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Experimental Research on the Transverse Effective Bending Rigidity of Shield Tunnels

机译：屏蔽隧道横向有效弯曲刚度的实验研究

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摘要

The uniform rigidity ring model is commonly used to design the segmented structures of shield tunnels. However, model tests have been primarily used to study the transverse effective rigidity ratio eta with a concentrated force, which is notably different from realistic loading patterns. To obtain more reasonable eta values, in this study, tests were performed with a concentrated load on an experimental bench and with a realistic loading pattern in sandy soil in a rigid steel tank. Three types of segmental ring models were designed and tested: straight-jointed, stagger-jointed, and uniform rings. The test results indicated that the eta values of the stagger-jointed assembly mode were clearly larger than those of the straight-jointed assembly mode under both loading patterns. eta increased as the load increased under the realistic loading conditions, whereas eta decreased as the load increased under the concentrated load. More importantly, the eta values derived from the realistic load tests were considerably larger than those derived from the concentrated load tests for both assembly modes (i.e., 0.423-0.672 and 0.587-0.761 for the straight-jointed and stagger-jointed assembly modes, respectively), and the former should be recommended for practical engineering applications. Furthermore, formulas relating eta to the ratio of the cover depth to the tunnel diameter were proposed for sandy soil.
机译：均匀的刚性环模型通常用于设计屏蔽隧道的分段结构。然而，模型测试主要用于研究具有浓缩力的横向有效刚度ETA，其与现实的装载图案不同。为了获得更合理的ETA值，在该研究中，用实验台上的浓缩载荷进行测试，并在刚性钢罐中具有砂土的逼真装载模式。设计和测试三种类型的节段型号：直接连接，交错和均匀的环。测试结果表明，交错连接组件模式的ETA值明显大于在装载模式下的直接组装模式的ETA值。由于负荷在现实的装载条件下增加，ETA增加，而ETA随着浓缩负荷的负载增加而降低。更重要的是，源自现实载荷试验的ETA值远远大大大于源自组装模式（即，0.423-0.672和0.587-0.761的集中负载试验，分别用于直接连接和交错的装配模式），前者应该推荐用于实际工程应用。此外，提出了与覆盖深度与隧道直径的比率相关的公式用于砂土。

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  • 来源
    《Advances in civil engineering》 |2019年第14期|2174562.1-2174562.17|共17页
  • 作者

    Zheng Gang; Lei Yawei; Cui Tao; Cheng Xuesong; Diao Yu; Zhang Tianqi; Sun Jibin;

  • 作者单位

    Tianjin Univ MOE Key Lab Coast Civil Struct Safety Tianjin 300072 Peoples R China|Tianjin Univ Dept Civil Engn Tianjin 300072 Peoples R China;

    Tianjin Univ Dept Civil Engn Tianjin 300072 Peoples R China;

    Tianjin Univ Dept Civil Engn Tianjin 300072 Peoples R China|China Railway Design Corp Tianjin 300142 Peoples R China;

    Tianjin Univ MOE Key Lab Coast Civil Struct Safety Tianjin 300072 Peoples R China|Tianjin Univ Dept Civil Engn Tianjin 300072 Peoples R China;

    Tianjin Univ MOE Key Lab Coast Civil Struct Safety Tianjin 300072 Peoples R China|Tianjin Univ Dept Civil Engn Tianjin 300072 Peoples R China;

    Tianjin Univ MOE Key Lab Coast Civil Struct Safety Tianjin 300072 Peoples R China|Tianjin Univ Dept Civil Engn Tianjin 300072 Peoples R China;

    Tianjin Univ Dept Civil Engn Tianjin 300072 Peoples R China;

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