制备高度比为1∶1的砂岩—煤组合体，分别进行4种速率单轴加载试验，得出不同加载速率下煤岩组合体的力学行为及破坏特征。实时监测加载过程中声发射信号，计算碎屑平均粒径及远场碎屑质量占比，以定量评价破坏程度，分析煤岩组合体力学性质及破坏特征的应变率效应。研究结果表明：煤岩组合体单轴抗压强度、弹性模量、煤样破碎程度及脆性特征与加载速率均成正相关；在高加载速率条件下，非均质性对煤岩组合体力学行为的影响减弱。声发射振铃计数峰值随加载速率提高而增大，表明单次声发射强度增大，内部单次微破裂加剧。在较高加载速率条件下，煤岩组合体强度高，煤样破碎程度及脆性特征增强。

To investigate the mechanical behavior and failure characteristics of underground coal-rock combiation under different loading rates, sandstone-coal combination with a height ratio of 1∶1 were prepared and subjected to uniaxial loading tests at four different loading rates. The acoustic emission signals during the loading process was real time monitored. The average particle size of debris and the proportion of far field debris mass were calculated to quantitatively evaluate the degree of damage. The strain rate effect of the mechanical properties and failure characteristics of coal-rock combinations were analyzed. The results show that the uniaxial compressive strength, elastic modulus, degree of coal sample fragmentation, and brittleness characteristics of the combiation are positively correlated with the loading rate. Under high loading rate conditions, the influence of heterogeneity on the mechanical behavior of the combiation is weakened. The peak value of acoustic emission ringing count increases with the loading rate, indicating an increase in single acoustic emission intensity and an increase in the severity of internal single micro fractures. Under higher loading rates, the combination has high strength, and the degree of coal sample fragmentation and briteleness characteristics and enhanced.