This paper is based on a shaking table test of 2 × 2 straight pile groups and 2 × 2 inclined pile groups in non-liquefied sand and saturated sand with different thicknesses. Under the sine wave with a certain peak acceleration and frequency, the lateral dynamic response characteristics, the distribution law of the maximum bending moment envelope diagram, and the p–y curve of the straight and inclined pile groups are studied. The results show that the bending moment of the straight pile group is 3~4 times that of the inclined pile group at the bottom section of the pile in the 300 mm saturated sand. When the thickness of the saturated sand increases to 380 mm, the maximum bending moment of the straight pile group is 6~7 times that of the inclined pile group at the bottom section of the pile. Through the comparison of indicators, it shows that the inclined pile group can have better bending resistance when subjected to the same lateral dynamic load.

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.