浅覆土下穿铁路大跨度箱涵顶进施工工艺关键参数优化

发布时间：2018-04-14 15:08

本文选题：下穿铁路 + 框架桥盾构法　；参考：《华东交通大学》2016年硕士论文

【摘要】：框架桥盾构法箱涵顶进施工技术已经在工程中得到了广泛应用,而其施工工艺研究尚且不足,缺乏对施工关键参数的分析优化,因此本文结合江西丰城物华路下穿沪昆铁路立交桥项目,采用了模型试验和数值模拟等方式,进行了框架桥盾构箱涵顶进施工方法在浅覆土下穿铁路中的研究。通过试验分析了减阻材料对顶涵施工摩擦系数的影响和工法关键参数与路基表面位移变形的关系,并使用有限元软件ABAQUS对关键参数分析优化。本文主要研究内容和成果如下:1.对混凝土与不同含水量土体之间,混凝土与混凝土之间摩擦系数的变化规律进行了模拟试验分析,结果表明浅覆土下穿大跨度箱涵顶进施工中宜采用石蜡机油混合物作为减阻材料。2.通过模型试验对框架桥盾构法施工过程路基表层土体位移变形进行了研究,分析得出了在相同条件下,不同顶进进尺对路基地表位移变形规律,以及不同顶进受力点位置对千斤顶加载最大顶力的影响。3.通过选取不同顶进进尺和顶进受力点位置,对框架桥盾构工法中涵周土体位移变形及涵身结构受力进行数值模拟计算,分析结果表明:建议选取0.4m顶进进尺及距离底板底部0.8m的顶进受力点位置作为最优施工参数。
[Abstract]:The jacking construction technology of shield culvert with shield method of frame bridge has been widely used in engineering, but the research on its construction technology is still insufficient, and it lacks the analysis and optimization of key construction parameters.In this paper, the method of shield box culvert jacking construction of frame bridge in shallow overlying railway is studied by using model test and numerical simulation combined with the project of Hu-Kun railway interchange under Fuhua Road, Fengcheng, Jiangxi Province.The influence of drag reducing materials on the friction coefficient of jacking culvert construction and the relationship between the key parameters of the engineering method and the displacement and deformation of the subgrade surface are analyzed through experiments. The key parameters are analyzed and optimized by using the finite element software ABAQUS.The main contents and results of this paper are as follows: 1.The variation law of friction coefficient between concrete and soil with different moisture content and between concrete and concrete is simulated and analyzed.The results show that paraffin oil mixture should be used as drag reducing material.In this paper, the displacement and deformation of subgrade surface soil during shield tunneling construction of frame bridge are studied by model test, and the law of displacement and deformation of subgrade surface is obtained under the same conditions.And the influence of the position of different force points on the maximum force of Jack loading. 3.The displacement and deformation of soil around the culvert and the stress of culvert structure in shield construction method of frame bridge are simulated by selecting different points of jacking ruler and jacking force point.The analysis results show that the optimum construction parameters are 0.4m jacking and 0.8m from the bottom of the floor.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U449.5

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