活动断裂带地区地铁新型轨道结构动力响应研究

Research on Dynamic Response of Metro Track Structure in Active Fault zone

断裂带是一种地区性的灾害地质,断层粘滑错动是地震造成跨断层隧道结构严重破坏的主要因素。乌鲁木齐九家湾断层组中的第3条断层与地铁1号线交角约71°,三向变形,预计百年垂直最大错位量约650 mm。目前国内外常用的整体道床结构设计最大调高量一般不超过60 mm,高低和水平调整量有限,无法适应1号线活动断层的变形量。对乌鲁木齐新型轨道结构进行研究,利用有限元软件ABAQUS建立车辆-轨道-隧道有限元模型,分析新型轨道结构的动力响应特性,基于仿真结果推荐新型固化道床弹性模量取值为500 MPa,可满足乌鲁木齐地铁1号线安全运营和乘客舒适性要求。

The fault zone is a kind of regional geological hazard,and the fault stick-slip is the main factor that causes serious damage to the crossing-fault tunnel structures during earthquake. The third fault of Jiujiawan fault group meets the Metro Line 1 at the angle of 71 degrees with triaxial deformation,and the expected maximum vertical dislocation is about 650 mm in 100 years. At present,the maximum height adjustment of ballastless track is less than 60 mm with limited height and level adjustment to accommodate the large deformation of active fault of Line 1. In this paper,the new track structure of Urumqi Metro is studied and a train-railway track-tunnel model is established with the finite element software ABAQUS to analyze the dynamic response of the metro track structur. Based on the simulation results,solidified ballast track elastic modulus value of 500 MPa is recommended to guarantee train operation and riding comfort of Line 1.