MECHANICAL CHARACTERISTICS OF ROCK SEGMENT FOR REDUCING AMOUNT OF CEMENT USE AND STABILITY OF DRIFT TUNNEL

Abstract

 Methods of constructing tunnels using the minimum quantities of cement-type support materials for high-level radioactive waste disposal facilities have been developed. Research and development concerning the technical aspects of the formation of rock segments using low alkaline mortar have been conducted. This study examined the mechanical characteristics of rock segments and backfill materials and analyzed the stability of the drift that is supported by the rock segments and gravel backfill. The results confirmed the technical aspects of the formation of the rock segments and the effectiveness of the planned efforts to further reduce the amount of cement used.