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利用大酉山隧道施工过程中变形的现场监测数据与数值模拟方法,采用广义开尔文3单元流变力学模型对隧道围岩的粘弹性流变力学参数进行反演,得到了大酉山黄土隧道围岩弹性阶段弹性模量、蠕变阶段弹性模量和粘性系数3个基本流变力学模型参数。在此基础上,利用数值模拟方法对大酉山隧道围岩的长期稳定性进行了研究分析。结果表明,大酉山隧道围岩变形需200~220 d才能进入稳定期,隧道累积变形量约为0.112 m。研究成果为大酉山隧道后续方案的制订提供了依据,也为今后类似黄土隧道的设计与施工提供了借鉴。
Based on the on-site monitoring data and numerical simulation of the deformation during the construction of the Taiyounshan Tunnel, the viscoelastic rheological mechanical parameters of the surrounding rock of the tunnel were inverted using the generalized Kelvin 3-unit rheological mechanics model. Rock elastic modulus, creep elastic modulus and viscosity coefficient of three basic rheological mechanical parameters. On this basis, the long-term stability of the surrounding rock of Dayoushan Tunnel was studied by numerical simulation. The results show that the deformation of Taiyashan tunnel rock needs 200 ~ 220 d to enter the stable period, and the cumulative deformation of the tunnel is about 0.112 m. The research results provide the basis for the formulation of the follow-up plan of the Taiyou Mountain Tunnel and the reference for the design and construction of the similar loess tunnel in the future.