Statistical Analysis of CMRI-RMR and Q-system for implementation in depillaring panels of Indian Coal Mines

For stability of any excavation proper design of support is essential [1]. A very common practice in underground is to make an estimation of rock load from the strata and its distribution over the underground mine workings is of prime importance [14, 17, 18]. In Indian coalmines, CMRI-RMR and NGI-Q Systems are mostly used for formulating design of support in rock engineering. Rock load in development galleries and junctions are usually calculated from CMRI-RMR while rock load for depillaring working (slices and goaf edges) is calculated on the basis of NGI Q[2, 3, 4]. In NGI Q[5, 6, 7] system cumbersome study is required which is very much time taking job. The research work carried out aims to provide equations for determination of rock load for slices and goaf edges alone by CMRI RMR system in depillaring panel, by correlating the observed value and actual values. The observed values are those values, which are obtained from modified equation using CMRI-RMR and actual values are those which are obtained from 8 case studies for slices and goaf edges from NGI-Q system.