高水压盾构隧道管片密封垫装配力与防水性能研究  

Assembly Force and Waterproofing Performance of Segment Sealing Gasket in High Water Pressure Shield Tunnels

作　　者：文彦鑫 霍永鹏 吴悦 常鑫 张天 晏启祥[2] WEN Yanxin;HUO Yongpeng;WU Yue;CHANG Xin;ZHANG Tian;YAN Qixiang(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031;Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]西南交通大学交通隧道工程教育部重点实验室,成都610031

出　　处：《现代隧道技术》2022年第4期273-283,共11页Modern Tunnelling Technology

基　　金：国家自然科学基金(51878573)。

摘　　要：为探究高水压盾构隧道管片密封垫装配力与防水性能,依托上元门越江隧道工程,通过装配力试验、耐水压试验和数值模拟手段,分析了7种不同截面形式的密封垫在不同压缩阶段内密封垫变形特征、装配力增长规律以及耐水压力的主要影响因素。研究结果表明,密封垫的压缩过程可分为三个阶段:阶段Ⅰ密封垫装配力近似线性增长,阶段Ⅱ装配力增加缓慢,阶段Ⅲ装配力随压缩量增大快速增加至最大值。密封垫最大装配力和最大压缩量越大,其耐水压力越高,并且其装配力随压缩量增加而增长得越平稳,越有利于密封垫防水。对于不同的截面形式,在同一管片沟槽形式下,密封垫高度越高,其最大压缩量一般越大,盾构隧道管片接缝完全闭合时的装配力越大,且三角形封闭孔型优于其他孔型,底面为整片橡胶连接的密封垫优于底面为梳齿结构的密封垫。To investigate the assembly force and waterproofing performance of segment sealing gaskets in high water pressure shield tunnels, this paper analyzes the major factors that affect the characteristics of gasket deformation,the growth law of assembly force, and the water-resistant pressure of seven sealing gaskets with different cross-setional forms in different compression stages, based on the Shangyuanmen Cross-river Tunnel Project and through different means such as assembly force test, water pressure test and numerical simulation. The results show that the compression process of the gaskets can be divided into three stages: Stage I when the sealing assembly force increases almost linearly;Stage Ⅱ when the increase of the assembly force slows;and Stage Ⅲ when the compression increases rapidly to the maximum assembly force. The greater the maximum assembly force and maximum compression of the gaskets are, the higher their water-resistant pressure will be, the more steadily their assembly force would increase with the growth rate of compression, and the more conducive it will be for their waterproof performance. For different cross-sectional forms and under the same groove form of the segment, the higher the height of a gasket is,the greater its maximum compression will be in general, and the greater the assembly force will be when the shield segment joint is completely closed. Furthermore, the triangular closed-hole type is better than other hole types, and gaskets with a whole rubber joint on the bottom are better than those with a comb-tooth structure on the bottom.

关 键 词：盾构隧道 接缝防水 弹性密封垫 室内试验 数值模拟 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]