Study on deformation characteristics and control technology of surrounding rock of goaf roadway in Digjinwan Mine

In order to solve the problems of severe ore pressure and serious instability deformation in gob-side roadway of Digjinwan Mine, research methods such as ore pressure monitoring and numerical simulation are comprehensively adopted to study the surrounding rock failure characteristics, overburden migration characteristics and roof pre-cracking pressure relief technology of gob-side roadway, and field industrial verification is carried out. The research shows that: The optimal Angle and height of the roof precracking are 10° and 16 m. After the roof precracking and filling in the upper section, the surface deformation of goaf roadway in the opening stage is reduced by about 50%, and the surface deformation of the working face in the mining stage is reduced by more than 70%, and a good deformation control effect is obtained.