摘要
以西部山区某在建工程为研究对象,利用有限元软件FLAC 3D建立了包含铁路隧道、桥梁基础和地下厂房洞室群在内完整的三维计算模型,重点研究了交叉区域施工及运营期间,在罕遇地震下结构的动力响应及结构稳定性。研究结果表明:隧道衬砌结构在地震中的内力变化明显,承受拉压交替反复作用,拱脚、拱肩和拱腰均成为薄弱结构构件;桥梁基础受地震影响产生的应力分布不均匀,最大拉压应力出现在桥基顶面,桥梁基础地震位移较大,是抗震设防应重点考虑的部分;罕遇地震作用下,地下厂房周围岩体会发生局部破坏。因此,在进行结构设计时,需考虑地震动的动力作用对工程结构的影响,对结构的薄弱环节加强设计,从源头上确保工程的安全。
a project under construction in the western mountainous area is taken as a research object.The finite el-ement software FLAC 3D is used to establish a complete three-dimensional calculation model including railway tun-nels,bridge foundations and underground powerhouse caverns.The dynamic response and structural stability of the structure under rare earthquake are studied.The research results show that the internal force of the tunnel lining structure changes significantly during the earthquake,and the arch toe,arch shoulder and arch waist become weak structural members when subjected to alternating tension and compression;the stress distribution of the bridge foundation affected by the earthquake is uneven,and the maximum tension is compressive stress that appears on the top surface of the bridge foundation,and the seismic displacement of the bridge foundation is large,which is the key part for seismic fortification;under the action of rare earthquakes,local damage will occur to the rock mass around the underground powerhouse.Therefore,when designing the structure,it is necessary to consider the impact of the dynamic action of the ground motion on the engineering structure,and strengthen the design of the weak links of the structure to ensure the safety of the project from the source.
作者
刘建红
周友权
Liu Jianhong;Zhou Youquan(China Railway First Survey and Design Institute Group Ltd,Engineering Research Center of Railway Industry of Construction Technology for Long Tunnel in Special and Complex Environment,Xi’an 710043;China Railway First Survey and Design Institute Group Ltd,Bridge&Tunnel Design Department,Xi’an 710043)
出处
《铁道技术标准（中英文）》
2022年第2期13-19,27,共8页
Railway Technical Standard(Chinese & English)
关键词
铁路隧道
桥梁基础
地下洞室群
有限元模拟
地震
Railway tunnel
bBridge foundation
Underground cavern group
Finite element simulation
Earthquake
