Study on Failure Characteristics and Control Technology of Roadway Surrounding Rock under Repeated Mining in Close-Distance Coal Seam

In this study, taking the Sheng’an coal mine as an engineering background, failure characteristics of surrounding rock a roadway under repeated mining in close-distance seam is comprehensively illustrated through field measurements (e.g., drilling imaging), theory analysis and numerical simulation (finite difference method (FDM)). The results show that although return airway 10905 remains intact, apparent roadway’s roof pillar can be observed. addition, expression floor depth caused by upper obtained elastic-plastic theory. Meanwhile, deformation increases with increase times, especially for horizontal displacement on side. Moreover, cracks’ evolution observed asymmetric characteristics. Finally, stability control technology “asymmetric anchor net cable + I-steel” proposed to prevent potential disasters, feasibility support scheme verified practices. It meet requirement safe provide guidelines effectively solve mining.