多年冻土区隧道衬砌混凝土冻融循环试验研究  

Test and Research on Freeze-thaw Cycle of Tunnel Lining Concrete in Permafrost Regions

作　　者：董长松[1] 张晓旭[1] 张弛 黎岩[3] 

机构地区：[1]中交第一公路勘察设计研究院有限公司,西安市710075 [2]北京城建设计发展集团股份有限公司,西安市710016 [3]同济大学,上海市20092

出　　处：《公路》2015年第11期244-247,共4页Highway

摘　　要：多年冻土区隧道衬砌混凝土容易受到冻融循环作用而发生冻胀破坏,威胁隧道结构安全和使用寿命。针对依托工程衬砌混凝土配合比进行了冻融循环试验,得到混凝土质量、相对动弹模量、劈裂抗拉强度和抗压强度随冻融循环次数的变化规律,并拟合了函数关系;分析了混凝土力学性能变化规律和内在原因;为提高多年冻土区隧道衬砌混凝土抗冻耐久性提出了建议。Tunnel lining concrete in permafrost regions is vulnerable to be damaged because of freeze- thaw cycle, which is threatening the safety and life of tunnel structure. Based on the mix proportion adopted by relying project, the freeze-thaw cycle experiment has been conducted, the change rule of concrete＇s quality, relatively dynamic elastic modulus, tensile splitting strength and compressive strength along with freeze-thaw has been concluded, the function relationship has been matched. The change law and internal cause of concrete＇s mechanical performance has been analyzed. Suggestions on how to enhance the freeze-proof durability of lining concrete in permafrost regions have been put forward.

关 键 词：多年冻土区 衬砌混凝土 冻融循环 抗冻耐久性 力学性能 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]