Abstract
The purpose of this paper is to investigate the acceleration of consolidation through a new method composed by a cylindrical cavity expansion (CCE) combined with vertical drains (VD). In fact, the cylindrical cavity applies a radial displacement in the soil. Excess pore pressures will be consequently generated and the consolidation process will occur at the vicinity of the cavity wall. The dissipation of excess pore pressures can be enhanced in presence of VD installed at a radial distance r d from the center of the cylindrical cavity. During cavity expansion, the variation of excess pore pressures and incremental stresses are analyzed. The subsequent consolidation around the CCE in the presence of VD is solved using the Finite Difference Method (FDM) with taking into account the effect of the CCE installation. This effect is described by a decrease in horizontal permeability within a disturbed zone. Obtained results show that the proposed system of consolidation i.e., composed by a CCE combined with VD, greatly accelerates the consolidation of soil. Furthermore, the effects of the extent of the disturbed zone and the soil permeability reduction have a significant influence on the consolidation of the soil. The application of the proposed method to the case of “Tunis Rades La Goulette Bridge” is presented and discussed.
Published Version
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