STUDY ON THE DESIGN METHOD OF THE EXTRUDED CONCRETE LINING METHOD BASED ON THE INVESTIGATION AND ITS ANALYSIS IN AKIMA TUNNEL OF HOKURIKU SHINKANSEN

Abstract

This study discusses the field tests and its analysis on the Extruded Concrete Lining method which was adopted in the Akima Tunnel of Hokuriku Shinkansen Project (Hokuriku Super-Express Line Project) as the first application in Japan, and the ground pressure which are important factors to design the tunnel lining. We propose the method to obtain the strength and the modules of elasticity of concrete at the age of removal of forms from the maturity, and the method to obtain the ratio of release of rock. the newly proposed design method is based on the limit state design method. In this method, it's prescribed that the compressive-section area shall be down to 50% of the entire design section.