Throughout construction process of a tunnel in an active tectonic region, it may be impossible to avoid active faults. Active faults create two adverse effects on the tunnels which are sudden fault displacement and weak ground conditions in fault zone. If a tunnel crossed by an active fault, the tunnel might be damaged by sudden movement of the fault. However, the main goal is to localize this damage without complete loss of tunnel. In this study, a special design developed for a wide span tunnel cut by an active fault is presented and the performance of the design is verified by numerical analyses. T9 tunnel was constructed within the scope of Ankara–Sivas High-Speed Train Project, Turkey, and the special design at the intersection of T9 tunnel with the Akdagmadeni active fault is the main subject of this study. T9 tunnel predominantly passes through agglomerate, basalt, marble and gneiss units and the tunnel route crosses the Akdagmadeni fault at around Km: 327 + 915. At this location, major deformations occurred in the tunnel and the tunnel excavation had to stop for a certain period. After the re-design phase, a special tunnel support system for this location were developed and proposed design was analyzed with numerical analyses. In addition, the possible displacement of the Akdagmadeni fault was estimated and the inner lining was re-designed considering the seismic parameters (i.e. peak ground acceleration and maximum displacement during a large earthquake). Consequently, in the present study, the effects of active fault crossing on the tunnel were explained and a special inner lining design was proposed to localize the possible damages, which are originated from the sudden displacement of the active fault.

在活动构造区域内的整个隧道施工过程中，可能无法避免活动断层。活动断层对隧道产生两个不利影响，即断层突变和断层带弱地面条件。如果隧道被活动的断层穿越，则断层的突然移动可能会损坏该隧道。但是，主要目标是在不完全丢失隧道的情况下定位此损坏。在这项研究中，提出了一种针对活动断层切割的大跨度隧道开发的特殊设计，并通过数值分析验证了设计的性能。T9隧道是在土耳其安卡拉-西瓦斯高速火车项目的范围内建造的，T9隧道与Akdagmadeni活动断层相交处的特殊设计是本研究的主要主题。T9隧道主要穿过附聚物，玄武岩，大理石和片麻岩单元，隧道路线在327 + 915 Km处越过Akdagmadeni断层。在此位置，隧道发生了重大变形，隧道开挖必须停止一段时间。 。在重新设计阶段之后，针对该位置开发了一种特殊的隧道支撑系统，并通过数值分析对了拟议的设计进行了分析。另外，估计了阿克达玛德尼断裂的可能位移，并考虑了地震参数（即，峰值地面加速度和大地震中的最大位移）重新设计了内衬。因此，在本研究中，解释了主动断层穿越对隧道的影响，并提出了特殊的内衬设计以定位可能的破坏，