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土—地下结构非线性动力相互作用及其大型振动台试验研究 【作者】庄海洋 【导师】陈…

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土—地下结构非线性动力相互作用及其大型振动台试验研究

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#q mR!x` g9h0【作者】庄海洋导师】陈国兴; 程绍革水利论文k'b'E*jx?LA
【作者基本信息】南京工业大学,岩土工程,2006年,博士

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【中文摘要】 地铁地下结构建设是未来解决城市交通拥挤问题的主要方法,已有的震害表明,地铁地下结构一旦遭受地震破坏,将会给地震应急和震后修复工作带来极大的困难,出于城市防灾减灾的要求,对城市地铁地下结构的抗震性能及其抗震设计方法的研究越来越受到人们的重视。由于地铁地下结构完全埋于土中,在强地震发生时,土体的大变形是导致地铁地下结构破坏的主要因素,因此,土体的非线性动力特性和土-地下结构非线性动力相互作用是研究该问题的主要研究内容。本文的研究旨在通过对南京及其邻近地区新近沉积土的动力特性及其非线性地震反应进行分析,在此研究基础上进行深厚软弱场地上土-地铁地下结构非线性动力相互作用的数值模拟和大型振动台模型试验,探索地铁地下结构的震害成灾机理及其非线性地震反应规律,为地铁地下结构的优化设计和简化抗震计算方法提供合理的建议和可靠的指导。论文的主要工作如下:1.基于抛物线内插法,推导了计算反应谱的连锁计算公式,通过与常用的精确法和解析方法的计算结果对比分析,验证了该反应谱的计算方法有比精确法更高的计算精度;2.对南京及其邻近地区新近沉积土的动力参数进行了试验研究,给出了新近沉积土的动剪切模量比和阻尼比与剪应变...更多幅的关系,同时,给出了新近沉积土的最大剪切模量的经验计算公式,在此基础上建立了土体的非线性粘弹性动力本构模型和基于广义塑性力学的记忆型多屈服面的粘塑性动力本构模型及其模型算法;3.开发了分层成层场地非线性地震反应的时域分析程序和基于ABAQUS软件的土体非线性动力本构关系的子程序,采用不同的土体动力本构模型,对比分析了含有新近沉积土的深厚软弱场地非线性地震反应规律,验证了本文建立的土体非线性动力本构模型和开发的场地时域非线性分析程序的可行性;4.基于ABAQUS软件,研究了土-地下结构非线性动力相互作用的有限元建模方法、计算方法及其关键问题的处理技术,探索了1995年日本阪神地震中大开地铁车站震害的成灾机理,合理地解释了大开地铁车站的主要震害机理,同时,通过该算例也验证了本文中建立的土-地下结构非线性动力相互作用分析模型和计算方法的可靠性;5.基于本文建立的土-地下结构非线性动力相互作用的分析模型和计算方法,研究了深厚软弱场地上地铁区间隧道和地铁车站结构的非线性地震反应规  还原

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【英文摘要】 Building of metro is main method to solve the congestion of city. The previous seismic damages of metro prove that restoration of it is very difficult as soon as it is damaged by earthquake. As far as urban earthquake disaster reduction planning are concerned, study on the earthquake resistant behavior of metro and its seismic design method are regarded more and more by people. For metro structure is embedded in soil, large deformation of soil is the major factor causing the severe damage of metro structure. Accordingly, study on the nonlinear dynamic characteristics of soil and the nonlinear dynamic soil-metro structure interaction are important.Firstly, the dynamic characteristics of recently deposited soils in area of Nanjing and its neighbor are studied and the nonlinear earthquake response of thick soft site is analyzed in this paper. Secondly, the nonlinear dynamic soil-metro structure interaction in thick soft site is analyzed by finite-element method to look-up its mechanics of...更多 damage and regularity of earthquake response. At last, the nonlinear dynamic soil-metro structure interaction is studied by shaking table tests. The dynamic responses of tunnel and subway station in liquable soil are surveyed respectively. These studies can be used to guide the seismic design of metro. The major studies are as follows:1. Based on the parabolic interpolation method, the chain formulas used to calculate the spectrum are deduced in detail. By comparing to those results calculated by precision method and analytic method, it proves that these results calculated by chain formulas are more precise than those results calculated by precision method. 2. The dynamic characteristics of recently deposited soils in area of Nanjing and its neighbor are studied. Referenced values of parameters used to fit the relationships of shear modulus ratio and damping ratio versus shear strain by new method are given.At the same time, the experiential formulas used to fit the relationship of maximal shear modulus versus confining pressure are also given in paper. Based on the Davidenkov stress-strain skeleton curves of soil, a new nonlinear viscous-elastic constitutive model of soil is constructed and its parameters are studied in detail. Based on the principles of geotechnical plastic mechanics, a viscous-plastic memorial nested yield surface model of soil is constructed.3. A new program used to calculate the nonlinear earthquake response of  还原

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【中文关键词】 土的非线性动力特性; 土-地下结构动力相互作用; 振动台模型试验; 非线性地震反应; 地铁区间隧道; 地铁车站水利论文)P Yx:Xa;m0fPb
【英文关键词】 Nonlinear characteristics of soil; Dynamic soil-underground structure interaction; Shaking table test; Nonlinear earthquake response; Metro tunnel; Subway station
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