Abstract
ABSTRACT Vertical drains are usually installed in alluvial weak subsoil consisting of several layers. Several existing solutions of centripetal consolidation considering the well resistance are available. Those are, however, inapplicable for multilayered ground. Taking well resistance into account, a numerical analysis method is presented in this study to solve the consolidation problem in multilayered anisotropic clayey subsoil in which vertical drains have been installed. The analytic results coincide well with the observed results obtained through a pair of in-situ consolidation tests. As a consequence of calculations for many cases of two-layered problems where both degree of heterogeneity and thickness ratio between the 1st and the 2nd layer differ from each other, it is indicated that the consolidation of a two-layered ground is significantly retarded than that of the single-layered ground whose coefficient of consolidation is equal to the mean value of the two-layered ground. A new procedure is next proposed for predicting the consolidation degree of multilayered ground using existing equations concerning single-layered centripetal consolidation. The accuracy of this procedure is discussed in comparison with the numerical results. The experimental results also reveal that the proposed procedure yields a sufficiently accurate consolidation curve for multilayered ground without the need for a computer.
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