Performance of a Subgrade-Embankment-Seawall System Reinforced by Drainage PCC Piles and Ordinary Piles Subjected to Lateral Spreading

Author:

Chen Zhixiong1ORCID,Wang Buxin1ORCID,Wang Chenglong12ORCID,Wang Yonghong3ORCID,Xiao Peng4ORCID,Li Kangyin1ORCID

Affiliation:

1. College of Civil Engineering, Chongqing University, Chongqing 400045, China

2. Academy of Dazu Rock Carvings, Chongqing 402360, China

3. School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China

4. Chongqing Railway Investment Group Co. Ltd., Chongqing 400023, China

Abstract

Coral sand is widely distributed in coastal areas and used as a soil foundation in an increasing number of projects. Historical records show that the liquefaction and lateral spreading of coral sand foundations occurred many times during earthquakes, resulting in serious geological and engineering disasters. Based on a rigid drainage pile, a PCC pile (Large Diameter Pipe Pile by using Cast-in-place Concrete) and drainage body are innovatively combined into a new drainage PCC pile, to reduce the harm caused by liquefaction and lateral spreading of the coral sand foundation. In this study, the seismic response of the subgrade-embankment-seawall system on the coral sand liquefaction site was simulated using a shaking table. The excess pore water pressure ratio, acceleration, average foundation settlement, seawall displacement, embankment deformation, and pile body bending moment of the ordinary pile foundation and new drainage PCC pile foundation under seismic loads of PGA peak ground acceleration = 0.05 g , PGA = 0.1 g , and PGA = 0.2 g on the coral sand site were analyzed and compared. Compared with ordinary pile foundations, the excess pore water pressure ratio, pile bending moment, seawall displacement, foundation settlement, and embankment deformation of the new drainage PCC pile foundation were markedly reduced, while acceleration increased, which showed that the new drainage PCC pile had a positive anti-liquefaction effect on the coral sand foundation.

Funder

Natural Science Foundation of Chongqing

Publisher

Hindawi Limited

Subject

General Earth and Planetary Sciences

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