【作者】 莫一婷；

【导师】 杨林德；

【作者基本信息】 同济大学 ， 结构工程， 2007， 硕士

【摘要】 随着隧道主体结构的设计使用年限增加到100年,盾构隧道耐久性能要求更高了。同时已建的盾构隧道在使用过程中出现了渗漏,钢筋锈蚀,混凝土管片破损等许多问题,造成大量人力物力的损失。众所周知,在盾构隧道衬砌结构中管片环向接头和管片纵向环间接头的构造及其耐久性对衬砌整体结构的受力变形和耐久性起着极其重要的影响作用。故有必要通过试验及理论分析对盾构隧道的衬砌接头的构造及其耐久性等问题进行专门研究。本项研究结合国家自然科学基金项目《地下混凝土衬砌结构的耐久性与使用寿命》,以上海长江隧道工程为背景,针对影响接头耐久性的主要因素开展研究。一方面为当今我国盾构隧道中的防水材料提出新的预测其使用寿命的模型,简化寿命预测方法,进行试验研究;并通过对盾构隧道衬砌接头结构和耐久性的研究结合防水措施提出优化建议;另一方面为研究大型越江隧道的受力状态和破坏机理及评价衬砌接头的安全性进行纵向受力分析。本文主要研究内容和成果包括:1.分析了盾构隧道接头的构造及影响其耐久性的常见因素。通过研究盾构隧道接头的构造和对国内外常用的多种接头形式的比较,提出了接头防水材料的耐久性,衬砌接头的受力特性,等等也是盾构隧道整体耐久性的重要影响因素。2.实验研究了盾构隧道中常用的防水橡胶材料。根据对盾构隧道的两种常用的橡胶——三元乙丙橡胶及遇水膨胀橡胶材料的室内快速老化试验的结果,得出两种橡胶的热氧老化规律。其中遇水膨胀橡胶老化后的拉伸性能和膨胀性能的试验结果,弥补了遇水膨胀橡胶在基础研究方面的空白。3.提出了橡胶寿命的预测模型。通过对橡胶试验结果的分析,提出新的橡胶寿命的预测模型;运用数据分析统计软件,简化数据处理的程序;对盾构隧道常用橡胶的使用寿命进行预测。得到在热氧老化环境中三元乙丙橡胶和遇水膨胀橡胶的使用寿命能达到100年的结论。4.评估了防水材料的耐久性;并提出提高其耐久性的优化方案。根据橡胶材料使用年限的预测结果,结合对盾构隧道接头形式及防水措施的研究,对提高防水质量和接头刚度从管片拼装形式,衬砌接头形式,衬砌接头构件参数到防水方案,渗漏水治理等方面提出相关优化建议。5.进行了盾构隧道纵向受力分析并对其进行了安全性评价。结合上海长江隧道的设计参数,运用等效轴向刚度模型的理论,分析盾构隧道的纵向受力状态和破坏机理,结合计算结果分析了管片接头的受力状态并对其进行安全性评价。更多还原

【Abstract】 With the design service life of the major structure of tunnel added to 100 years, the requirement of shield tunnel has been higher than before. Meanwhile in the service process the tunnels which have been build have appear many problem, such as leakage, steel-bar corrosion, concrete segment disrepair,etc, which has caused large expense of manpower and material resources. While, it is come to light that the structure of durability of ring joint and segment joint within the structure of shield tunnel lining play a very important roal to the constrained and durability of the whole structure shield tunnel. So it is necessary to study the issue of the structure and durability of lining joint of shield tunnel specialiy through experiments and theoretical analysis.This paper is involved with the scientific project of Shanghai Construction Technology Expansion Funds, the durability and service life of underground concrete lining structure, at the background of the tunnel of Shanghai Changjiang River, the study aim at the main infection factors of lining joint. On one hand, through experimental investigatin give new forcast model and simplifmg forcast method for the waterproof material which is often used in shield tunnel, and give optimizing advices through study the structure and durability of lining joint of shield tunnel combine with methods of waterproof. On the other hand, through analyzing shield tunnel longitudinal stress study the longitudinal stress condition of huge crossing-river tunnel and its spoil mechanism and evaluat lining joint security. The work and fruits of this paper are the followings:1. Analyzing the structure of the lining joint of the shield tunnel and influencing factor of its durability. Through study the structure of the lining joint of the shield tunnel and comparing some kinds of joint used in outland and inland, get the conclusion of that many factors, such as the service life of waterproof material of joint, the stress speciality of lining joint, play a very impotant role in the durability of the whole structure shield tunnel. 2. Experimental investigating two kind of waterproof material which is often used in shield tunnel. According to the experiments result of two kind of waterproof material ,the indoor celerity experiments result of ethylene-propylene-diene rubber and water-swell rubber, get the aging regular of these two kinds of rubber. The experiments result of tension capability and swell capability of water-swell rubber, make up the blankness of base study of water-swell-rubber.3. Giving new forcast model of service life of the waterproof material. Through analyzing experiments result of two kind of waterproof materials give new forcast model of service life of the waterproof material. Use data analysis statistics software to predigest the method of data disposal, and forcast the service life of the waterproof material. Give the conclusion of that the ethylene-propylene-diene rubber and water-swell rubber can meet the request of the 100 years’ service life in the hot and oxygen circumstance.4. Evaluate the durability of waterproof material, and give optimizing advices which could improving the durability. According to the result of forcast the service life of the waterproof material combine with study of the structure of lining joint of shield tunnel and methods of waterproof give some experimental investigatin on the form of lining tinertoy, and form of lining joint, and parameter of lining joint member, and methods of waterproof and father of leaking water, etc, to improve quanlity of waterproof and joint stiffness.5. Analyzing shield tunnel longitudinal stress and evaluating lining joint security. Combine with the design paramenter of the tunnel of Shanghai Changjiang River and use the theory of equivalently-longitudinally stiffness model analysis the longitudinally stress and spoil mechanism of shield tunnel. Analyzing the stress condition of lining joint and evaluating its security combine with the calculate results.更多还原