Study on the bending moment diagram of straight and inclined pile groups in saturated sands with different thicknesses

Abstract

The dynamic response law of a pile foundation in liquefied soil has always been a significant issue in the field of seismic engineering. This paper is based on a shaking table test of 2×2 straight pile groups and 2×2 inclined pile groups in nonliquefied sand and saturated sand with different thicknesses. The bending moment of pile in nonliquefied sand and saturated sand with different thicknesses was studied by applying the Qian'an wave with a certain frequency and acceleration. It shows that the liquefaction of sand will cause the bending moment of pile body to increase. Under the same working condition, the bending moment of inclined pile is smaller than that of straight pile. The difference of bending moment at the bottom of pile is larger, and the difference is more obvious with the increase of the thickness of liquefied sand. Therefore, the inclined pile is more resistant to external load than the straight pile.