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浅埋偏压条件下隧道软弱围岩破坏程度的合理评价对于隧道工程的设计和施工具有重要意义。以红石沟隧道为依托,应用数值模拟方法,结合现场监测数据,深入分析不同侧覆土厚情况下,偏压隧道开挖后围岩应力场、塑性区、变形场的分布规律及支护结构的受力特征,揭示围岩的失稳破坏机制。所得结论可供红石沟隧道及类似隧道浅埋偏压段的施工和支护设计参考。
The reasonable evaluation of the damage degree of the weak surrounding rock under shallow bias conditions is of great significance to the design and construction of tunnel engineering. Based on the Hongshigou tunnel, numerical simulation and field monitoring data are used to analyze the distribution of stress field, plastic zone and deformation field of surrounding rock after bias tunnel excavation and the influence of supporting structure Of the stress characteristics, revealing the failure mechanism of surrounding rock failure. The conclusions can be used for reference for the construction and support design of the shallow offset sections of Hongshigou tunnel and similar tunnels.