考虑成层土体的地铁隧道地震动力响应分析

考虑了土体的粘弹性,采用非均质土-结的计算模型,结合动力学理论,分析了结构的本构模型、人工边界条件以及土-结的接触问题,主要探讨了地震作用下地铁隧道的动力响应特征。依托实际工程,在ANSYS中建立数值模型并输入实际材料参数,施加粘弹性人工边界,参考武汉地区抗震设防的要求,垂直入射天津波。通过该模型的模态分析、时程分析表明：结构在地震作用下的响应与衬砌混凝土等级、衬砌厚度有关,并且土体加固后对结构抗震性能有很大影响。最后,对衬砌在地震作用下的安全性进行了分析,为地铁隧道的抗震设计提供了依据。

Analysis for Seismic Dynamic Response of Subway Tunnel with the Consideration of Layered Soil

Based on theory of visco-elasticity and dynamics, using the computation model of heterogeneity soil-structure, this paper analyses the constitutive model, artificial boundary conditions and the contact problem of soil-structure, and mainly discusses the dynamic response characteristics of the tunnel under the action of seismic. Based on practical engineering projects, building numerical model and inputting practical material parameters in the ANSYS, adding visco-elasticity artificial boundary, and referring to the code requirement for seismic design of buildings in Wuhan, Tianjin wave is perpendicular to the incident plane. The numerical results show that： the response of the structure under the action of seismic related to the concrete grade and thickness of the lining, and the reinforced soil has a great influence on the anti-seismic performance of the structure. At last, this paper analyses the safety of the lining under the action of seismic, which provides the basis for the anti-seismic design of subway tunnel.