Analysis of Interaction between Pile Foundation and Reinforced Earth Embankment under Surcharge Loading Considering Time-Effect Characteristics

DOI: https://doi.org/10.62517/jcte.202406312

Author(s)

Minghui Pan1, Qiguang Wang1, Shan Jiang1, Liangdong Zuo2,3,4,*

Affiliation(s)

1Chongqing Engineering Corporation Limited of Power China, Chongqing, China 2Institute of Aeronautics and Astronautics, Shanghai Jiaotong University, Shanghai, China 3Chongqing Nearspace innovation R&D center, Shanghai Jiaotong University, Chongqing, China 4Chongqing College of Architecture and Technology, Chongqing, China *Corresponding Author.

Abstract

For the bridge pile foundation built on the embankment filled with reinforced earth, the timely lateral deformation of the fill induced by the stacking load on the embankment can exert additional load on the pile side. The longer the stacking time, the greater the effect of the additional load, which leads to the additional deformation and internal force of the pile body, and further reduces the service performance of the pile foundation. Based on the pile foundation in the filling area of a section of Chengnan Expressway in Chongqing, a 1: 20 model test of pile-foundation was carried out indoors to monitor the distribution and variation of pile response, lateral earth pressure on pile side and horizontal displacement of embankment soil under different loading conditions. At the same time, based on the finite element calculation platform ABAQUS, a numerical model with the same parameters as the model test is established to simulate the change law of the above parameters under long-term surcharge, clarify the weakening mechanism of the soil arching effect between piles caused by the timely lateral deformation of reinforced soil embankment, and reveal the interaction mechanism of lateral reinforced soil and pile foundation. On this basis, the effects of stacking distance, stacking strength, relative soft soil thickness and pile-soil relative stiffness ratio on the response time of pile foundation are compared and analyzed.

Keywords

Prescription Characteristics; Loading Action; Pile Foundation; Reinforced Earth Embankment; Interaction

References

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