Research on efficient and safe mining scheme for wide pillars wrapped by fillings

The basic mechanic characteristics and properties of surrounding rock masses and fillings in the stope are obtained through the analysis of the surrounding fillings and isolation layers of the testing stope.And then the method of large-diameter deep-hole stoping with subsequent filling is applied as the technique for the mining scheme by considering the charge of the mining techniques and available equipment.The results derived by the numerical analysis of the stress,deformation and failure characteristics of surrounding fillings during the mining demonstrate that mining by recovery unit of upper and lower plate is the optimal scheme.The successful application of the mining scheme with related research methods and results can be served as references for similar projects to guarantee the safety and efficiency in mining "island" ore block with filling mining method.