大跨公路隧道结构耐久性分析

山东大学学报(工学版)

大跨公路隧道结构耐久性分析

谭忠盛¹, 黄成造², 刘恒¹, 朋改非¹

1. 北京交通大学土建学院, 北京 10004; 2. 广州珠江黄埔大桥建设有限公司, 广州 510725

收稿日期:2007-09-30 修回日期:1900-01-01 出版日期:2008-06-16 发布日期:2008-06-16
通讯作者: 谭忠盛

Durability analysis of large span road tunnels

TAN Zhong-sheng¹, HUANG Cheng-zao², LIU Heng¹, PENG Gai-fei¹

1. School of Civil Engineering and Architecture,Beijing Jiaotong University, Beijing 100044, China;2. Guangzhou Pearl River Bridge Construction Co. Ltd. Guangzhou 510725, China

Received:2007-09-30 Revised:1900-01-01 Online:2008-06-16 Published:2008-06-16
Contact: TAN Zhong-sheng

摘要/Abstract

摘要： 对广州龙头山大跨公路隧道进行衬砌结构耐久性研究,根据隧道的环境特点及地下水质情况得出衬砌结构处于I类环境,环境作用等级属I-B,其主要的耐久性劣化机理是表层混凝土碳化引起的钢筋锈蚀.由于隧道跨度大,拱部拉应力区大,容易产生裂缝,裂缝的存在加剧了混凝土的劣化速度.在分析影响衬砌耐久性因素的基础上,研究了混凝土优化的配合比.通过大量试验提出了提高混凝土抗渗性与抗裂性作为提高混凝土结构耐久性的主要技术途径,可采用降低水胶比方法提高抗渗性,采用添加纤维方法提高抗裂性,并指出隧道施工过程的质量控制和运营期的维修养护对提高隧道结构耐久性的重要性.根据龙头山隧道现场条件,预测了衬砌结构的寿命,结果表明能满足100年的设计要求.

关键词: 隧道结构, 耐久性, 配合比优化, 寿命预测, 维修养护

Abstract: The lining structure’s durability was studied for the Longtou Mountain large span road tunnel in Guangzhou. Based on the environment and the groundwater analyses, it was concluded that the lining structure is in type I environment and the environment influence is classified as I-B. Therefore, the reinforcement corrosion caused by the concrete carbonization is regarded as the main durability degeneration method. Due to the large span, there is high tensile stress inside the tunnel arch part, which adapts to produce cracks and can greatly accelerate the speed of concrete degeneration. The factors that caused concrete durability problems were particularly analyzed and the mix proportion of concrete was optimized. The results show that the main technical method is to deduce the water-binder ratio to improve the antiosmosis ability and to add fiber to improve the anti-cracking ability. It is also emphasized that quality control during the construction and maintenance and curing in the operation period are crucial for tunnel durability. According to the on-site situation of the Longtou Mountain tunnel, the predicted lining life is over 100 years, which meets the design criterion.

Key words: tunnel lining structure, durability, mix proportion optimization, life prediction, Maintenance and curing

中图分类号:

谭忠盛,黄成造 ,刘恒,朋改非 . 大跨公路隧道结构耐久性分析[J]. 山东大学学报(工学版), 2008, 38(3): 18-22 .

TAN Zhong-sheng,HUANG Cheng-zao,LIU Heng,PENG Gai-fei . Durability analysis of large span road tunnels[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2008, 38(3): 18-22 .

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