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VIANNA, A. P. F. Size and matric suction influence in the behavior of shallow foundations in unsaturated sandy soils. Tese (Doutorado) Escola de Engenharia de São Carlos, Universidade de São Paulo. São Carlos, 2005, 170 p. The influence of matric suction and size of footings in the bearing capacity and settlement of shallow foundations in unsaturated sandy soils are analyzed. Fourteen plate load tests were performed in the first part of the research. Rigid metallic plates with diameters 0,20, 0,40, 0,80 m and one concrete circular footing with 1,50 m were used in the tests. All plates and footing were positioned at 1,50 m depth. The tests were performed in the Foundation Experimental Field of USP / São Carlos. Due to the soil collapsible character, the tests were performed with the monitoring of matric suction pressure through tensiometers installed in the bottom of the holes. Centrifuge tests were carried out at the University of Colorado at Boulder in the second part of the research. Metallic plates with 30 mm, 50 mm and 100 mm were used and the gravity levels were 1 g, 5 g, 10 g, 15 g, 25 g, 50 g e 100g. The plates were positioned on top of a sandy soil with three moisture conditions: dry, flooded, and non-flooded. Thus, the capacity will be analyzed taking into consideration both the geometry of the tested plates and the influence of the matric suction pressure. The footing size influence in the settlement was also analyzed. A substantial increase of the plate-soil system bearing capacity and a considerable decrease in the settlements, caused by matric suction increase, was confirmed. It was also demonstrated that the bearing capacity and settlements variations are not a linearly increasing function of the size as theoretical methods suggest. For small footings, the bearing capacity and settlement increase as the footing size decreases. Key-words: bearing capacity, shallow foundations, settlement, size effect, matric suction, unsaturated sand.

Influência da dimensão e da sucção matricial no comportamento de fundações superficiais assentes em solo arenoso não-saturado