Mechanical properties and progressive failure characteristics of sandstone containing elliptical and square openings subjected to biaxial stress.

ABSTRACT: Two kinds of common tunnel shapes, i.e. elliptical opening and square opening were selected for biaxial compression tests, and the influences of two kinds of opening shapes on the mechanical properties, failure characteristics and failure modes of sandstone were compared and analyzed. The complex variable theory and mapping functions were used to obtain the analytical stress solution around elliptical and square openings. The results show that the stability of the specimen containing an elliptical opening was better than that of the specimen containing a square opening under the same lateral stress. Compared with the elliptical opening, the local damage was formed earlier in the square opening which might be caused by a higher stress concentration around the square opening. The stress dist

SUBMITTER: Zhao H 

PROVIDER: S-EPMC7932157 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature