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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。
In order to simplify the seismic analysis of shield tunnels, based on the theory of elastic thin-walled cylindrical shells, the horizontal shear wave shear stress of deep shield tunnel is obtained based on the free-field shear strain and shear stress around the deep shield tunnel. The formula of additional internal force is compared with that of the equivalent condition equivalent stiffness numerical analysis method. The results show that the results of pseudo-static under slip and non-slip conditions are in good agreement with the corresponding numerical results, which shows that the quasi-static formula of shield tunnel obtained based on the elastic thin-walled cylindrical shell theory is reasonable Sex. The research also shows that under the action of horizontal shear wave, the additional bending moment and additional shear force under the slippery condition are larger than the additional bending moment and the additional shear force respectively under the non-slip condition, while the additional axial force under the slippery condition Which is less than the additional axial force under non-slip condition. The additional bending moment and additional axial force show anti-symmetrical distribution. The maximum value is usually distributed on the symmetry axes of 45 ° and 225 ° radar or 135 ° and 315 ° radar. The maximum shear force is generally distributed on the 0 ° and 180 ° radar axis of symmetry. The conclusion of the study is of certain reference value to the seismic design of shield tunneling project.