Mohamed Tarek, Nasr Amro
College of Engineering and Technology, American University of the Middle East, Egaila, 54200, Kuwait.
Sci Rep. 2025 Apr 3;15(1):11483. doi: 10.1038/s41598-025-94904-3.
Ensuring the stability of faults near a tunnel is crucial for safety during excavation. This study presents a comprehensive numerical parametric analysis to evaluate fault stability in the context of tunnel construction. The analysis examines several key parameters, including fault mechanical properties, tunnel depth, fault angle, tunnel size, the distance between the fault and tunnel, and the initial stress state of the surrounding rock. These factors significantly affect stress distribution and potential fault movement, which are critical for maintaining tunnel stability. The findings emphasize the importance of specific factors, such as fault angle, the ratio of tunnel size to fault distance, and the initial stress state, in determining fault stability. To account for the interaction between these variables, a dimensionless parameter is developed, incorporating all these factors into a simplified metric for assessing the factor of safety in fault stability. A strong correlation between this dimensionless parameter and the factor of safety is established, offering a reliable method with minimal error. Finally, a case study is presented to verify the proposed safety approach, demonstrating its ability to accurately predict both the factor of safety and the location of fault slipping.
确保隧道附近断层的稳定性对于开挖过程中的安全至关重要。本研究进行了全面的数值参数分析，以评估隧道施工背景下的断层稳定性。该分析考察了几个关键参数，包括断层力学性质、隧道深度、断层角度、隧道尺寸、断层与隧道之间的距离以及围岩的初始应力状态。这些因素显著影响应力分布和潜在的断层移动，而这对于维持隧道稳定性至关重要。研究结果强调了特定因素的重要性，如断层角度、隧道尺寸与断层距离的比值以及初始应力状态，在确定断层稳定性方面的作用。为了考虑这些变量之间的相互作用，开发了一个无量纲参数，将所有这些因素纳入一个简化的度量标准，用于评估断层稳定性的安全系数。建立了这个无量纲参数与安全系数之间的强相关性，提供了一种误差最小的可靠方法。最后，通过一个案例研究来验证所提出的安全方法，证明其能够准确预测安全系数和断层滑动位置。
