LOAD SETTLEMENT RELATIONSHIPS OF CIRCULAR FOOTING CONSIDERING NEGATIVE DILATANCY CHARACTERISTICS OF LOOSE SAND

概要

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Experimental studies on quantitative load-settlement relationship have been well presented, which were carried out with vertically loaded spread foundation on sand ground. However, mechanical properties regarding the relationship have not been theoretically understood. In the previous paper, we elucidated experimentally and theoretically the mechanical properties on dense sand ground. The present study provides the analysis of mechanical properties on loose ground through similar model experiment to the previous one. Under about 15% of the range in a ratio of settlement to the diameter of footing, load-settlement relationship was found to be successfully analyzed through FEM simulation with SMP-Cam-Clay model which was estimable of the negative dilatancy of sand. The FEM simulation reveals that under the range 1.3%, the sand ground under footing exhibits contractile behavior with negative dilatancy, while between 1.3 and 15%, sand behavior undergoes shifts from contraction to contraction and subsidence with slip line directly below edge of footing. Over about 15%, the FEM simulation was apparently not applicable for the analysis of load-settlement relationship and load-settlement relationship shows a good agreement with the subsidence characterized by bearing capacity based on Terzaghi's theory.
日本建築学会の論文