Through the similarity ratio design of the shaking table model for 2×2 straight oblique group piles

the lateral dynamics of the group-piling-superstructure system in non-liquefied sand and saturated sand under excitation of sine waves with different frequencies are carried out.The experimental results show that:（1）In the case of the sine wave with the same frequency

the dynamic response magnification in the saturated sand is greater than that in the non-liquefied sand for both straight pile group and diagonal pile group.The lateral dynamic response of the straight group pile is more significant than that of the inclined pile group.（2）With the increase of the frequency of the input wave

the dynamic response coefficient of the bearing structure in each test condition increases

and the increments of the acceleration and the displacement of both straight pile group and inclined pile group in the saturated sand condition is more obvious than that in the non-liquefied sand condition.The dynamic response of the straight pile group is more significant than that of the inclined pile group.The research results of this paper provide a scientific reference for the seismic theory of pile foundation

and serve the design of related pile foundation engi neering in the future.