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软岩隧道围岩蠕变特性会对隧洞的长期稳定性产生重要影响。以厦门岩内隧道为研究对象,对取自现场的全风化花岗岩进行了一系列三轴蠕变试验研究,建立了适用于该岩石的幂指数蠕变模型,通过对试验数据的分析得到了隧道围岩的蠕变参数。将全风化花岗岩蠕变模型嵌入到有限元程序中,对岩内隧道的长期稳定性进行了分析。结果表明,由于围岩的蠕变特性,隧道建成2年内围岩的变形较大,但逐渐趋于稳定。隧道运营10年后,围岩变形导致的衬砌破坏区主要集中在拱脚部位,面积较小,不会对隧道的长期稳定性产生影响。
The soft rock tunnel surrounding rock creep characteristics will have an important impact on the long-term stability of the tunnel. A series of triaxial creep tests have been carried out on the fully weathered granite taken from the site in Xiamen Iwan Tunnel, and a power exponent creep model suitable for the rock has been established. Based on the experimental data, the tunnel circumference Rock creep parameters. The fully weathered granite creep model is embedded into the finite element program, and the long-term stability of the tunnel in the rock is analyzed. The results show that due to the creep characteristics of surrounding rock, the deformation of surrounding rock is large during the two years of tunnel construction, but gradually stabilized. After tunnel operation for 10 years, the lining damage area caused by the deformation of surrounding rock mainly concentrates on the arch foot area and has a small area and will not affect the long-term stability of the tunnel.