Technology for roadway management of fractured rock masses in a submarine gold mine

Sanshandao Gold Mine is a submarine gold mine. Its southwest wing encounters many engineering problems including large roadway deformation,roof flooding and hidden void area. A comprehensive study using theoretical analysis,field tests and numerical simulation was performed to investigate the behavior of a roadway excavated in fractured rock masses. An integrated support technology was proposed. The results show that the specific location of the fracture cavity can be accurately identified by combining chemical element analysis,geological radar scanning and drilling technology. With the integrated support technology of shotcrete anchor penetration integrated support model, the roof subsidence and the wall-to-wall convergence were decreased by 15.41 mm and 15.36 mm, respectively, compared with the original simulated support scheme. In addition,in order to ensure the expected effect of the field construction,specific technical requirements were put forward for the field construction technology,and the field monitoring of the displacement around the site was carried out to effectively control the roadway deformation. The scheme provides a reference for other similar areas of the mine.