Evaluation and analysis of rock mass quality of large chamber group in steep dip strata

The blind shaft chamber group of Maoping lead-zinc mine in northeast Yunnan is mainly located in devonian and carboniferous strata.The roof and side of the chamber group collapse, disintegration and large deformation failure occur.In order to control the failure problem of the chamber group, on the basis of comprehensive analysis of geological data and previous support methods, the rock mass is evaluated in the exposed chamber area by using RQD index basic analysis method, South Africa RMR classification method and GSI.Combined with the actual conditions of the chamber, the rock mass mechanical parameters of different strata are calculated by using ROC lab software, which provides a theoretical basis for the later treatment scheme.