Research on Safety Step Distance for Rapid Construction of Mabaishan Hard Rock Tunnel
Mabaishan Tunnel is a double-tube single-track tunnel located in the area of Qinling Mountains.The tunnel is mainly composed of Yanshanian granite,with coarse-grained granitic texture and massive structure,mainly Class Ⅱ and Ⅲ surrounding rocks,belonging to hard rock mass.Considering the toolkit configuration and the workspace requirements at the Mabaishan Tunnel construction site,this paper proposes a long-distance safety step distance based on on-site tests,which is suitable for full-face excavation and corresponding support conditions.This ensures the rapid construction of hard rock tunnels and efficient organization and implementation of various work processes.The study can provide reference for the construction of similar hard rock tunnels.
Xi'an-Shiyan HSRtunnelmechanized constructionhard rock masssafety step distance
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