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首页> 外文期刊>Tunnelling and underground space technology >A 3D numerical model to determine suitable reinforcement strategies for passing TBM through a fault zone, a case study: Safaroud water transmission tunnel, Iran
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A 3D numerical model to determine suitable reinforcement strategies for passing TBM through a fault zone, a case study: Safaroud water transmission tunnel, Iran

机译：一个3D数值模型，用于确定合适的加固策略以使TBM通过断层带，案例研究：伊朗萨法鲁输水隧道

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Mechanized tunneling, like other tunneling methods, is not an exception to dealing with complex geological structures in its direction. Therefore, the accurate perception of the geological structures and anomalous through the tunnel path and the challenges ahead of TBM can minimize the operational risk. The faults are complicated, loose, seismic, and saturated structures that present a great deal of danger when passing the tunnel from them, and each of these events, in turn, has the potential to stop the project and exert high economic costs. The instability of the tunnel environments and tunnel face due to the higher amount of stress concentration than the resistance of the host rock, pulpy material flowing from inside of the faults and water inrush are the most important events that TBM faced them through the fault zones. Hence, using the appropriate tool for realizing the operational model can be a considerable help in predicting problems. In this research, using precision numerical methods, accurate simulation of TBM motion was carried out to the excavation of Water Transmission Tunnel, Iran. The Safaroud water transmission tunnel is one of the longest Iranian water transmission tunnels that passes through numerous fault zones along its path. One of the main faults in this area is the Lalehzar fault with 40 m width which motivates us to utilize predicting procedure. The main purpose of this research is numerical modeling of mechanized tunneling in fault zone using FLAC3D and Phase2 software and selection of suitable reinforcement strategies for passing TBM from the fault zone. The results of numerical modeling illustrate the instability of the tunnel in the Lalehzar fault zone. Due to tunnel instability in this zone, reinforcement operations must be taken into account to stabilize the tunnel environment. The numerical modeling of the several reinforcement operations in the fault zone were simulated and we conclude that the combination of umbrella arch and radial grouting method are the most suitable strategies for passing TBM from the Lalehzar fault zone.
机译：与其他掘进方法一样，机械化掘进也不是沿其方向处理复杂地质结构的例外。因此，对隧道路径中的地质结构和异常以及TBM面临的挑战的准确认识可以将运营风险降至最低。断层是复杂的，松散的，地震的和饱和的结构，当它们从隧道中经过时会带来很大的危险，而这些事件中的每一个都有可能使项目停止并造成高昂的经济成本。隧道环境和隧道面的不稳定性是由于应力集中量大于基岩的抵抗力而引起的，从断层内部流出的纸浆材料和涌水是TBM通过断层区面对它们的最重要事件。因此，使用适当的工具来实现操作模型可以极大地帮助您预测问题。在这项研究中，使用精确的数值方法，对伊朗输水隧道的开挖进行了TBM运动的精确模拟。萨法鲁输水隧道是伊朗最长的输水隧道之一，沿其路径穿过众多断层带。该区域的主要断层之一是宽度为40 m的Lalehzar断层，这促使我们利用预测程序。这项研究的主要目的是使用FLAC3D和Phase2软件对断裂带中的机械隧道进行数值模拟，并选择合适的加固策略，以使TBM从断裂带中通过。数值模拟结果说明了Lalehzar断裂带中隧道的不稳定性。由于该区域中的隧道不稳定，必须考虑进行加固操作以稳定隧道环境。通过对断层带几种加固作业的数值模拟进行了模拟，得出结论：伞形拱和径向注浆法相结合是从Lalehzar断层带通过TBM的最合适策略。

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