隧道运行中汽车尾气、扬尘、油污不易降解，越积越多，导致隧道严重污染，影响行车安全，定期进行隧道清洗是隧道安全运行的重要保证。研究了一种利用干冰清洗隧道的方法，基于二氧化碳物化性质和干冰清洗特点建立了隧道干冰清洗理论模型，对干冰清洗时混凝土表面孔隙、表面温度、混凝土单轴抗压强度及清洗效果进行试验，分析了干冰清洗对混凝土表面损伤和抗压强度的影响。试验结果表明：干冰清洗能彻底清除混凝土表面污秽物；清洗过程中的温度变化、干冰微爆对混凝土表面及强度影响较小。干冰清洗技术可用于隧道清洗。

Vehicle exhaust，dust and grease in tunnels are hard to be degraded，thus there will be more and more pollutants and the traffic safety will be influenced. Therefore，regularly cleaning tunnels is important for guaranteeing the traffic safety in tunnels. A tunnel cleaning method with dry ice is proposed，and a model of dry ice cleaning tunnel is developed based on the physical，chemical and cleaning properties of dry ice. Some experiments about the surface hole，surface temperature and the uniaxial compressive strength of the concrete are conducted. The surface damage and the compressive strength of the concrete is researched after the cleaning process. The test results show that：the dry ice cleaning method can thoroughly clean the surface of concrete；the surface damage and the compressive strength is little influence by the temperature and dry ice micro blasting. So dry ice cleaning method can be used for cleaning tunnel.

国家重点基础研究发展计划(973 计划)项目(2009CB724606)；国家自然科学基金资助项目(51074198)；国家创新研究群体基金资助项目(50621403)，重庆市科委自然科学基金计划资助项目(2010BB6044)；中央高校基本科研业务费资助项目(CDJZR10240017)