Reasonable coal pillar size of roadway protection is an important guarantee for roadway stability under the action of static-dynamic coupling loadings in deep mines. Coal pillar and roof-floor rock form a non-integral contact structure of coal and rock. However, in the existing literature, there is no research on the size of the coal pillar under static-dynamic coupling loadings based on the non-integral contact structure of coal and rock. In this study, the coal-rock non-integral contact composite specimens are designed, and the coal pillar size is simulated by the radial sizes of the specimens. The failure characteristics of coal-rock under the static-dynamic coupling loadings are studied by the SHPB test, which provides the basis for the design of coal pillar size, and finally determines the reasonable coal pillar size by combining with numerical simulation. The test results show that the strength of the specimens decreases with the decrease of section size of coal and increases with the increase of dynamic load, but there is a critical value for static load. When the coal sections radial sizes are 50, 45, and 40 mm and dynamic loads are applied, the stress-strain curve of the specimens has a plastic stage, but the rest do not exist. The minimum coal section radial size which can ensure the stability of the specimens is 40 mm, and the similar calculation of coal pillar size is 88 m. Combined with numerical simulation, the final coal pillar size is 90 m. This study provides a more accurate and reliable method to determine the size of a coal pillar under the action of static-dynamic coupling loadings.

合理的巷道保护煤柱尺寸是深井静动力耦合荷载作用下巷道稳定的重要保障。煤柱与顶底板岩石形成煤与岩石的非整体接触结构。然而，现有文献中并没有基于煤岩非整体接触结构对静-动力耦合载荷作用下煤柱尺寸的研究。本研究设计了煤岩非整体接触复合试件，通过试件径向尺寸模拟煤柱尺寸。通过SHPB试验研究静动力耦合作用下煤岩的破坏特性，为煤柱尺寸的设计提供依据，最后结合数值模拟确定合理的煤柱尺寸。试验结果表明，试件的强度随煤断面尺寸的减小而降低，随动载荷的增加而增大，但静载荷存在临界值。当煤断面径向尺寸为50、45和40 mm并施加动载荷时，试件的应力-应变曲线出现塑性阶段，其余部分不存在。保证试件稳定性的最小煤截面径向尺寸为40 mm，煤柱尺寸类似计算为88 m。结合数值模拟，最终煤柱尺寸为90 m。该研究为确定静-动力耦合载荷作用下煤柱的尺寸提供了一种更准确可靠的方法。