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Experimental Evaluation of Subgrade Modulus and Its Application in Model Slab Studies
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1970-04-01
[PDF-3.85 MB]
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Abstract:In this report available theories of subgrade reaction are briefly reviewed, and a testing program is developed to evaluate the value of soil support K from small plate load tests used in the discrete-element solution of small-dimension slab-on-foundation problems. The results confirm that the k-value of soil depends not only upon the diameter of the plate, but also on the amount of soil deformation. A small dimension slab was tested on a thin asphalt-stabilized layer under a center load up to 200 pounds. Deflections and stresses were measured for each solution based on the k-value determined from plate load tests on the layered system. The agreement between the two solutions is within 5 percent in the interior of the slab near the point of load application. The effect of cyclic loading to a constant deflection produce some permanent deformation in the layered foundation. By the tenth cycle the applied load appeared to start stabilizing.
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