Time-dependent Response of Adjacent Bridge Pile Foundations Induced by Excavation in Soft Clay

被引：0
|
作者：
Ying H. [1 ,2 ]
Xiong Y. [1 ]
Lü W. [1 ]
Cheng K. [3 ]
Liu G. [4 ]
Du W. [5 ]
机构：
[1] Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing
[2] Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou
[3] China Railway 11th Bureau Group Co. ，Ltd., Wuhan
[4] Zhejiang Province Institute of Architectural Design and Research, Wenzhou
[5] Hangzhou Railway Design Institute Co. ，Ltd., Hangzhou
来源：
Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences | 2024年 / 51卷 / 01期
基金：
中国国家自然科学基金;
关键词：
excavation; load-transfer method; pile foundations; time-dependent analysis;
D O I：
10.16339/j.cnki.hdxbzkb.2024003
中图分类号：
学科分类号：
摘要：
PLAXIS 3D software and soft soil creep model were used to establish a 3D numerical model of the excavation of a municipal road underneath an elevated bridge. The rationality of the model was verified by comparing with the measured data. The soft soil creep model was simplified into the soft soil model，and the time-dependent horizontal response of the bridge pile group was compared，taking into account the constraint condition at the pile top. The two-stage method was used to incorporate the time-dependent settlement of the soil in the free field obtained through numerical calculation as the“external load”acting on the pile foundation. The load-transfer method，which accounts for the reciprocating shear between the pile and soil，was employed to calculate the vertical mechanical response of the pile foundation under the influence of self-weight，pile top load，and excavation of the adjacent foundation pit. The results indicate that：1）Soil creep significantly impacts the deformation and internal force of adjacent bridge pile group，and its effect can be comparable to the influence of instantaneous deformation of the wall. 2）The deformation and internal force of bridge pile exhibit a negative correlation with the distance between the pile and the foundation pit，highlighting the curtain effect of pile group. The deformation and internal force at the pile top are governed by the constraint condition at the pile top. 3）Reasonable pile diameter and length exist for bridge pile foundations in deep soft strata where both the load on the pile top and disturbance from adjacent foundation pit excavation are minimal，when the deformation of the pile top is used as the control target. © 2024 Hunan University. All rights reserved.
引用
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页码：24 / 32
页数：8
相关论文
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