Rock creep is one of the most important mechani cal behaviors of rocks. Because of this, stress adjustment will continue a long time after tunnel excavation, and the load will be born jointly by the primary support and secondary lining. In the design of a tunnel, the secondary lining is usually regarded as the reserve for tunnel safety without an analysis of the effects of a creep load on the secondary lining. Therefore, it is necessary to analyze the force applied to the secondary lining and the physical condition of the secondary lining over time. Using the Nibashan Tunnel as an example, this paper analyzes the effects of creep at different times on stress redistribution of the surrounding rocks and the mechanical performances of secondary linings using Burger's model of FLAC3D.%岩石蠕变是岩石的重要力学特征之一.在隧道开挖完之后的很长时间内,围岩会因为蠕变而进行应力调整,蠕变产生的荷载由隧道的初期支护和二次衬砌联合承担.在隧道设计中往往将二次衬砌作为安全储备,而没有分析围岩蠕变荷载对二次衬砌的影响,因此分析隧道二次衬砌受力以及健康程度随时间的变化是十分有必要的.文章结合泥巴山隧道工程,利用大型有限差分软件FLAC3d的Burgers蠕变模型,分析了不同时间蠕变对围岩应力重分布以及对二次衬砌的力学性能的影响,得出了一些有价值的结论.
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