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首页> 外文期刊>Bulletin of engineering geology and the environment >Understanding the mechanism of slope failure on a nearby highway tunnel route by different slope stability analysis methods: a case from NE Turkey
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Understanding the mechanism of slope failure on a nearby highway tunnel route by different slope stability analysis methods: a case from NE Turkey

机译：通过不同的边坡稳定性分析方法了解附近公路隧道路线的边坡破坏机理：以土耳其东北部为例

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摘要

The Arakli tunnel is located in the eastern Black Sea region where the most mass movement is observed in Turkey. Following the tunnel entrance portal excavations in basaltic tuffs on nearby the Konakonu residential area, an impending failure occurred. Because of the developed tension cracks and deformations on the ground, five houses and their gardens were damaged completely. The present study aims to investigate the mechanism of the failure. In order to do this, kinematic, limit equilibrium, and numerical stability analyses were carried out. Firstly, the kinematic analyses were performed taking into account the main joint sets for the slopes. The results of the kinematic analyses showed that planar and wedge failures were possible on the portal slope and no failure occurred on the cut slope. However, the limit equilibrium analysis showed that neither the planar nor wedge failures were expected to occur on the portal slope. The numerical stability analyses were performed to determine if circular failure is to occur in the slopes. The Phase 2 programme was used in the numerical analyses, and the Strength Reduction Factors (SRF) of the slopes were determined. According to the numerical stability analyses, the failure mode for the portal slope is composite starting with a circular surface and following a linear surface and circular for the cut slope. The stability analyses indicated that the failure mechanism was not directly controlled by the joints and might be related to the low strength parameters of the rock mass and joints. Finally, precautions were determined to make the region stable using the Phase 2 programme. After support installation, the SRF values for the portal and cut slopes increased from 1.21 to 1.63 and from 1.32 to 1.71, respectively. These results showed that the proposed support units prevent the effects of failure and were essential for the long-term stability.
机译：Arakli隧道位于黑海东部地区，是土耳其运动最为活跃的地区。在Konakonu住宅区附近的玄武岩凝灰岩中的隧道入口门户挖掘之后，发生了即将发生的故障。由于地面上出现的张力裂缝和变形，五栋房屋及其花园被完全破坏。本研究旨在研究故障的机理。为此，进行了运动学，极限平衡和数值稳定性分析。首先，在进行运动学分析时考虑了斜坡的主要节理。运动学分析的结果表明，在门斜面上可能发生平面和楔形破坏，而在挖方斜面上没有发生破坏。但是，极限平衡分析表明，预期在门面坡度上​​都不会发生平面或楔形破坏。进行了数值稳定性分析，以确定在斜坡上是否会发生圆形破坏。在数值分析中使用了阶段2程序，并确定了边坡的强度折减系数（SRF）。根据数值稳定性分析，门槛边坡的破坏模式是复合的，从圆形表面开始，然后是线性表面，圆形坡口则为圆形。稳定性分析表明，破坏机理不受节理直接控制，可能与岩体和节理的低强度参数有关。最后，确定了预防措施，以使用第二阶段计划使该地区稳定。支架安装后，门斜率和路cut边坡的SRF值分别从1.21增加到1.63，从1.32增加到1.71。这些结果表明，建议的支撑单元可防止故障的影响，并且对于长期稳定性至关重要。

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