Abstract
Many clays in situ are lightly overconsolidated with overconsolidation ratio ranging between 1.0 and 4.0 due to various reasons. However, the conventional theories used for analysis of radial consolidation assume the soils to be normally consolidated. For lightly OC Clays, phase transition occurs from overconsolidated to normally consolidated state due to increase of effective stress beyond the preconsolidation stress during the consolidation process under external loading. This paper presents a comparison of the results of linear and non-linear theories of radial consolidation of lightly OC clays. The effects of overconsolidation ratio, stress increment ratio and recompression to virgin compression compressibility ratio are studied. While the pore pressure dissipation rate with time is relatively slower, the rate of change of degree of settlement is relatively faster in the case of non-linear theory compared to that in the linear theory of radial consolidation of lightly OC clays. The difference in the results of linear and non-linear theories is significant only in the intermediate stages of consolidation of lightly OC soils.
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