中文摘要：

利用煤试件单轴压缩加载试验，进行了煤柱失稳破坏的变形场及能量演化特征研究。结合数字散斑相关方法对煤柱试样变形破坏全过程的监测结果，分析了煤柱变形局部化产生、演化及煤柱失稳的各个阶段特征，进而分析计算得到煤柱失稳过程的能量演化。研究结果认为：从变形场角度可将煤柱失稳机理分为煤柱内部裂隙失稳扩展和煤柱内部弱面失稳滑动2种类型。煤柱在受载过程中的能量释放和能量积聚规律与其最终的失稳模式相关，相对而言，煤柱内部弱面失稳滑动破坏的能量释放率较小，煤柱内部裂纹失稳扩展破坏的能量释放率较大。

英文摘要：

In this paper, based on the uniaxial compression test of coal samples, the evolution charac- teristics of deformation and energy fields during coal pillar instability process were studied. Meanwhile, the specimen surface speckles images were recorded by CCD camera. Combined with the monitoring results of coal samples＇ whole deformation and failure process by using the digital speckle correlation method, the generation and evolution of deformation localization in coal pillar, as well as the characteristics of coal pillar instability in each stage were systematically analyzed. Then, the energy evolution during coal pillar instability process was calculated. The results show that the coal pillar in- stability can be divided into two types： unstable propagation of fracture inner coal piller and unstable sliding of weak plane inner coal piUer. The energy release and accumulation patterns during loading process of coal pillar are mainly controlled by the final instability modes. Comparatively speaking, the energy release rate during the weak plane unstable sliding inner coal piller is relatively small, while the energy release rate during the fracture unstable propagation is larger.