|Table of Contents|

Centrifuge model test study on effectiveness of precast pipe pile reinforcement in soft soil embankments for highway widening and reconstruction projects(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年06期
Page:
158-166
Research Field:
岩土工程
Publishing date:

Info

Title:
Centrifuge model test study on effectiveness of precast pipe pile reinforcement in soft soil embankments for highway widening and reconstruction projects
Author(s):
ZHANG Zimeng1; 2; 3;  YU Chunjiang4;  LI Tao4;  ZHANG Dingwen1; 2; 3;  GUO Yinhe1; 2; 3
(1. School of Transportation, Southeast University, Nanjing 211189, Jiangsu, China; 2. Key Laboratory of Transport Industry of Comprehensive Transportation Theory(Nanjing Modern Multimodal Transportation Laboratory)of Ministry of Transport, Nanjing 211100, Jiangsu, China; 3. Key Laboratory of Low-carbon and Green Geotechnical Engineering of Jiangsu Province, Southeast University, Nanjing 211189, Jiangsu, China; 4. Anhui Transportation Holding Group Co., Ltd., Hefei 230092, Anhui, China)
Keywords:
widening embankment;  precast pipe pile;  centrifuge model test;  settlement prediction;  deformation coordination
PACS:
U416.14
DOI:
10.19815/j.jace.2024.10050
Abstract:
In order to reveal the effect of precast pipe pile treatment and the coordination of deformation between new and old embankments in the widening and reconstruction project of highways in soft soil areas, relying on Wuhe Expressway widening and reconstruction project, the geotechnical centrifuge model test method was used to study the deformation characteristics of the foundation under the load of new and old embankments. The additional impact of new road widening on the existing old embankment was analyzed, and the deformation coordination control effect of precast pipe piles on the new and old embankments was evaluated by combining settlement prediction. The results show that for the widening and reconstruction project of Wuhe Expressway, using precast pipe piles to treat the soft foundation under the widened embankment can control the post construction settlement of the old road caused by the widened embankment as an additional load within 5 cm. The total settlement of the new road after widening the roadbed treatment is less than 15 cm, and the post construction settlement is less than 5 cm. The differential settlement between the new and old roadbeds is effectively controlled. Due to the stress concentration effect of precast pipe piles in treating the foundation, the additional load on the widened embankment borne by the soil between the piles is significantly reduced, which is manifested macroscopically as accelerating the consolidation rate of the foundation and reducing post construction settlement. The research results can provide a basis for the design and construction of precast pipe pile reinforcement technology for highway widening and reconstruction projects in soft soil areas.

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Last Update: 2025-11-25