Abstract
Abstract Biot‘s general consolidation theory is used to study time-dependent stress-displacement fields induced by tunnel excavation in a poroelastic saturated soil. The tunnel is considered circular and deeply embedded so an analytical solution can be obtained in the Laplace transform domain and the results in the time domain are obtained using a numerical technique for the inverse Laplace transform. Special attention is paid on the flow boundary condition along the tunnel wall. A partially sealing boundary condition is developed in order to represent most of the real practical situations. The permeable and impermeable boundaries are only two extreme cases of the general condition developed. The influence of the sealing condition on the stress, displacement and pore pressure fields is studied using a number of results presented in the time domain. It is concluded that the stress and displacement fields are highly sensitive to the flow condition imposed along the tunnel wall.
Published Version
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