盾尾密封系统防水失效特性试验与模拟分析  

Test and Simulation Analysis of Waterproof Failure Characteristics of Shield Tail Sealing System

作　　者：刘建国[1,2] 朱君 鞠丽艳[3] 吴迪 Liu Jianguo;Zhu Jun;Ju Liyan;Wu Di(College of Transportation Engineering,Tongji University,Shanghai 201804,China;Shanghai Key Laboratoty of Rail Infrastructure Durability and System Safety,Tongji University,Shanghai 201804,China;Technology Center of Shanghai Shentong Metro Group,Shanghai 201103,China)

机构地区：[1]同济大学交通运输工程学院,上海201804 [2]同济大学上海市轨道交通结构耐久与系统安全重点实验室,上海201804 [3]上海申通地铁集团有限公司技术中心,上海201103

出　　处：《华东交通大学学报》2023年第2期39-46,共8页Journal of East China Jiaotong University

基　　金：国家自然科学基金面上项目(51578418)。

摘　　要：盾尾密封系统的防水密封性能是影响盾构施工安全的重要因素,为分析其防水失效特性,设计了盾尾密封系统室内模型试验,并基于计算流体力学建立了对应的盾尾密封系统仿真模型。分析了在外部水压侵入过程中水油两相流体的体积分布、压力场和速度场变化,探究了盾尾结构参数、尾刷参数、油脂参数对密封性能的影响规律。结果表明:增加盾尾刷道数可有效提升防水能力;在防水失效过程中,在盾尾刷处出现流速的峰值点,流速的扩展分布与水侵入的体积分布具有一致性;盾尾刷渗透率、油脂粘度是影响初始漏水时间的敏感性因素;通过减小盾尾刷渗透率、增大油脂粘度,可有效延迟初始漏水时间,提升盾尾密封系统防水能力。The waterproofing of shield tail sealing system is an important factor affecting the safety of shield construction.A laboratory test of the shield tail sealing system was designed,and a corresponding simulation model was established based on the computational fluid dynamics to analyze the characteristics of waterproofing failure.The changes of volume distribution,pressure field and velocity field of two-phase fluid in the process of external hydraulic intrusion were analyzed,and the influence of shield tail structure parameters,tail brush parameters and grease parameters on seal performance was studied.The results show that:increasing the number of shield tail brushes can effectively improve the waterproofing ability;in the process of waterproof failure,the peak point of flow velocity appears at the tail brush of shield,and the expansion distribution of flow velocity is consistent with the volume distribution of water;the permeability of shield tail brush and the viscosity of grease are the sensitive factors affecting the initial leakage time;by reducing the permeability of shield tail brush and increasing the viscosity of grease,the initial leakage time can be delayed,and the waterproof ability can be effectively improved.

关 键 词：盾尾密封系统 CFD模拟 模型试验 防水失效 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]