Abstract
A non-linear analysis for a circular soft rock tunnel in a hydrostatic stress field has been performed theoretically, in order to make squeezing characteristics clear. The material behaviour is described by a non-linear elasto-plastic stress-strain model and a non-linear failure criterion proposed by Brown. The ratio of strength and initial tangent modulus of a stress-strain curve is thought to be independent of confining pressure. Closed form solutions of stresses, strains and displacements have been obtained. By performing parametric studies, effects of the non-linearity of stress-strain relationships on a stress pass, squeezing characteristics and relationships between internal pressure and displacement have been made clear.
