基于梁-非线性弹簧模型的盾构隧道管片环极限变形特征研究

发布时间：2018-08-19 06:54

【摘要】：管片环极限变形特征是盾构隧道结构设计的关键控制指标和结构安全监测的重要依据。已有的接头弯曲加载试验表明,当弯矩较大时,接头变形具有明显的非线性特征。针对上海地铁区间盾构隧道管片环内的无衬垫式接头,建立其力学模型并推导其变形解析式,得到一定轴压作用下接头变形非线性特征的定量化描述,将其与试验数据对比,验证接头力学模型和变形解析式的工程适用性。基于非线性弹簧单元建立管片环梁-非线性弹簧模型,采用有限元方法对考虑外荷载及接头自身性能等因素不确定性的各工况管片环极限变形特征进行计算分析,根据分析结果提出对盾构隧道管片环结构设计及运营期结构安全监测提出建议。
[Abstract]:The limit deformation characteristic of segment ring is the key control index of shield tunnel structure design and the important basis of structural safety monitoring. The bending loading tests show that the joint deformation has obvious nonlinear characteristics when the bending moment is large. In view of the unpadded joint in the segment ring of shield tunnel in Shanghai Metro, the mechanical model and its deformation analytic formula are established, and the quantitative description of the nonlinear deformation characteristics of the joint under certain axial pressure is obtained, and the results are compared with the experimental data. The engineering applicability of the mechanical model and deformation analysis of the joint is verified. Based on the nonlinear spring element, a segment annular beam-nonlinear spring model is established. The finite element method is used to calculate and analyze the ultimate deformation characteristics of the segment ring under various working conditions considering the uncertainty of the external load and the performance of the joint itself. Based on the analysis results, some suggestions are put forward for the design of shield tunnel segment ring structure and structural safety monitoring during operation period.
【作者单位】：同济大学土木工程学院;
【基金】：国家重点基础研究发展计划(1973计划)(2011CB013800)
【分类号】：U455.43

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