严重含盐环境对隧道的危害机理及综合防治技术

Damage Mechanism of Severe Salty Environment to Tunnels andits Comprehensive Control Technology

含盐地层在我国分布广泛且近年来对隧道工程建设影响越来越大,文章依托既有成昆铁路、瓦日铁路、新建成昆铁路永仁至广通段、在建玉磨铁路等盐岩地层隧道工程实例,分析了含盐地层隧道衬砌侵蚀劣化的主要影响因素及衬砌混凝土盐侵蚀劣化机理,并结合现场施工情况提出了严重含盐环境隧道修建关键技术及行之有效的综合防治技术措施,可为类似工程地质条件的隧道工程建设提供借鉴。

Salt-bearing strata are widely distributed in China and have more and more influence on tunnel construction in recent years.Based on the existing engineering projects of salt rock tunnels in the railway lines,such as the Chengdu-Kunming railway,the Watang-Rizhao railway,the newly built Yongren to Guangtong section of Chengdu-Kunming railway and the under constructed Yuxi-Mohan railway,the main factors of erosion deterioration of tunnel lining and salt erosion degradation mechanism of concrete lining are analyzed in this paper.Based on the construction conditions on site,a comprehensive control technology and effective measures are proposed for the tunnels with severe saline environment,which can serve as references for tunnel construction under similar engineering geological conditions.