2011 Volume 7 Issue 1 Pages 11-16
This paper presented the formulation of a divided linear strain softening model of soft rock using the unconfined compressive strength for incorporation into a numerical analysis code, and applied the model to sequential tunnel excavation analysis. The effectiveness of the model and problems in relation to numerical analysis were discussed. As problems in making analysis, the volumetric change (dilation) during strain softening causes turbulence in the distribution of displacements, and the variations of stress in elements due to stress release during strain softening greatly affect the results of analysis. It was therefore suggested that properly controlling stress variations would produce excellent results.
