地铁循环荷载作用下上海软土地基长期沉降计算Long-term settlement of soft soil foundation under metro cyclic loading in Shanghai
高广运;陈娟;梁婷;
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
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;
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DOI:
参考文献(References):
- [1]叶耀东,朱合华,王如路.软土地铁运营隧道病害现状及成因分析[J].地下空间与工程学报,2007,3(1):157-160.YE Yaodong,ZHU Hehua,WANG Rulu.Analysis on the current status of metro operating tunnel damage in soft ground and its causes[J].Chinese Journal of Underground Space and Engineering,2007,3(1):157-160.(in Chinese)
- [2]黄茂松,李进军,李兴照.饱和软粘土的不排水循环累积变形特性[J].岩土工程学报,2006,28(7):891-895.HUANG Maosong,LI Jinjun,LI Xingzhao.Cumulative deformation behavior of soft clay in cyclic undrained tests[J].Chinese Journal of Geotechnical Engineering,2006,28(7):891-895.(in Chinese)
- [3]殷杰.结构性软黏土的修正剑桥模型[J].工程力学,2013,30(1):190-197.YIN Jie.A modified cam clay model for saturated soft clays[J].Engineering Mechanics,2013,30(1):190-197.(in Chinese)
- [4]姚兆明,张明慧,陈军浩.饱和软黏土循环累积孔压模型及地铁隧道路基长期沉降计算[J].铁道学报,2012,34(9):87-92.YAO Zhaoming,ZHANG Minghui,CHEN Junhao.Cyclic accumulation pore pressure explicit model of saturated soft clay and long-term settlement calculation of subway tunnel roadbed[J].Journal of the China Railway Society,2012,34(9):87-92.(in Chinese)
- [5]李进军,黄茂松,王育德.交通荷载作用下软土地基累积塑性变形分析[J].中国公路学报,2006,19(1):1-5.LI Jinjun,HUANG Maosong,WANG Yude.2006.Analysis of cumulative plastic deformation of soft clay foundation under traffic loading[J].China Journal of Highway and Transport,2006,19(1):1-5.(in Chinese)
- [6]曾二贤.交通动荷载引起的软土地基长期沉降[D].杭州:浙江大学,2008.ZENG Erxian.Long-term settlement of soft soil ground induced by traffic loadings[D].Hangzhou:Zhejiang University,2008.(in Chinese)
- [7]孙波.交通荷载作用下软土地基的动力响应和长期沉降研究[D].杭州:浙江大学,2013.SUN Bo.Dynamic response and long-term settlement of soft foundation under traffic load[D].Hangzhou:Zhejiang University,2013.(in Chinese)
- [8]吴世明.土动力学[M].北京:中国建筑工业出版社,2002:94-102.WU Shiming.Soil dynamics[M].Beijing:China Construction Industry Press,2002:94-102.(in Chinese)
- [9]黄茂松,姚兆明.循环荷载下饱和软黏土的累积变形显式模型[J].岩土工程学报,2011,33(3):325-331.HUANG Maosong,YAO Zhaoming.Explicit model for cumulative strain of saturated clay subjected to cyclic loading[J].Chinese Journal of Geotechnical Engineering,2011,33(3):325-331.(in Chinese)
- [10]高广运,梁婷,林健,等.地铁荷载作用下软土地基长期沉降的有限元分析[J].工程地质学报.2016,24(S1):889-895.GAO Guangyun,LIANG Ting,LIN Jian,et al.FEM analysis of long-term settlement of soft soil caused by metro loading[J].Journal of Engineering Geology,2016,24(S1):889-895.(in Chinese)
- [11]叶耀东.软土地区运营地铁盾构隧道结构变形及健康诊断方法研究[D].上海:同济大学,2007.YE Yaodong.Reserch on deformation and method of health diagnose of operational subway structures in soft soil[D].Shanghai:Tongji University,2007.(in Chinese)
- [12]费康,张建伟.ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2010:158-167.FEI Kang,ZHANG Jianwei.ABAQUS application in geotechnical engineering[M].Beijing:China Water Power Press,2010:158-167.(in Chinese)
- [13]GB 50157—2013.地铁设计规范[S].GB 50157—2013.Code for design of metro[S].(in Chinese)
- [14]陈文红,李韬,申永勇,等.上海国产化A型地铁列车[J].机车电传动,2008(5):35-41.CHEN Wenhong,LI Tao,SHEN Yongyong,et al.Localized type A metro train of Shanghai[J].Electric Drive for Locomotives,2008(5):35-41.(in Chinese)
- [15]梁波,罗红,孙常新.高速铁路振动荷载的模拟研究[J].铁道学报,2006,28(4):89-94.LIANG Bo,LUO Hong,SUN Changxin.Simulated study on vibration load of high speed railway[J].Journal of the China Railway Society,2006,28(4):89-94.(in Chinese)
- [16]刘添俊,莫海鸿.长期循环荷载作用下饱和软黏土的应变速率[J].华南理工大学学报(自然科学版),2008,36(10):37-42.LIU Tianjun,MO Haihong.Strain rate of saturated soft clay under long-term cyclic loading[J].Journal of South China University of Technology(Natural Science Edition),2008,36(10):37-42.(in Chinese)