为从机制上深入研究超高水压下盾尾密封性能，利用机、电、液相关控制技术研制出超高水压盾尾密封性能试验台，重点设计要素有： 1）动作姿态设计，试验台通过控制油缸伸缩实现轴向移动、径向移动和转向偏转等动作，模拟盾构掘进过程中的姿态变化； 2）油脂供给设计，采用由5道盾尾刷形成的4个油脂腔，模拟超高水压盾构盾尾密封设计； 3）超高水土压力供给设计，设计一套安全、可靠、承压可达2.5 MPa的泥水循环保压系统，模拟盾构超高水土压力。试验台为模拟超高水压复杂施工环境做好了充足的准备，通过后期测试在超高水压下的静态、动态盾尾密封性能，研究不同的水土压力、油脂腔数量、油脂质量、盾尾刷质量以及盾构掘进姿态、管片错台等因素对盾尾密封性的影响程度。

To conduct an indepth investigation of the sealing performance of the shield tail under ultrahigh water pressure in principle, a test bed is developed based on mechanical, electrical, and hydraulic control technologies. The key design elements are as follows: (1) attitude design: The test bed can achieve axial movement, radial movement, and steering deflection by the expansion and contraction of oil cylinders, which can simulate the posture changes during the shield tunneling process; (2) oil supply design: Five shield tail brushes form four grease cavities for simulating the shield tail under ultrahigh water pressure; (3) design of an ultrahigh water pressure supply: A mudwater circulation pressuremaintaining system is designed for simulating ultrahigh water pressure outside the shield, which is safe, reliable, and can withstand a pressure reaching 2.5 MPa. Factors such as the mudwater pressure, number of grease cavities, shield tail grease and brush quality, shield tunneling attitudes, and segment dislocation, that affect the static and dynamic shield tail sealing performance under ultrahigh water pressure, are determined by subsequent tests.