Abstract:

The importance of study on mechanical parameters of rock mass is elaborated, and some methods and their principles that are often used to determine rock mass mechanical parameters at home and obroad are introduced systematically. Then taking the research of rock mass mechanical parameters from Yunxi Datun Tin Mine for example, based on the rock physico-mechanical parameters which were obtained by indoor laboratory test and the rock mass quality evaluating RMR value, the rock mechanical parameters are reduced and attenuated by these methods; and the results of rock mass mechanical parameters are obtained．The comparative analysis of the results and project application results of recommended values show that：the latest Hoek-Brown criterion, laboratory test, M. Georgi method and Г.ΦИCEHKO method are combined to study and analyze, so that the rock mass mechanical parameters obtained are more reasonable, and computational accuracy of the project rock mass mechanical parameters may be improved.

Key words: Hoek-Brown method, M.Georgi method, Г.ΦИCEHKO method, rock mass mechanical parameters, reduction