活断层蠕滑与震动对高铁路基变形影响分析  

Analysis of High-speed Railway Subgrade Deformation under the Action of Active Fault Creep and Vibration

作　　者：闫茜 王连俊[1] 毛忠良 刘涵 YAN Qian;WANG Lianjun;MAO Zhongliang;LIU Han(Beijing Jiaotong University,Beijing 100044,China;China Railway Fifth Survey and Design Inst让ute Group Co.Ltd,Beijing 102600,China)

机构地区：[1]北京交通大学,北京100044 [2]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道工程学报》2020年第12期38-43,共6页Journal of Railway Engineering Society

摘　　要：研究目的:在当前国内高等级铁路大规模建设,不可避免需穿越活动断裂区域的背景下,为综合考察断层蠕滑位移与粘滑震动叠加作用下高铁路基结构的变形响应特征,分析铁路服役年限内地震发生时机对路基工程变形特征的影响,本文建立考虑活断层不同运动类型的三维数值模型,分析多种工况下路基变形特征。研究结论:(1)断层蠕滑运动作用下路基变形主要表现为随基岩运动同方向的整体平动;(2)线路纵向影响范围对于逆冲型蠕滑量较为不敏感,对平移断层的蠕滑发展却较为敏感;(3)逆断层的影响范围显著大于正断层;(4)已有蠕滑累积量是震动发生后路基变形的重要影响因素,且逆断层与走滑断层较正断层对时间更为敏感;(5)从铁路抗震抗断角度出发,徐宿淮盐铁路跨越郯庐活动断裂宜采用有砟轨道路基,相应计算结果可为高铁跨越活断层路基工程的加固设计与实施提供计算依据。Research purposes:Under the background of domestic large scale construction of high-grade railway,inevitably crossing active fault region sometimes,in order to investigate the deformation properties of railway subgrade under the superposition of fault creep displacement and stick-slip vibration,and analyze the effect of earthquake occurrence timing during railway service period,this paper established 3 D numerical simulation model considering creeping-deformation of active fault,and analyzed the subgrade deformation characters under multi engineering conditions.Research conclusions:(1)The subgrade deformation under fault creep is mainly displayed by whole translational movement in the same direction with the movement of bedrock.(2)The longitudinal influence scope of the line is less sensitive to the creep slip of the thrust movement,but more sensitive to the creep slip development of the translational fault.(3)The longitudinal influence scope of reverse fault is much greater than normal fault.(4)The existed creep accumulation is an important effect factor for subgrade deformation after-earthquake and reverse fault and strike-slip fault is more time-sensitive.(5)From the perspective of railway seismic resistance,Xuzhou-Yancheng Railway spanning Tan-Lu Fault is recommended by the form of ballast-track subgrade,and the research results can also provide computation basis for the design and construct of high-speed railway subgrade spanning active fault.

关 键 词：活动断裂 蠕滑位移 震动叠加 纵向影响范围 路基变形 

分 类 号：TU435[建筑科学—岩土工程]