寒区隧道衬砌混凝土冻融劣化规律及寿命预测研究  

Study on freeze-thaw-action deterioration law and life prediction of concrete in tunnel lining

作　　者：王海彦 刘牛 陈文渊 周敏娟[3] 高少强[3] WANG Haiyan;LIU Niu;CHEN Wenyuan;ZHOU Minjuan;GAO Shaoqiang(College of Transportation Science and Engineering,Nanjing Tech University,Nanjing 211816,China;China Railway Twenty-first Bureau Group Third Engineering Co.,Ltd.,Xianyang 712023,China;Shijiazhuang Institute of Railway Technology,Shijiazhuang 050041,China)

机构地区：[1]南京工业大学交通运输工程学院,江苏南京211816 [2]中铁二十一局集团第三工程有限公司,陕西咸阳712023 [3]石家庄铁路职业技术学院,河北石家庄050041

出　　处：《混凝土》2023年第11期25-28,共4页Concrete

基　　金：国家自然科学基金(52108385)。

摘　　要：依据损伤力学基本理论建立混凝土冻融劣化方程,通过快速冻融试验结果建立了混凝土冻融作用的耐久寿命预测模型,据此预测不同地区隧道衬砌混凝土耐久寿命。针对隧道结构和环境特点,以C40二衬混凝土相对动弹性模量达到50%时混凝土寿命到期的基本原则,预测不同胶凝材料配合比衬砌混凝土在不同地区的耐久寿命,预测结果表明:掺入矿物掺合料后混凝土的抗冻性变差,影响其耐久寿命,建议通过严格控制新拌混凝土的含气量提高复掺矿物掺合料混凝土的抗冻性。The freeze-thaw deterioration equation is carried out according to the basic theories of damage mechanics and rapid freeze-thaw test results,which helps to establish concrete lifetime prediction models of effect of freeze-thaw in different regions as the basis life prediction of concrete.According to tunnel structure and environment characteristics,the durability of concrete with different types of cementing material in different regions is predicted under the basic principle of the concrete life is terminated when C40 secondary lining concrete reaching 50%relative dynamic elasticity modulus.The results show that mineral admixtures makes the frost resistance unacceptable which affects the durability of concrete and strictly controlling the gas content of fresh concrete help to improve frost resistance of combined admixture concrete.

关 键 词：隧道 衬砌混凝土 冻融作用 劣化曲线 寿命预测模型 

分 类 号：TU528.01[建筑科学—建筑技术科学]