西安站改扩建工程跨地裂缝结构概念设计及措施研究

Study on concept design and measures of across ground fissure structure in reconstruction andextension project of Xi'an railway station

在西安站改扩建工程中,西安f3地裂缝从西安站车场斜向穿过,其中高架候车室、市政地下通廊及东配楼等建筑受其影响。采取了以下概念设计和措施来降低地裂缝对本工程的危害:整体设计上,采用了高架候车室与市政地下通廊分离式的布置方式,使得轨道层完全避开地裂缝的影响;高架候车室等上部结构采用上下盘基础避让,跨越地裂缝结构采用简支钢桁架连廊的方式,市政地下通廊通过分段设置将结构分成几段斜交箱涵结构,以适应地裂缝变形要求。通过整体概念设计、有限元数值模拟及缩尺模型振动台试验表明,跨地裂缝简支钢桁架连廊可适应地裂缝及大震的变形,达到“大震不倒”的性能要求;市政地下通廊应力、应变均可满足地裂缝的变形要求。

In the reconstruction and expansion project of Xi'an Railway Station,the f3 ground fissure crosses diagonally from the Xi'an Railway Station parking lot,and the buildings such as elevated waiting room,municipal underground corridor and east distribution building are affected by it.The following concept designs and measures was adopted to reduce the damage of ground fissures to the project:in the overall design,the separation layout of elevated waiting room and municipal underground corridor was adopted,so that the track layer can completely avoid the influence of ground fissures;the upper structure such as the elevated waiting room adopted the upper and lower wall foundation to avoid,and the structure crossing the ground fissure adopted the simply supported steel truss,the municipal underground corridor was divided into several sections of skew box culvert structure to adapt to the deformation requirements of ground fissures.Through overall concept design,finite element numerical simulation and scale shaking table model test,it is shown that the simply supported steel truss corridor across ground fissures can adapt to the deformation of ground fissures and large earthquakes,and meet the performance requirements of"no collapse in large earthquakes";the stress and strain of the municipal underground corridor can meet the deformation requirements of ground fissures.