基于薄壁圆柱壳理论的盾构隧道抗震拟静力分析法

发布时间：2018-08-02 09:31

【摘要】：为简化盾构隧道抗震分析,在获得深埋盾构隧道周边自由场剪应变和剪应力的基础上,基于弹性薄壁圆柱壳理论,给出了求解深埋盾构隧道水平地震剪切波作用下的附加内力计算公式,并与同等条件等效刚度数值分析方法结果进行了对比。研究表明:滑移和不滑移条件下的拟静力计算结果与相应的数值分析结果具有良好的一致性,说明基于弹性薄壁圆柱壳理论获得的盾构隧道拟静力公式具有良好的合理性。研究还表明:水平地震剪切波作用下,可滑移条件下的附加弯矩和附加剪力分别大于不滑移条件下的附加弯矩和附加剪力,可滑移条件下的附加轴力小于不滑移条件下的附加轴力;附加弯矩和附加轴力呈现反对称分布特性,其最大值通常分布在45°和225°雷达对称轴或135°和315°雷达对称轴上,附加剪力最大值一般分布在0°和180°雷达对称轴上。研究结论对盾构隧道工程抗震设计具有一定的参考价值。
[Abstract]:In order to simplify the seismic analysis of shield tunnel, based on the theory of elastic thin-walled cylindrical shell, the shear strain and shear stress of free field around the deep buried shield tunnel are obtained. The formula for calculating the additional internal force under the action of horizontal seismic shear wave of deep buried shield tunnel is given, and the results are compared with the results of numerical analysis of equivalent stiffness under the same conditions. The results show that the quasi-static calculation results are in good agreement with the corresponding numerical results under the conditions of slip and non-slip. It is shown that the quasi-static formula of shield tunnel based on the elastic thin-walled cylindrical shell theory is reasonable. The results also show that the additional moment and shear force under the sliding condition are larger than those under the condition of non-slip, respectively, under the horizontal seismic shear wave, the additional moment and the additional shear force under the sliding condition are larger than the additional moment and the additional shear force under the condition of non-slip respectively. The additional axial force under sliding condition is smaller than that under non-slip condition, and the additional bending moment and additional axial force show antisymmetric distribution characteristics. The maximum values of the additional axial force are usually distributed on 45 掳and 225 掳radar symmetry axes or 135 掳and 315 掳radar symmetry axes. The maximum value of additional shear force is generally distributed on the symmetry axis of 0 掳and 180 掳radar. The research results have certain reference value for shield tunnel seismic design.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;
【基金】：教育部新世纪人才资助项目(NCET-11-0713) 国家科技支撑计划课题(2013BAB10B04) 国家自然科学基金项目(51178400,U1134208)
【分类号】：U455.43;U452.28

【相似文献】