Physical Similarity Simulation of Deformation and Failure Characteristics of Coal-Rock Rise under the Influence of Repeated Mining in Close Distance Coal Seams

Aiming at the problem that it is difficult to achieve accurate laying of model and precise excavation roadways in special surrounding rock structure roadway according conventional physical similarity simulation, which reduces reliability experimental results. An method, named “labeling positioning drawing line, presetting model” (LPDLPRM), was proposed. The simulation deformation failure characteristics coal-rock rise, under influence repeated mining close distance coal seams, carried out based on method infrared detection. results show rise seams affected by disturbances, characterized obvious asymmetric deformation, specific for stress strain near pillar were higher than other parts, cracks denser parts; when seam mined located, concentration weakened pressure relief upper seam; increases lower are mined, right side (coal side) most concentrated. Therefore, important take measures strengthen support control influenced mining.