Numerical Simulation of Seismic Soil-Pile Interaction in Liquefying Ground

Desen Kong,Yazhou Li,Meixu Deng

doi:10.1109/access.2019.2925664

Abstract

In this paper, the pile-soil interaction of the pile foundation of an inclined straight alternating group in a liquefiable site under a seismic load was studied through the form changes to the pile cap within the inclined straight alternating group. Based on an analysis of the soil acceleration, hole pressure ratio, horizontal displacement of the pile body, vertical displacement of the pile body, and bending moment of the pile body, the dynamic characteristics of the pile soil at the free site are studied with two layers of liquefiable soil. The results show that the sand layer can amplify seismic waves under a seismic load, and therefore, the soil acceleration under the pile foundation model of the high-rise pile cap group is slightly greater than that of the low-rise pile cap model; then, the pore pressure ratios at the monitoring point in the low-rise pile cap and high-rise pile cap pile foundation models present certain fluctuations. The analysis of the pile displacement and the bending moment shows that the pile foundation from the high-rise pile cap group can resist the seismic load better than that from the low-rise pile cap group.

Highlights

Inclined straight alternating piles are widely used in port wharf construction, bridge engineering and long-span building structures
Two layers of a liquefiable soil-free site in the inclined straight alternating group model allow for dynamic analysis of the pile foundation; by changing the form of the pile caps, the acceleration of soil, the pore pressure ratio, the horizontal and vertical displacement of the pile and the pile bending moment, the following conclusions have been reached
2) The bottom soil acceleration of the high-rise pile cap foundation model is slightly greater than the value of the lowrise pile cap model, which is due to the contact between the soil and the low-rise pile cap that produces a pressure effect on the lower soil body; it is due to the load of the upper structure of pile foundation of the inclined straight alternating group of the high-rise pile cap being transferred to the soil body of the pile side

Summary

INTRODUCTION

Inclined straight alternating piles are widely used in port wharf construction, bridge engineering and long-span building structures. At present, the obtained research results mostly focus on low-rise pile cap group or high-rise pile cap group pile foundations, while the influence law of the cap type on the seismic interaction characteristics of the inclined straight alternating pile group soil has been rarely reported. The soil acceleration, pore pressure ratio, horizontal displacement of pile body, vertical displacement of the pile body and the bending moment of the pile body are analyzed, and the influence law of the type of the pile cap on the pile-soil dynamic characteristics of the inclined straight alternating pile group is studied, which provides a theoretical and technical support for improving the seismic design methods for the inclined straight alternating group pile foundation at the liquefied site

NUMERICAL MODEL AND CALCULATION PARAMETERS

SEISMIC WAVE SELECTION

CONCLUSION