大张高速铁路跨越活动断裂带选线设计探讨

Discussion on Line Selection Design of Datong-Zhangjiakou High-speed Railway Crossing Active Fault Zone

活动断裂带是目前高速铁路设计中常见的不良地质,是铁路工程稳定性的隐患之一。大同至张家口高速铁路沿线区域分布多条活动断裂带,文章对可能有影响的活动断裂带进行研究。首先研究了绕避与穿越方案,综合比选推荐穿越方案;然后对不同位置(东线、中线、西线)穿越方案以及不同型式(隧道或路基)穿越方案等多方案进行经济技术比较,综合比选推荐隧道穿越活动断裂方案;最后提出采用隧道穿越活动断裂时的相关抗震、减震措施,可为类似工程提供借鉴。

Active fault zone is a common bad geological condition in the design of high-speed railway at present,and it is one of the hidden dangers affecting the stability of railway engineering.There are many active fault zones along the Datong-Zhangjiakou high-speed railway.In this paper,the active fault zones which may affect the high-speed railway have been studied.Firstly,after comprehensive comparison of the schemes bypassing and passing through the active zones,the scheme passing through the active fault zone is recommended.Then,through the economic and technological comparison of the passing-through schemes at different locations(east,middle and west routes)and with different types(tunnels or subgrade),the scheme that the tunnel passes through active faults is recommended Finally,the relevant seismic and seismic mitigation measures for tunnel passing through active faults are put forward,which can be used for reference in similar projects.