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Creep-slip behaviors of surrounding rocks in a water diversion tunnel considering strike-slip and dip-slip scenarios
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.tust.2025.106405
Chengwei Zhao, Hui Zhou, Chuanqing Zhang, Wenbo Liu, Lingyu Li, Zhongbo Liu, Zhengyang Huo

A 3D numerical model of distributed fault is established in this paper. Considering both strike-slip and dip-slip, the stress evolution and spatial–temporal migration characteristics of surrounding rock at different creep-slip times and depths are analyzed during creep-slip. The failure approach index (FAI) was employed to assess the failure degree. The results show that the shearing and squeezing behaviors of the surrounding rock are obvious during creep-slip. The stress direction rotates sharply in the hanging wall and influence zone. Several obvious stress concentration areas (bottom and right) and unloading areas (top and left) are formed in the hanging wall near the slip surface. From the FAI values, the shear failure generates near the slip surface and extends to the hanging wall, especially in the surrounding rock at the top and left. The failure has experienced a rapid growth stage (0–5 years), a slow growth stage (5–40 years), and an accelerated growth stage (40–100 years) during the creep-slip. The maximum FAI values in the surrounding rock at the top and left are 6.5 and 8.4, respectively, and little failure occurs in the surrounding rock at the bottom and right. More attention should be paid to the failure range and failure degree in the axial direction of the tunnel when the stress ratios are of 0.5:1 and 2:1. The dip angle and dip direction only affect the failure mode and failure degree in the tunnel section. These should all be considered when designing the protection measures. The peak position of displacement gradient is inconsistent with the peak position of maximum principal stress and peak position of FAI, which may be affected by the model parameters. This study may provide a basis for the prevention and control of fault slip in tunnels crossing faults under similar geological conditions.

中文翻译:


考虑走滑和倾滑情景的引水隧道围岩的蠕变滑移行为



本文建立了分布式故障的三维数值模型。同时考虑走滑和倾滑,分析了爬滑过程中不同爬滑时间和深度围岩的应力演变和时空迁移特征。采用失效方法指数 (FAI) 评估失效程度。结果表明:在蠕变滑移过程中,围岩的剪切和挤压行为明显;应力方向在悬壁和影响区域中急剧旋转。在靠近滑移面的上盘中形成了几个明显的应力集中区(下和右)和卸载区(上和左)。从 FAI 值来看,剪切破坏在滑移面附近产生,并延伸到上墙,尤其是在顶部和左侧的围岩中。在蠕变滑移期间,失败经历了快速生长阶段(0-5 年)、缓慢生长阶段(5-40 年)和加速生长阶段(40-100 年)。顶部和左侧围岩的最大 FAI 值分别为 6.5 和 8.4,底部和右侧围岩发生破坏的现象很少。当应力比为 0.5:1 和 2:1 时,应多注意隧道轴向的破坏范围和破坏程度。倾角和倾角方向仅影响隧道断面的破坏模式和破坏程度。在设计保护措施时,应考虑这些因素。位移梯度的峰值位置与最大主应力的峰值位置和 FAI 的峰值位置不一致,这可能受到模型参数的影响。 本研究可为相似地质条件下穿越断层隧道的断层滑移防治提供依据。
更新日期:2025-01-21
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