Application of Extension Theory to Rock Mass Quality Evaluation of Underground Engineering

On the basis of matter-element theory and dependent function,the extension theory was applied to evaluate the rock mass quality,and an extension model for quality evaluation of rock mass was build. In view of the variety and complexity of the factors influencing rock mass quality,the factors reflecting the engineering characteristic were taken into account for evaluation based on RMR method,then taking some rock mass of a mine for example,the extension evaluations for rock mass quality were carried out. The weights of factor were calculated by using improved AHP method,which avoided the excessive effect of subjective factor of human in practices,and made the evaluation results more objective. Compared with the evaluation results by the traditional RMR method,the research indicates that the extension method is reasonable and feasible in the field of evaluating rock mass quality classification,and the results have the more intuitive characteristic. 4tabs.,10refs.