Rigid Plate Settlements on Soils with Varying Deformation Properties

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Courtesy of ASTM International

The need to reliably predict foundation settlements has led to the use of plate-loading tests as a method of in situ determination of soil-deformation properties. The results of bearing-plate tests, especially when presented in graphical form, serve as a way to estimate allowable pressures and deformation moduli calculations. The magnitudes of plate settlements and the configurations of plate load-settlement curves determine decisions as to the acceptance of certain types and dimensions of foundations. This paper describes settlements of plates/experimental footings on soils in which deformation properties improve with increasing depth. A simple interpretation formula is offered to calculate allowable pressures. The application of this formula is demonstrated in plate-load test results published in the literature. Erratum to this paper appears in 18(3).

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