穿黄隧洞衬砌1∶1仿真模型试验研究

Full-scaled simulation model and experiment research on lining of tunnel crossing Yellow River

穿黄隧洞为大型压力输水隧洞,采用盾构法施工。设计要求在盾构施工形成的拼装式管片环内,设置预应力内衬,以组成新型复合衬砌结构。为此,开展穿黄隧洞衬砌1∶1仿真模型试验,分两阶段进行。第1阶段为准备性试验,包括对三环内衬进行1∶1仿真地面模型试验;第2阶段为地下模型试验研究,模型埋于地下,并人工构造与实际工程相同的埋深和水土条件,而以高位水箱按设计水头对洞内充水加压,进行超载试验。试验取得完全成功,为验证和优化设计提供了试验依据;其模型设计、仿真模拟、试验方法可供相关工程参考。

The tunnel crossing Yellow River of South-to-North Water Diversion Project is a large-scale pressure water conveyance project and is constructed with shield method.The inner pre-stress lining inside the assembled segments is designed to form a new compound lining structure.We conducted a full-scaled simulation experiment for the tunnel lining in two phases.In phase I,a preparatory and ground model test was performed for three inner segment linings;in phase II,an underground test was carried out： the model was embedded underground with embedded depth and soil water condition similar to the real project,and tunnel pressuring and overloading were carried out by elevating the water tank according to the design head.The experiment was successful and provided a basis for verification and optimization of design.