Study on surrounding rock stability of working face with different filling methods based on the dynamic evolution of goaf stiffness
Ji Yuxin 1, Song Gaofeng 2, Li Yan 1
1. School of Civil Engineering, Ordos Institute of Applied Technology, Ordos 017010, China; 2. School of Civil Engineering, North China University of Technology, Beijing 100144, China
In order to study the overlying strata movement law and strata control effect of partial filling coal mining technology, the dynamic evolution of filling body strength in goaf was considered, and the numerical model of full filling and partial filling was established. Under the influence of different filling methods, the development law of surrounding rock pressure, the development degree of coal plastic zone in front of working face, the displacement and deformation of coal body, the evolution law of roof and floor displacement, the displacement of overlying strata and the law of surface subsidence were studied and compared. The results showed that compared with the full filling mining technology, the peak value of the abutment pressure increase coefficient in front of the working face of the partial filling model increased from 3.3 to 3.8 ; the displacement of the coal wall in the working face increased by about 10 mm ; the width of plastic zone increased by about 0.72 m. The maximum subsidence of the immediate roof was increased by about 9.3 mm, and the maximum subsidence of the overlying rock was increased by about 12.7 mm. It was concluded that the surrounding rock control effect of partial filling coal mining technology was slightly worse than that of full filling coal mining technology, but it was generally within the acceptable range.
冀宇鑫1,宋高峰2,李 燕1. 基于采空区刚度动态演化的不同充填方式工作面围岩稳定性研究[J]. 煤炭与化工, 2025, 48(7): 31-36.
Ji Yuxin 1, Song Gaofeng 2, Li Yan 1. Study on surrounding rock stability of working face with different filling methods based on the dynamic evolution of goaf stiffness. CCI, 2025, 48(7): 31-36.
