自然条件下隧道衬砌浅层钢筋锈蚀的热效应与红外检测方法  

Thermal effects and infrared detection method for shallow reinforcement corrosion in tunnel linings under natural conditions

作　　者：刘学增[1] 杨学良 杨芝璐 李振 杨子硕 LIU Xuezeng;YANG Xueliang;YANG Zhilu;LI Zhen;YANG Zishuo(College of Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Tongyan Civil Engineering Technology Co.,Ltd.,Shanghai 200092,China;Shanghai Engineering Reseach Center of Underground Infrastructure Detection and Maintenance Equipment,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海同岩土木工程科技股份有限公司,上海200092 [3]上海地下基础设施安全检测与养护装备工程技术研究中心,上海200092

出　　处：《岩土工程学报》2023年第4期680-689,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52278409);上海市人才发展资金项目(2021051);贵州省科学技术厅重大科技专项(黔科合重大专项字[2018]3011)。

摘　　要：隧道随着服役年限增加,衬砌渗漏水、开裂等病害已成常态,由此造成的钢筋锈蚀逐渐显现,钢筋锈蚀一定程度后将引起衬砌剥离剥落,因此,及时发现钢筋锈蚀程度及位置尤为重要。通过室内试验和数值模拟研究了自然温差条件下钢筋锈蚀衬砌的热传导规律,分析了衬砌内外温差、钢筋锈蚀程度对衬砌内表面温度分布的影响规律,探索了红外热成像技术检测衬砌浅层钢筋锈蚀的可行性和适用条件。结果表明:①衬砌内外温差1.0℃~11.9℃时红外检测具有可行性,冬季时衬砌内外温差可满足条件;钢筋锈蚀率为6.51%,19.02%和23.16%时红外检测所需的最小温差为3.8℃,1.8℃和1.4℃。②衬砌钢筋锈蚀率(ρ)与二次衬砌内表面温差(T_(1))、二次衬砌内外温差(T_(2))的关系式为ρ=1.1×10^(5)T_(2)^(-3.2)T_(1)^(3)+503.7T_(2)^(0.9T_(1))。衬砌内外温差为3~30℃时可检测的钢筋锈蚀率为9.78%~1.18%。③通过衬砌内外温差而产生的热传导效应,依据衬砌内表面温度分布可以综合判断钢筋锈蚀位置与锈蚀程度,为隧道衬砌浅层钢筋锈蚀提供了新的快速检测方法。With the increase of the service life of the tunnel,the diseases such as water leakage and cracking of the linings have become normal,and the induced reinforcement corrosion gradually emerges.After the reinforcement corrosion to a certain extent,the linings will peel off.Therefore,it is particularly important to discover the corrosion degree and position of reinforcement in time.The heat conduction laws of reinforcement corrosion of the linings under the natural temperature difference are studied through the laboratory tests and numerical simulations,the influence laws of temperature difference inside and outside the linings and the degree of reinforcement corrosion on the inner surface temperature distribution of the linings are analyzed,and the feasibility and applicable conditions of infrared thermography technology for detecting the corrosion of the shallow reinforcement corrosion of the linings are explored.The results show that:(1)The infrared detection is feasible when the temperature difference inside and outside the linings is 1.0℃~11.9℃,and the temperature difference inside and outside the linings can meet the conditions in winter.The minimum temperature difference required by the infrared detection is 3.8℃,1.8℃and 1.4℃when the corrosion rate of reinforcement is 6.51%,19.02%and 23.16%.(2)The relationship among the corrosion rate of lining reinforcement(ρ),the temperature difference of inner surface of the secondary linings(T_(1))and the temperature difference between the inner and outer surfaces of the secondary linings(T_(2))isρ=1.1×10^(5)T_(2)^(-3.2)T_(1)^(3)+503.7T_(2)^(0.9T_(1)).When the temperature difference inside and outside the lining is 3℃~30℃,the detectable corrosion rate of reinforcement is 9.78%~1.18%.(3)Through the heat conduction effect caused by the temperature difference inside and outside the linings,the position and degree of reinforcement corrosion can be comprehensively judged from the temperature distribution on the inner surface of the linings,which provides a new

关 键 词：隧道衬砌 钢筋锈蚀 红外检测 室内试验 数值分析 

分 类 号：TU411[建筑科学—岩土工程]