Análise dos efeitos da consolidação em escavações escoradas em solos moles com reforço de fundo em jet grouting

Abstract

Using a numerical model based on the finite element method, a bottom-jet-grout-slab-reinforcedbraced excavation in soft soil is analyzed. The numerical model incorporates the Biotconsolidation theory (coupled formulation of the flow and equilibrium equations) with soilconstitutive relations simulated by the p-q- critical state model. The importance of the jet-groutslab construction in order to increase stability against bottom heave failure and decreasedisplacements of the wall and the ground is particularly assessed. Special emphasis is given tothe analysis, during and after the construction period, of the pore pressures, shear stresses, stresslevels and displacements in the ground, as well as strut compression forces, wall displacementsand bending moments, pressures on the wall and jet-grout slab compression forces and bendingmoments.