Abstract
During the process of coal mining, the CH4 produced by the coal will be released in the workspace. With the movement of the working face, the overlying strata will be moved or destroyed, resulting in the continuous development of mining cracks and thus the forming a methane enriched area. The study of methane enrichment law is helpful for methane extraction and utilization, and at the same time reduces the risk of workspace. The development of the mining fracture field in overlying strata is determined by the process of overlying strata movement. Since there are many factors affecting the migration of overlying strata, the migration process of the rock strata is complex and the field is limited by many conditions, it is difficult to detect the distribution of the fractured field in the overlying strata. In this paper, the evolution law of mining fracture field will be studied by similar material model test. Based on the geological conditions of the 12# coal seam in Nanzhuang coal mine, Yangquan, the paper uses the similar model test to analyze and discuss the evolution law of the mining fracture field in the overlying strata of the coal seam, which provides a theoretical basis for the design of the mining scheme for the mining in the adjacent layer of the coal seam of the 12# coal seam.
