Fastest Rapid Loading Methods of Vertical and Radial Consolidations

Abstract

Fastest curve-fitting procedures are proposed for vertical and radial consolidations for rapid loading methods. In vertical consolidation, the next load increment can be applied at 50–60% consolidation (or even earlier if the compression index is known). In radial consolidation, the next load increment can be applied at just 10–15% consolidation. The effects of secondary consolidation on the coefficient of consolidation and ultimate settlement are minimized in both cases. A quick procedure is proposed in vertical consolidation that determines how far cv is calculated from the true cv, where cv is coefficient of consolidation. In radial consolidation no such procedure is required because at 10–15% the consolidation effects of secondary consolidation are already less in most inorganic soils. The proposed rapid loading methods can be used when the settlement or time of load increment is not known. The characteristic features of vertical, radial, three-dimensional, and secondary consolidations are given in terms of the rate of settlement. A relationship is proposed between the coefficient of the vertical consolidation, load increment ratio, and compression index.