Microcosmic structure analysis by SEM and creep test on undersea tunnel tuff

摘要

To study the property of tuff, microcosmic structure characteristics of tuff was analyzed by SEM, also uniaxial compression test and creep test were made . The results indicated: microstructure of tuff was compact slices fusion structure; Immediate deformation of creep was over 80% of total deformation, and stress threshold existed in rock creep; As load increasing, rock creep become stable in a short period. Attenuation creep appeared under multitude stress levels, but deformation rate decreased with time and would be convergent at last.