the loading rate is, the more complete the final failure mode of the coal body, and the failure mode of the coal body also transitions from shear failure to tensile failure; the loading rates of different magnitudes also affect the localization time of coal deformation. The higher the loading rate is, the greater the proportion of the initiation time of coal deformation localization to the overall failure time. The higher the loading rate is, the more obvious the growth trend of deformation energy density before deformation localization, and the more energy accumulates in the surface deformation localization area; the qreater the stress at the start time of deformation localization.