大断面矩形盾构隧道横断面地震响应分析  

Analysis on Cross-section Seismic Response of Large-section Rectangular Shield Tunnel

作　　者：王治坤 孙巍 官林星 禹海涛[3] WANG Zhikun;SUN Wei;GUAN Linxing;YU Haitao

机构地区：[1]同济大学,上海市200092 [2]上海市政工程设计研究总院(集团)有限公司,上海市200092 [3]同济大学岩土及地下工程教育部重点实验室,上海市200092

出　　处：《城市道桥与防洪》2024年第10期271-275,M0025,共6页Urban Roads Bridges & Flood Control

摘　　要：研究大断面矩形盾构隧道的地震响应特性,以上海虹桥临空地下连接通道工程为例,建立大断面矩形盾构隧道横断面抗震计算的动力时程有限元分析模型。数值模型考虑了上海软土的动力特性和衬砌管片接头,合理模拟了场地土-矩形隧道结构的动力相互作用。通过建立均质刚度管片模型,对比分析了管片接头对矩形隧道动力响应的影响,并进一步探讨了管片接头旋转刚度变化对层间位移和结构内力的影响规律。结果表明:地震作用下均质刚度模型与管片接头模型的动力响应差异较大,与管片接头模型相比,均质刚度模型无法表现出接头位置处管片错位和内力突变,且峰值弯矩和轴力值也明显放大,其中弯矩峰值放大高达2.29倍,建议矩形抗震设计时采用管片接头模型;管片接头转动刚度对矩形隧道动力响应影响显著,随着接头刚度降低,结构层间位移逐渐增加,但管片峰值弯矩和剪力显著减小。研究可为大断面矩形盾构隧道的抗震设计提供科学依据。To study the seismic response characteristics of large-section rectangular shield tunnel,a dynamic time-history finite element analysis model for seismic computations of the cross section of large-section rectangular shield tunnel is established by taking the Shanghai Hongqiao Underground Connection Channel Project as a case study.The numerical model accounts for the dynamic characteristics of soft soil in Shanghai and the joints of lining segments.The dynamic interaction between the site soil and the rectangular tunnel structure is reasonably simulated.By establishing a homogeneous rigidity segment model,the influence of segment joints on the dynamic response of the rectangular tunnel is compared and analyzed,and the influencing rule of segment joint rotary rigidity change on the interlayer displacements and internal structural forces are further discussed.The results show that the dynamic response of the homogeneous rigidity model is greater than that of the segment joint model.Compared with the segment joint model,the homogeneous rigidity model is hard to show up the segment dislocation and the internal force mutation at the joint places.Furthermore,the peak bending moment and axial force value are obviously increased,in which the peak of bending moment is increased up to 2.29 times.It is suggested to adopt the segment joint model in the rectangular seismic design.The influence of the rotational rigidity of segment joint on the dynamic response of rectangular tunnel is obvious.With the joint rigidity decreases,the structural interlayer displacement gradually increases,but the peak bending moment and shearing force of the segments significantly reduce,which can provide a scientific basis for the seismic design of large-section rectangular shield tunnels.

关 键 词：大断面矩形隧道 时程分析法 管片接头 地震响应分析 结构内力 

分 类 号：TU435[建筑科学—岩土工程]