中文摘要：

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。

英文摘要：

The appropriate evaluation of the shallow buried tunnels in weak surrounding rock mass under unsymmetrical loading conditions is significant important for the tunnel design and construction. This paper presents a case history of construction of Hongshigou Tunnel. The stress field, plastic zones as well as deformation field of the unsymmetrically loaded shallow tunnel is simulated under different soil cover height by numerical analysis. The failure mode of the surrounding mass is also studied.