50th US Rock Mechanics / Geomechanics Symposium 2016
Authors analyzed four geomechanical hypotheses used in rock mass classifications (RMC): hypothesis No.1: the loads on rigid support for the equal criteria of the RMC are equal; hypothesis No.2: scale factor and rock mass mechanical characteristics are the same for different sizes of underground constructions; hypothesis No.3: load on the support is independent from opening size for the same geomechanical condition; hypothesis No.4: support capacity is determined by value of the maximum load on the support. Authors ascertained that the hypotheses are verisimilar but not one of them was proved. They are introduced in empirical approach in order to compensate insufficient statistics data. Approach for estimation rock mass mechanical characteristics and Theoretical-Experimental method for estimation rock pressure manifestation in underground openings are proposed.
Year of publication: 2016