Abstract
Buckling load and buckling mode of a tunnel arch in two dimensions using a circular arc model are presented in this paper. Buckling analysis is first carried out on the circular arc under the uniform external pressure; the analytical results are then compared with theoretical results in order to check the validity of the method of analysis. Further, buckling verification was done by carrying out experiments on tunnel arch model. The arch was then analyzed under the same experimental conditions and proved to be sufficiently safe against buckling.
