Several special mechanical properties, such as dilatancy and compressibility, of cemented paste backfill (CPB) are controlled by its internal microstructure and evolution. The mesoscopic structure changes of CPB during the development process were investigated. On the basis of the scanning electron microscopy (SEM) and mechanical test results of CPB, the particle size information of CPB was extracted, and a two-dimensional particle flow code (PFC) model of CPB was established to analyze the evolution rule of mesoscopic parameters during CPB development. The embedded FISH language in PFC was used to develop a program for establishing a PFC model on the basis of the SEM results. The mesoscopic parameters of CPB samples at different curing times, such as coordination number (C_n), contact force chain, and rose diagram, were obtained by recording and loading and used to analyze the intrinsic relationship between mesoscopic parameter variations and macroscopic mechanical response during CPB development. It is of considerable significance to establish the physical model of CPB using the PFC to reveal the mesoscopic structure of CPB.

胶浆回填材料（CPB）的几种特殊的机械性能（例如，膨胀性和可压缩性）受其内部微观结构和演化的控制。研究了CPB在开发过程中的介观结构变化。根据CPB的扫描电子显微镜（SEM）和力学性能测试结果，提取CPB的粒度信息，建立CPB的二维粒子流编码（PFC）模型，分析介观的演化规律。 CPB开发过程中的参数。PFC中嵌入的FISH语言用于开发基于SEM结果建立PFC模型的程序。CPB样品在不同固化时间的介观参数，例如配位数（C _n），接触力链和玫瑰图是通过记录和加载获得的，并用于分析CPB开发过程中介观参数变化与宏观机械响应之间的内在关系。利用PFC建立CPB的物理模型以揭示CPB的介观结构具有重要意义。