首页|Time-dependent deviation of bridge pile foundations caused by adjacent large-area surcharge loads in soft soils and its preventive measures

Time-dependent deviation of bridge pile foundations caused by adjacent large-area surcharge loads in soft soils and its preventive measures

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Time-dependent characteristics(TDCs)have been neglected in most previous studies investigating the deviation mechanisms of bridge pile foundations and evaluating the effectiveness of preventive measures.In this study,the stress-strain-time characteristics of soft soils were illustrated by consolidation-creep tests based on a typical engineering case.An extended Koppejan model was developed and then embedded in a finite element(FE)model via a user-material subroutine(UMAT).Based on the validated FE model,the time-dependent deformation mechanism of the pile foundation was revealed,and the preventive effect of applying micropiles and stress-release holes to control the deviation was investigated.The results show that the calculated maximum lateral displacement of the cap differs from the measured one by 6.5%,indicating that the derived extended Koppejan model reproduced the deviation process of the bridge cap-pile foundation with time.The additional load acting on the pile side caused by soil lateral deformation was mainly concentrated within the soft soil layer and increased with the increase in load duration.Compared with t=3d(where t is surcharge time),the maximum lateral additional pressure acting on Pile 2#increased by approximately 47.0%at t=224 d.For bridge pile foundation deviation in deep soft soils,stress-release holes can provide better prevention compared to micropiles and are therefore recommended.

bridge pile foundationsurcharge loadsoft soiltime-dependent deformationinteraction mechanismpreventive measure

Shuanglong LI、Limin WEI、Jingtai NIU、Zhiping DENG、Bangbin WU、Wuwen QIAN、Feifei HE

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School of Hydraulic Engineering,Nanchang Institute of Technology,Nanchang 330099,China

School of Civil Engineering,Central South University,Changsha 410075,China

Science and Technology Research Project of Jiangxi Education DepartmentScience and Technology Research Project of Jiangxi Education DepartmentNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangxi ProvinceYoung Scientific and Technological Talents Sponsorship Project in Ganpo Juncai Support Program

GJJ2201509GJJ220150151878671519690185237834420224BAB2040762023QT08

2024

10.1007/s11709-024-1047-5

结构与土木工程前沿
高等教育出版社

结构与土木工程前沿

CSTPCDEI
影响因子：0.082
ISSN：2095-2430
年,卷(期)：2024.(2)
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