丹巴水电站引水隧洞开挖期围岩流变分

依托丹巴水电站引水隧洞开挖工程，考虑隧洞不同深度围岩的受力特点将围岩进行分区，把加载流变试验和卸载流变试验参数分别赋入，计算得到了隧洞围岩衬砌的弯矩与轴力分布，可作为衬砌厚度及配筋设计等方面的参考要素。给出了80%、85%预留量条件下的衬砌所受轴力，各向同性与横观各向同性本构计算出的最危险工况内力叠加，以便在考虑流变条件下的衬砌厚度选取。

Analysis on rheological characteristics of surrounding rock during excavation of diversion tunnel for Danba Hydropower Station

Based on the excavation of the diversion tunnel for Danba Hydropower Station， the surrounding rock is zoned under the consideration of the stress characteristics of the surrounding rocks at various depths， and then the parameters from both the loading rheological test and the unloading rheological test are respectively introduced in， thus the bending moment and the axial force distribution of the lining for the tunnel surrounding rock are obtained from the relevant calculation. These can be taken as the reference factors in the aspects of the designs of the lining thickness and reinforcement， which give out the axial force suffered by the lining under the condition of the reserves of 80% and 85% and the internal force superimposition in the most dangerous operation condition calculated with the isotropic and transversely isotropic constitutions， so as to select the lining thickness under the consideration of the rheological condition.