关键词: 叠加应力, 持续变形, 注浆加固, 巷道治理, 全长预应力锚固

Abstract: In order to solve the problem of serious deformation of roadway under the influence of stress superposition of overlying coal pillars, the deformation law of roadway is studied through field measurement, and the fracture characteristics of surrounding rock are analyzed by means of borehole peeping and hydrostatic water injection test. A comprehensive treatment scheme of grouting first, then fastening, and finally strengthening with pre stress anchor cable is formulated, and industrial test is carried out. The results show that: The initial deformation stage is 0-18 days after restoration, which is the key stage of roadway treatment. The Shallow coal wall has a large number of fissures with good connectivity, and the deep coal wall have a small number of fissures with poor connectivity, It is necessary to use prestressed anchor cable for full-length anchoring to reinforcement. After the comprehensive treatment scheme is adopted, the roadway deformation is effectively controlled, the maximum floor heave is 51mm, and the maximum approach of the two sides of the roadway is 42mm ，the settlement of roof is 4mm, and the deformation of roadway is effectively controlled.