期刊论文

中文

岩土力学

1000-7598

2022

43

9

2602-2614

10.16285/j.rsm.2021.1962

国家自然科学基金资助项目(No.51878671) 上海铁路局科研计划项目(No.2013144)。

本校为其他机构

基于一维固结-蠕变试验,综合考虑软土主固结效应和蠕变效应,选择一维Koppejan模型刻画软土变形的时效特性,并将该模型以增量形式扩展至三维应力空间,基于ABAQUS平台开发相应的材料模型子程序。将该子程序应用于以桩基-堆载现场试验为原型的桩-土耦合作用数值分析,研究长期堆载条件下桩身响应、桩侧附加压力及桩间土拱效应的时效性变化规律,揭示被动桩-软土时效性相互作用机制。结果表明:堆载引发的桩侧附加荷载主要分布在相对软弱土层范围,并随着堆载时间的延长而增大,但其分布范围基本不变;随着堆载时间延长,被动桩段桩间软土的塑性区持续增大,主应力拱拱高持续减小,土拱效应持续弱化,土拱效应...

Based on one-dimensional consolidation-creep tests,comprehensively considering primary consolidation and creep effects,the one-dimensional Koppejan model was selected to characterize the time-dependent deformation of soft soils,and the model was extended to the three-dimensional stress space in incremental form,and the corresponding material subroutine was implemented in ABAQUS software.The subroutine was then applied to a numerical analysis considering pile-soil coupled interactions based on a field prototype test.The time-dependent variations of pile response,additional pressure acting on th...