基于时变效应的盾构隧道衬砌结构分析方法的研究

发布时间：2018-08-27 08:48

【摘要】：近几十年来，我国经历了日新月异的变化，很多方面都可以与世界接轨。在经济迅猛发展的大背景下，省时、高效率的地铁运输系统在我国主要城市得到了快速发展。在各种隧道施工方法中，盾构法隧道虽然起步较晚，但其以自身独有的优势在隧道施工中得到广泛应用，与此同时与盾构隧道建设相适应的衬砌结构设计理论也在发展和进步。目前，国内外在盾构衬砌结构设计的研究集中在设计模型的选取和论证方面。但在具体的工程中，影响结构性能的因素多样化使得结构设计者在计算时全面系统的考虑到各种影响因素是不太容易实现的。对于混凝土结构的一大特性—时变效应在各个衬砌计算模型中没有明确的体现。混凝土收缩徐变效应对盾构隧道衬砌结构的影响程度及在设计时如何考虑这种影响亟待系统和深入的研究。本文在荷载-结构法的基础上采用理论分析和数值模拟两种方法，分别对衬砌结构在荷载长期作用下的时变效应进行分析计算，主要内容包括: 1.对国内外衬砌结构设计理论的发展和应用状况进行了归纳和分析，介绍了现阶段在衬砌设计领域研究进展，根据已有的研究成果提出了本文的研究内容和预期成果。 2.基于惯用法和修正惯用法中均质圆环结构模型，结合混凝土收缩徐变计算模型，计算考虑荷载长期作用下混凝土时变效应对均质圆环结构模型中刚度有效率的影响，提出对均质圆环结构考虑时变效应影响的修正分析方法。 3.在上一步研究的基础上，考虑接头的存在对衬砌圆环长期刚度的影响情况，采用连续不均匀模型计算时变效应作用下衬砌结构的变形，并与均质圆环结构模型计算的结果进行对比分析，讨论接头效应对衬砌结构的影响程度。 4.结合具体工程，利用ANSYS有限元软件进行数值模拟计算，，分析时变效应影响下的均质圆环模型和考虑接头的连续非均匀模型的衬砌内力变形值，以此来验证理论结果的可行性。
[Abstract]:In recent decades, China has undergone rapid changes, many aspects can be in line with the world. Under the background of rapid economic development, time-saving and efficient subway transportation system in China's major cities has been developed rapidly. At present, the research of shield tunnel lining structure design at home and abroad is focused on the selection and demonstration of design model. But in specific projects, the factors affecting the structural performance are diversified. It is not easy for a tunnel designer to consider all kinds of influencing factors systematically in the calculation. The time-varying effect, a major characteristic of concrete structure, is not clearly reflected in all lining calculation models. The influence of shrinkage and creep of concrete on the structure of shield tunnel lining and how to consider this effect in design. Based on the load-structure method, the time-varying effect of lining structure under long-term load is analyzed and calculated by means of theoretical analysis and numerical simulation.
1. The development and application of lining structure design theory at home and abroad are summarized and analyzed. The research progress in the field of lining design at present is introduced. Based on the existing research results, the research contents and expected results of this paper are put forward.
2. Based on the homogeneous ring structure model of the conventional method and the modified conventional method, combined with the concrete shrinkage and creep calculation model, the influence of the concrete time-varying effect on the stiffness efficiency of the homogeneous ring structure model considering the long-term load is calculated, and the modified analysis method considering the time-varying effect for the homogeneous ring structure is proposed.
3. On the basis of the previous study, considering the influence of the joint on the long-term stiffness of lining ring, the deformation of lining structure under time-varying effect is calculated by using the continuous inhomogeneous model, and the results are compared with those calculated by the homogeneous ring structure model. The influence of the joint effect on the lining structure is discussed.
4. Combining with the concrete project, the finite element software ANSYS is used to simulate and calculate the deformation value of lining internal force under the influence of time-varying effect and considering the continuous inhomogeneous model of joints, so as to verify the feasibility of the theoretical results.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.4

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