【摘要】 引洮工程属大型跨流域自流引水工程。工程区广泛分布新近系红层软岩,工程地质条件复杂,存在红层软岩隧洞大变形和TBM卡机等工程地质问题。依托引洮工程7#试验洞,采用原位剪切试验、现场变形试验室内流变试验等方法,获取了新近系红层软岩的物理力学参数。采用理论计算和数值计算方法(Burgers mode),对不同埋深条件下红层软岩隧洞的变形特征和最大变形值进行分析。重点研究了TBM掘进预留变形量的问题,提出引洮工程7#红层软岩隧洞TBM掘进预留变形量建议值为9～13cm。研究成果直接服务于引洮工程,为优化设计提供直接的地质支持,也可为同类工程提供借鉴。更多还原

【Abstract】 Yintao project,a large scale inter-basin artesian diversion work,is the biggest hydraulic project in Gansu province.Its engineering geological conditions are very complicated,such as the Tertiary red-beds soft rock with large deformation of tunnel’s surrounding rockmass and so on.The physical and mechanical properties of the Tertiary red-beds are systematically studied by field exploration,direct shear testing,in-situ test of elasticity modulus of rock mass,laboratory rheological test relying on 7# experimental tunnel.On the basis of above research works,the rational engineering geological parameters were obtained.Using the physical and mechanical parameters obtained from field test and laboratory experiment,the deformation characteristic of red bed soft rock tunnel was analyzed under different depth condition by theoretical calculation and numerical calculation methods(applying the Burgers model).Then,the maximum deformation of red bed soft rock tunnel was forecasted under different condition.According to the engineering geological problems brought by TBM construction in 7#tunnel,some countermeasures and recommendations are proposed about the rational reserved deformation,which should be in range from 9 to 13 cm.The research results provide a fundamental basis for TBM design and construction.更多还原