断层蠕滑错动作用下高铁路基变形特征研究  

Study of Deformation Characteristics for High-speed Railway Subgrade Subjected by Creeping Dislocation of Active Fault

作　　者：闫茜 YAN Qian(China Railway Fifth Survey and Design Institute Group Co.Ltd,Beijing 102600,China)

机构地区：[1]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》2025年第2期29-34,共6页Journal of Railway Engineering Society

基　　金：中国铁建股份有限公司科研计划项目(16-C57)。

摘　　要：研究目的:活动断裂蠕滑错动影响下高速铁路路基工程的变形特征及控制方法是一项亟待解决的重大科学问题。本文通过建立可考虑断层蠕滑活动特性的“基岩-覆盖层-路基结构”三维分析模型,分析断层蠕滑错动作用下高速铁路路基结构的变形特征,阐明断层的运动方式、位错量、覆盖层厚度等主要影响因素对路基变形的作用方式及敏感程度。研究结论:(1)不同运动方式的断层位错作用导致路基面及边坡呈现不同形态的变形特征,特别是走滑作用下的近断层边坡表现出明显的“中部鼓胀”;(2)在倾滑断层蠕滑错动作用下,存在着使路基不平顺范围趋向稳定的临界蠕滑量和临界覆盖层厚度;(3)走滑量的增大明显加剧路基侧移与近断层边坡的“中部鼓胀”,而足够的覆盖层厚度则将明显平缓上述侧向变形;(4)本研究结果可为铁路路基工程在断层错动背景下的变形控制提供参考。Research purposes:This paper established a three-dimensional numerical analysis model of'bedrock cover layer-subgrade'that can consider the features of fault creep activity,analyzed the deformation characteristics of subgrade structure under the action of fault creep dislocation,and clarified the action mode and sensitivity of various chief influencing factors on subgrade deformation,such as fault movement mode,creep amount,thickness of overlying soil.Research conclusions:(1)Different creeping modes of active faults lead to different deformation characteristics of subgrade surface and slope,in particular,the near-fault slope under the action of strike-slip shows obvious'middle bulging'.(2)Under the action of dip-slip fault dislocation there is a critical creep amount and critical overburden thickness that make the subgrade irregularity range tend to be stable.(3)The increase of strike-slip displacement obviously aggravates the lateral displacement of the subgrade and the'middle bulging'of a near-fault slope,while the sufficient thickness of overburden will obviously smooth the above lateral deformation.(4)Those analysis results can provide a reference for the deformation control of railway subgrade under the background of fault dislocation.

关 键 词：活动断裂 蠕滑错动 临界位错量 临界覆盖层厚度 路基变形 

分 类 号：TU16[建筑科学—建筑理论]