Abstract Particle gradations significantly affects the dynamic response of water-saturated soft coal. To obtain the dynamic response of soft coal to various particle gradations, static and dynamic mechanical properties of water-saturated soft coal with different particle gradations were tested and compared. During these processes, the enhancement coefficient of the dynamic mechanical parameters to the corresponding static mechanical parameters was set as an index to describe the effect of non-uniformity coefficient Cu and median diameter d50. The results demonstrate that both the static and dynamic mechanical parameters of the water-saturated soft coal were affected by particle gradations. The enhancement coefficient was affected by both the d50 and Cu, which was microscopically attributed to effect of the d50 and Cu on the average dynamic liquid bridge force and scale dynamic rupture energy among the particles based on the microstructure and dynamic fracture evolution processes. In addition, the dimensionless scale rupture energy model among the water-bearing particles varied with the d50 and Cu were further established and applied to discuss the effect mechanism of particle gradations on the dynamic response of water-saturated soft coal. On this basis, the support measures of roadways in coal seam with different particle gradations were further discussed.

中文翻译：

---

不同颗粒级配含水饱和软煤动态试验及力学模型

摘要 颗粒级配显着影响水饱和软煤的动力响应。为获得软煤对不同颗粒级配的动态响应，对不同颗粒级配的水饱和软煤的静态和动态力学性能进行了测试和比较。在这些过程中，以动态力学参数对相应静态力学参数的增强系数为指标来描述不均匀系数Cu和中值直径d50的影响。结果表明，含水饱和软煤的静态和动态力学参数均受颗粒级配的影响。增强系数受 d50 和 Cu 的影响，这在微观上归因于 d50 和 Cu 对基于微观结构和动态断裂演化过程的颗粒之间平均动态液桥力和尺度动态破裂能的影响。此外，进一步建立了随 d50 和 Cu 变化的含水颗粒之间的无量纲尺度破裂能量模型，并应用于讨论颗粒级配对含水饱和软煤动力响应的影响机制。在此基础上，进一步探讨了不同颗粒级配煤层巷道支护措施。进一步建立了随 d50 和 Cu 变化的含水颗粒之间的无量纲尺度破裂能量模型，并应用于讨论颗粒级配对含水饱和软煤动力响应的影响机制。在此基础上，进一步探讨了不同颗粒级配煤层巷道支护措施。进一步建立了随 d50 和 Cu 变化的含水颗粒之间的无量纲尺度破裂能量模型，并应用于讨论颗粒级配对含水饱和软煤动力响应的影响机制。在此基础上，进一步探讨了不同颗粒级配煤层巷道支护措施。