Since the mid-1970s, extensive research has been conducted internationally on the characteristics of precast cement concrete pavements. German researcher [PERSON] proposed a precast cement concrete pavement system incorporating recycled asphalt mixture as the base layer, enhancing its applicability to urban road construction. [PERSON] et al. from Isfahan University of Technology in Iran employed finite element analysis to simulate precast cement concrete pavements on elastic-plastic foundations, conducting an in-depth investigation into their mechanical behavior and analyzing the effects of variables such as slab thickness and load [18; 19]. The Virginia Department of Transportation conducted experimental evaluations on the repair performance of precast concrete slabs with varying dimensions and manufacturing processes. These studies collectively offer a theoretical foundation for the prospective engineering applications of precast concrete slabs. Australian researchers [PERSON] et al. performed a series of experiments to investigate the influence of base materials on precast cement concrete pavement performance, formulated a design methodology for precast block pavement structures, and contributed to a robust theoretical basis for road construction and maintenance [20; 21]. Based on the problem of how to effectively use waste coal gangue in the existing research, combined with the inspiration of previous research results, this study innovatively proposes a solution to use waste coal gangue as concrete aggregate and prepare assembledpavement concrete blocks in coal mines. The coal gangue is selected from Liangshuijing coal mine. The mine discharges about 150,000 tons of coal gangue per year, and there is an urgent need for solid waste consumption. There is a concrete block production line within 3 km of the mine, which can convert solid waste in situ and reduce transportation costs. Initially, the material properties of cement, fly ash, and coal gangue were analyzed to determine their compositional characteristics. Subsequently, the influence of various steam curing regimes on the compressive strength of fly ash blocks was investigated to identify the optimal combination of curing parameters. Following this, the mechanical performance of the specimens under compressive, tensile, and shear loads was evaluated, accompanied by systematic assessments of acid resistance, alkali resistance, sulfate attack resistance, and hydrolysis behavior. The compressive strength of specimens at various immersion ages was subsequently measured. Finally, considering actual underground conditions, ANSYS-based numerical simulations were conducted to investigate the stress-strain behavior of modular pavements under varying block thicknesses, load magnitudes, and dynamic loading, ultimately determining the optimal dimensions of the pavement blocks. This approach not only accelerates underground roadway construction but also substantially reduces the consumption of sand, gravel, and cement, thereby lowering coal mine production costs. Moreover, it addresses the ecological and environmental issues associated with solid waste accumulation in mining areas, offering significant economic benefits and environmental value.