Shaking table test study on dynamic characteristics of batter piles in saturated sand

It has attracted attention about the seismic performance of batter pile in geotechnical engineering. However, there is few studies on the seismic performance of batter piles in liquefiable soil. Therefore, a series of shaking table tests of batter and vertical piles in saturated sand with geometric similarity ratio of 1:15 were carried out. Considering the dynamic interaction of superstructure pile foundation saturated sand, three kinds of seismic waves with different spectrum characteristics were input. Considering the dynamic interaction between superstructure, pile and saturated sand, three typical seismic waves with different spectrum characteristics were input. The horizontal acceleration of the superstructure and the pile cap, the rotational acceleration of the pile cap, the base shear force and the bending moment distribution of the pile were studied comparatively. The test results are drawn as follows. Batter piles foundation has greater horizontal stiffness, which can effectively reduce the horizontal acceleration of the superstructure and the pile cap, and the acceleration reduction of the pile cap is about 2 times larger than that of the superstructure. The pile cap of batter piles has obvious rotational vibration, and the rotational vibration of the pile cap of batter piles is greater than that of vertical piles. The base shear force of batter piles is smaller than that of vertical piles, and its seismic efficiency is not sensitive to the frequency spectrum characteristics of seismic wave. The maximum bending moment of batter pile appears at the pile top, and the spectrum characteristics of input seismic wave is one of the important factors on the maximum bending moment of batter pile. Through comparisons, the seismic performance of batter piles in saturated sand is better than that of the vertical pile. However, the rotational vibration of the pile cap and the bending of the pile head of batter piles should be emphasized. This study can provide an important reference for the promotion and application of batter pile foundation in similar projects. © 2021, Central South University Press. All rights reserved.