Lateral Bearing Capacity of Embedded Pile Foundation under Sinusoidal Excitation

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There are Three factors that affect resistance of the underground structure of building against seismic force, that is, (a) front and back earth pressure, (b) lateral face friction on the side walls and (c) resilient rigidity of piles. This study aims at clarifying the lateral bearing capacity of embedded foundation, and analyzing the characteristics of earth pressure in earthquake. To study, sinusoidal excitation tests were made under the restricted conditions using an oscillating soil bin, followed by the finite element analysis simulated with pseudo-three-dimensional models. The study of parameters was also made in analytical method under different conditions.From these tests and parameter analysis, it was found that the lateral bearing capacity of embedded foundation could be easily explained through the behavior of both foudation and soil. When the amplification magnitude of the structure was larger than that of the ground, the lateral force distribution ratio of the earth pressure exceeded 50% and that of the piles decreased to about 25%. Lateral face friction ratio is about 10-30% and does not significantly depend on the superstructure.