ANALYSIS OF STRESS AND DISPLACEMENT AROUND A DEEP CIRCULAR TUNNEL IN VISCOELASTIC SOIL

Based on Biots theory of consolidation, the stresses, displacements and pore pressure induced by a deep tunnel excavation in viscoelastic saturated soil are investigated in the Laplace transform domain using the coupled poro-mechanical model. The liner and the soil are assumed to be porous medium. The tunnel is partially sealed and the boundary of tunnel is partially permeable. Numerical results are obtained by inverse Laplace transformation and are used to analyze the distribution of stresses, displacement and pore pressure around the tunnel. The influence of permeability of the tunnel boundary and soil viscosity on the field of stresses, displacements and pore pressure is discussed.