超软土盾构隧道接缝防水机理及优化措施

Waterproof Mechanism and Optimization Measures for Shield Tunnel Joint in Ultra-soft Soil

为了对超出设计允许张开量、错台量情况下的盾构隧道接缝防水性能进行评价,探究满足防水要求的密封垫极限张开量、错台量,基于温州市城市轨道交通M1线地铁盾构隧道工程,对选取设计的一种密封垫进行极限张开与极限错台工况下的防水数值模拟,并对该密封垫断面进一步优化。研究结果表明:压缩密封垫需要的拼装力最大值为38.6 kN/m,满足工程盾构隧道拼装力小于60 kN/m的要求;在密封张开和错台工况下,密封垫防水能力都会减小;通过优化弹性密封垫断面形状,可提高接缝防水性能,满足工程需求。

In order to evaluate the waterproof performance of shield tunnel joints that are beyond the allowable opening amount and dislocation amount of design,and to explore the limit of sealing gasket opening amount and dislocation amount that meet the waterproof requirements,based on the shield tunnel project of Wenzhou Urban Rail Transit Line M1,a designed sealing gasket is selected for carrying out the waterproof numerical simulation under the condition of extreme opening and dislocation,then the section of the gasket is further optimized.Research results show that:the maximum assembly force required for compressing the sealing gasket is 38.6 kN/m,which meets the requirement of shield tunnel assembly force of being less than 60 kN/m;under both the working conditions of sealing opening and dislocation,the waterproof ability of sealing gasket will be weakened;but the joint waterproof performance can meet the engineering requirements by optimizing the section shape of the elastic sealing gasket.