Multi-field coupling effect of deep excavation under the stress path of unloading

摘要

Multi-field coupling effect of deep excavation is investigated under the stress path of unloading.First, based on two surfaces model, an elasto-plastic model for clay under different stress paths is established.Second, the constitutive model is introduced into the Blot consolidation equations.Then the incremental frame of governing partial differential equations is established to be suitable for this problem.Third, a physical equation for pore water pressure and the fundamental solutions are presented for the plane strain problem.By use of the fundamental solutions, a semi-analytical and semi-numerical method is presented.Fourth, the method has been applied to numerical analyses of consolidation in deep excavation.It is indicated that this method is reasonable, which can reflect the effect of unloading stress path on horizontal displacement, settlement and pore water pressure.