Abstract
ABSTRACT Plastic drains generally band or strip shaped, are often installed in square or triangular arrays. The horizontal coefficient of permeability measured in situ from around a plastic board drain indicated three distinct zones, viz., an inner smear zone consisting of highly remolded soil, an outer transition zone, and soil unaffected by the drain installation. Thus, the plastic drain treated soil is modelled as a two dimensional consolidation problem consisting of these three distinct zones. The resulting equations are solved numerically to obtain the degree of consolidation versus time factor curves. The extent and the value of the coefficient of permeability of the inner smear zone are shown to be the primary factors controlling the consolidation behavior of the soil. Based on the results from this study, it is recommended that the response of plastic drain treated soil can be improved by reducing the mandrel size and/or modifying the shape of the drain to a circle or an ellipse, rather than by having only a closer spacing of the drain.
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