基于ANSYS的桥式盾构受力及变形特征研究

发布时间：2018-05-18 03:41

本文选题：地道桥 + 桥式盾构　；参考：《铁道科学与工程学报》2017年04期

【摘要】：为了得到桥式盾构变形受力规律,结合桥式盾构法施工实际工程,利用ANSYS有限元软件建立考虑盾构实际尺寸的三维框架精细化模型模拟盾构施工过程中变形受力变化规律,将计算结果与现场监测结果对比验证计算模型的合理性。研究结果表明:盾构纵向核心土高度对盾构受力变形影响较大,沿着盾构纵向随着核心土高度的减小,中柱和横梁变形很小,边柱变形较大,依次凸显出弹性地基梁、简支梁及悬臂梁的3种变形特点,其中悬臂情况对盾构受力最不利;盾构尾部边柱承受弯矩比盾构前部边柱要大很多,边柱内侧弯矩明显比外侧弯矩大,实际设计时应根据边柱内侧受力情况确定设计参数。
[Abstract]:In order to obtain the deformation law of the bridge shield, combined with the actual construction of the bridge shield, using the ANSYS finite element software, a three-dimensional frame fine model considering the actual size of shield is established to simulate the deformation force change law during the shield construction. The rationality of the calculation model is verified by comparing the calculation results with the field monitoring results. The results show that the longitudinal core soil height of shield has a great influence on the deformation of shield, along with the decrease of core soil height, the deformation of middle column and beam is very small, and the deformation of side column is larger, which highlights the elastic foundation beam in turn. Three kinds of deformation characteristics of simply supported beam and cantilever beam, in which the cantilever condition is the most disadvantageous to shield force, the moment bearing moment of the side column at the rear end of shield is much larger than that of the front edge column of shield, and the inside moment of side column is obviously larger than that of outside moment. In actual design, the design parameters should be determined according to the stress on the inner side column.
【作者单位】：湖南省交通科学研究院;
【基金】：湖南省科技厅资助项目(2014SK4072) 湖南省交通厅资助项目(201432)
【分类号】：U445.4

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