【摘要】 过江盾构隧道选线过程中因避让不良地质段，或地形上满足两端进洞及展线要求而常产生局部弯曲，如苏州市海太过江盾构隧道。而隧道曲率对其动力响应影响规律在现有研究中鲜有提及，为探究在动力条件下不同曲率的盾构隧道纵向方向管环的轴力、张开量等变化规律，运用纵向反应位移法思想，基于长大隧道非一致激励动力分析方法，建立多质点-梁-弹簧模型，开展多工况地震动输入下的不同曲率盾构隧道纵向动力响应分析。结果表明：数值模型与计算方法能够得到合理的隧道结构动力响应；盾构隧道动力响应随隧道曲率增加而增加；不同曲率盾构隧道在进入土层交界区段其轴力和张开量出现显著的差异。该研究结果可为盾构隧道选线论证及动力响应分析提供更为可靠完善的计算模型与设计依据。更多还原

【Abstract】 During the route selection process of river crossing shield tunnels, local bending often occurs due to avoiding unfavorable geological sections or terrain that meets the requirements for tunnel entry and extension at both ends, such as the Suzhou Haitai River Crossing Shield Tunnel. However, the influence of tunnel curvature on its dynamic response is rarely mentioned in existing research.In order to explore the changes in the internal force, tension, displacement, and other changes of the longitudinal direction pipe ring of shield tunnels with different curvatures under dynamic conditions, the longitudinal response displacement method is used. Based on the dynamic analysis method of long tunnel soil non-uniform excitation seismic response simulation, a multi particle beam spring model is established, Conduct longitudinal dynamic response analysis of shield tunnels with different curvature under multiple seismic input conditions. The calculation results indicate that the numerical model and calculation method can obtain a reasonable dynamic response of the tunnel structure; The dynamic response of shield tunnel increases with the increase of tunnel curvature;There are significant differences in the dynamic response of shield tunnels with different curvature when entering the soil boundary section. The research results can provide a more reliable and comprehensive calculation model and design basis for shield tunnel route selection and dynamic response analysis.更多还原