铁道科学与工程学报2025，Vol.22Issue(1)：272-283,12.DOI:10.19713/j.cnki.43-1423/u.T20240431
盾构隧道双道密封垫防水增强机理研究
Waterproof enhancement mechanism of double gasket in shield tunnel
摘要
Abstract
Rubber gasket is the core structure of joint waterproofing of shield tunnel.With the increase of shield tunnel diameter and design water pressure,the double gasket mode has gradually become the mainstream waterproofing design scheme of shield tunnel.In order to explore the mechanism of waterproof enhancement of double gasket compared with single gasket,the waterproof test of double gasket was carried out under the normal working condition without inner cavity water pressure and the special working condition with inner cavity water pressure.The water pressure time-history curves of central cavity and inner water cavity were recorded.The leading factors of waterproof enhancement were obtained under the two conditions.The results show that under the action of viscous resistance,the pressure drop caused by the pressure water flowing from the central cavity into the inner water cavity is the main factor affecting the waterproof enhancement of the double gasket under normal working conditions.The smaller the porosity of the gasket under compression,the more significant the viscous resistance pressure drop effect.By introducing porosity influence coefficient,a calculation method of viscous resistance pressure drop effect based on porous media seepage theory is proposed,and the acquisition methods of three key parameters,porosity,fluid velocity and average particle diameter of porous media,are given.Under the reaction of the water pressure in the inner cavity,the additional contact stress of the external gasket is the main factor affecting the waterproof enhancement of the external gasket under special working conditions.The greater the compression degree of the gasket,the more obvious the waterproof enhancement effect under the action of inner cavity water pressure.By evaluating the equivalent Poisson's ratio of gasket with the aid of compactness index,the calculation method of waterproof enhancement ability under the action of inner cavity water pressure is put forward.The waterproof enhancement mechanism of viscous resistance and inner cavity water pressure on double gasket is studied and proved,and two calculation methods of enhancement effect are given.The results can provide reference for waterproof design of double gasket.关键词
盾构隧道/双道密封垫/失效机理/接缝防水/黏滞阻力Key words
shield tunnel/double gasket/failure mechanism/joint waterproofing/viscous resistance分类
土木建筑引用本文复制引用
龚琛杰,解超然,林赞权,雷明锋,王海林,宋建荣,葛洋洋..盾构隧道双道密封垫防水增强机理研究[J].铁道科学与工程学报,2025,22(1):272-283,12.基金项目
国家自然科学基金资助项目(52278421,52378420) （52278421,52378420）
特种功能防水材料国家重点实验室开放课题(SKWL-2022KF01) （SKWL-2022KF01）
中国国家铁路集团有限公司科技研究开发计划(K2021G022) （K2021G022）
中国科协青年人才托举工程项目(2022QNRC001) （2022QNRC001）
湖南省科技人才托举工程项目(2023TJ-N24) （2023TJ-N24）
中南大学创新驱动研究计划项目(2023CXQD067) （2023CXQD067）
湖南省衡永高速公路建设开发有限公司课题(HY2307ZX005) （HY2307ZX005）
