高广运;陈娟;梁婷;

• 1:同济大学土木工程学院
• 2:同济大学岩土及地下工程教育部重点实验室

摘要(Abstract)：

为准确预测地铁循环荷载作用下上海软土地基的长期沉降,建立基于边界面本构的ABAQUS轨道-隧道-地基三维有限元模型,分析了首次加载后隧道地基的沉降随土层深度和距隧道中心水平距离的变化规律,以及车速对沉降分布的影响;在此基础上,提取ABAQUS模拟的动应力分布,采用改进的K0固结条件下软黏土塑性累积应变计算公式,结合分层总和与固结理论,预测上海地铁1号线人民广场区段隧道的长期沉降,并与实测结果进行对比。结果表明:首次加载后,不同深度各测点距荷载作用位置越近,沉降轮轨分布越明显,残余沉降越大;随水平距离变化存在振动放大区,在3.5倍隧道直径范围外,残余沉降基本为0。改进的软黏土塑性累积应变模型能够更好反映偏压固结条件下循环加载轴向塑性累积应变的发展规律。但是,因不能考虑周围环境的影响,预测的长期沉降结果接近并略小于实测值。

关键词(KeyWords)： 地铁;软土地基;长期沉降;沉降分布;循环累积塑性应变;上海

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51178342);; 高等学校博士学科点专项科研基金资助项目(20130072110016)

作者(Author): 高广运;陈娟;梁婷;

Email:

DOI:

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