模型尺寸对地铁隧道动力响应数值分析的影响  

Influence of Model Size on the Dynamic Analysis of Subway Tunnel

作　　者：胡显燕[1,2] 朱宏平[1] 王丹生[1] 宋金强[2] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]湖北第二师范学院建材系,湖北武汉430205

出　　处：《土木工程与管理学报》2014年第1期1-6,共6页Journal of Civil Engineering and Management

基　　金：国家重点基础研究发展计划(2011CB013800);湖北省教育厅重点科研项目(D20133003);湖北第二师范学院科研团队建设项目(2012k303)

摘　　要：以上海地铁为背景,分析运营期间隧道衬砌结构的状态。结合有限元法,选用实体单元模拟隧道衬砌结构和土体,仿真分析运营状态下的隧道衬砌结构,通过Newmark积分算法分析其动力响应,并比较不同尺寸模型的计算结果。结果表明,列车荷载作用下,隧道衬砌结构在竖向的动力响应最大,沿列车行驶方向的动力响应最小,横向加速度响应和列车运行位置有关。通过几种模型尺寸分析,衬砌结构在深度的变形量最大,但是宽度方向和长度方向的变形量在实际工程中不可忽视。模型尺寸的深度变化对其动力响应和变形影响明显,模型深度尺寸增加,变形量先增大后减小,而宽度变化的影响相对较小。通过数值模拟可为工程结构的监测分析提供理论依据,为计算模型的选择提供参考。Regarding Shanghai metro as background,tunnel lining structures during metro operation were analyzed.The entity unit was used to model tunnel lining structure and soil with the theory of finite element method,so the tunnel lining during metro operation was simulated.The dynamic responses of the lining were analyzed through Newmark algorithm,and the calculation results of different size of models were compared.It is shown that vertical responses of tunnel lining are maxima and longitudinal responses are minima under train loads.Transverse acceleration responses of the lining are related with the position of the train running.By analyzing different sizes of the model,it is concluded that dynamic responses and deformations are influenced obviously by the depth of the model,and the deformation influence is relatively minor by the width and length of the model.Deformations first increase then decrease with the increase of depth for the models.Through the numerical simulation,theoretical basis is provided for analysis of engineering monitoring and the reference is given for the choice of calculation model.

关 键 词：衬砌结构 列车荷载 有限元 数值模拟 模型尺寸 

分 类 号：TU279[建筑科学—建筑设计及理论]