Abstract
It is thought that a best way to apply a distinct element method built in reliable mechanical models of discontinuities to the estimation of mechanical stabililty of underground openings and to bring its results into designs. In this paper, the conditions that formulation has appropriateness and reliability, are shown by means of taking up some representative models in the past and by considering any questions in the formulations. Next, a new mechanical model of discontinuities which is based on that considerations is proposed, appropriateness and reliability of the model are verified by means of comparison among the result of shear test, and the comparison between the proposed model and Barton model in the reproduction analysis of shear test. As an example, simulation of underground opening excavation is tried.
