Due to the complexities of design and technical issues of construction, tunnels are considered to be enormous financial investments. Therefore, rehabilitation with the purpose of providing a higher life span is essential. Underground facilities usually have a higher service period than expected when designed, which often requires regular inspection. This study aims at providing a guideline for future tunnel investigations and maintenance. Offered solutions with regard to different cases of an anomaly for three available tunnels in the Ilam province have been introduced. These currently servicing tunnels are usually constructed as unlined rock tunnels excavated, using controlled blasting. Masonry, reinforced concrete, and shotcrete lining systems have been used in the collapsible zones. These infrastructures as part of the transportation network of the Ilam province in Iran are located in one of the most active seismic, as well as high rainfall zones in the Middle East. Aging and degradation of material alongside recent earthquake activities can lead to massive destruction of the tunnels if regular maintenance work doesn't take place. All tunnels were evaluated using advanced numerical analysis methods. Stress and displacement values ​​in the rock mass and different lining systems have been investigated using various analytic methods and the rehabilitation programs for tunnels were developed and introduced. The high risk of failure in the tunnel in the Payambar tunnel is predicted in cases of a seismic event affected by the inclination of rock layers. Methods of rehabilitation have been proposed to improve stability and decrease deformations. The formation of icicles in the Azadi tunnel during the cold seasons have been solved through employing a temporary water drainage system. Unlined tunnel sections were planned to be covered with reinforced concrete lining and both cast-in-place and precast segmental lining systems have been proposed. In the Shabab tunnels an extremely disturbed, 2–3 m deep rock layer was found between the masonry lining and the top of the tunnels, due to its controlled blasting excavation technique. Filling the voids using a pressure grouting technique was discovered in order to improve the tunnel stability during an earthquake event.

由于设计的复杂性和施工技术问题，隧道被认为是巨大的财务投资。因此，以提供更长寿命为目的的康复是必不可少的。地下设施的服务期通常比设计时预期的要长，这通常需要定期检查。这项研究旨在为将来的隧道调查和维护提供指导。已经针对伊拉姆省三个可用隧道的异常情况提供了解决方案。这些目前正在维修的隧道通常采用控制爆破的方式开挖成无衬砌的岩石隧道。在可塌陷区域中使用了砌体，钢筋混凝土和喷射混凝土衬砌系统。这些基础设施是伊朗伊拉姆省交通网络的一部分，位于中东地震最活跃的地区以及高降雨地区之一。如果不进行定期维护，材料的老化和退化以及最近的地震活动可能导致隧道的大规模破坏。所有隧道均采用先进的数值分析方法进行了评估。使用各种分析方法研究了岩体和不同衬砌系统中的应力和位移值，并制定并引入了隧道修复程序。预测在地震事件受岩层倾角影响的情况下，Payambar隧道的隧道发生故障的风险很高。已经提出了康复方法以改善稳定性并减少变形。通过使用临时排水系统，已解决了寒冷季节阿扎迪隧道中冰柱的形成。计划在未衬砌的隧道段上覆盖钢筋混凝土衬砌，并且已经提出了现浇和预制分段衬砌系统。在Shabab隧道中，由于其受控的爆破开挖技术，在砌体衬砌和隧道顶部之间发现了2–3 m的深层扰动。为了提高地震事件期间的隧道稳定性，发现了使用压力灌浆技术填充空隙。通过使用临时排水系统，已解决了寒冷季节阿扎迪隧道中冰柱的形成。计划在未衬砌的隧道段上覆盖钢筋混凝土衬砌，并且已经提出了现浇和预制分段衬砌系统。在Shabab隧道中，由于其受控的爆破开挖技术，在砌体衬砌和隧道顶部之间发现了2–3 m的深层扰动。为了提高地震过程中的隧道稳定性，发现了使用压力灌浆技术填充空隙。通过使用临时排水系统，已解决了寒冷季节阿扎迪隧道中冰柱的形成。计划在未衬砌的隧道段上覆盖钢筋混凝土衬砌，并且已经提出了现浇和预制分段衬砌系统。在Shabab隧道中，由于其受控的爆破开挖技术，在砌体衬砌和隧道顶部之间发现了2–3 m的深层扰动。为了提高地震事件期间的隧道稳定性，发现了使用压力灌浆技术填充空隙。由于其控制的爆破开挖技术，在砌体衬砌和隧道顶部之间发现了2-3 m的深层岩石。为了提高地震事件期间的隧道稳定性，发现了使用压力灌浆技术填充空隙。由于其控制的爆破开挖技术，在砌体衬砌和隧道顶部之间发现了2-3 m的深层岩石。为了提高地震事件期间的隧道稳定性，发现了使用压力灌浆技术填充空隙。