深层排水盾构隧道接缝防水密封垫形式试验研究

发布时间：2018-02-01 05:17

本文关键词： 深层排水盾构隧道弹性密封垫接缝防水模型试验　出处：《现代隧道技术》2016年06期 　论文类型：期刊论文

【摘要】：国内大型深层排水隧道的建设目前尚无先例,技术上存在很多难题。深层排水隧道埋深一般达40 m及以上,需承受的水压力很高。深层排水隧道接缝采用内外双道密封垫,受盾构机规模的限制,其装配力不宜过大,且密封垫尺寸较小,不具备目前国内大型水下隧道密封垫厚、大的特点,防水能力将受到极大考验。因此,进行密封垫防水试验,确保弹性密封垫具有稳定的长期耐高水压性能显得格外重要。文章以广州深层排水盾构系统东濠涌试验段工程为依托,根据工程实际尺寸1∶1制作了弹性密封垫和混凝土试件,并利用自主设计的可三向加载高水压防水性能试验系统,进行了多组防水性能试验,总结了试验现象与规律,对接缝不同张开量、错位量情况下的接缝防水能力进行了比较,得到了相关规律,验证了深层排水盾构隧道接缝防水采用密封垫方案的可行性。
[Abstract]:At present, there is no precedent for the construction of large deep drainage tunnel in China, and there are many technical problems. The buried depth of deep drainage tunnel is generally 40 m and above. The water pressure to be borne is very high. The deep drainage tunnel joint adopts both internal and external seal gaskets. Due to the limit of shield machine size, the assembly force should not be too large, and the size of seal gasket is smaller. The waterproofing ability of domestic large underwater tunnel is greatly tested because of its thick and large gasket. Therefore, the waterproofing test of gasket is carried out. It is particularly important to ensure that the elastic gasket has a stable long-term high water pressure resistance. This paper relies on the Haozhong test section of Guangzhou deep drainage shield system. According to the actual engineering size of 1: 1, the elastic seal gasket and concrete specimen were made, and many groups of waterproof performance tests were carried out by using the self-designed three-direction loadable high hydraulic waterproofing performance test system. The experimental phenomena and laws are summarized, and the waterproofing ability of the joint is compared under the condition of different opening amount and dislocation quantity of the butt joint, and the relevant rules are obtained. The feasibility of adopting sealing gasket for waterproofing of deep drainage shield tunnel joint is verified.
【作者单位】：同济大学土木工程学院地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;广州市市政工程设计研究院;广东省水利水电科学研究院;
【基金】：国家自然科学基金(51378388)
【分类号】：U455.43
【正文快照】： 1引言旦出现渗漏,不仅会影响隧道的长期稳定性,甚至可能会引起隧道内的雨污外渗,导致深层土体、水质污深层排水隧道系统具有防治内涝效果好、可实染等不可挽回的后果。目前,盾构隧道管片接缝广施性强等诸多优点[1]。近年来,我国沿海地区特大泛采用弹性密封垫的防水设计[2,3],

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