CAJ | 학술논문

用复合腔体加固体加固隧道结构是一种新型的加固方法，为了掌握火灾高温后复合腔体加固盾构隧道后界面的粘结性能，开展了50～400℃高温处理后粘结剂力学性能试验和混凝土立方体试件-复合腔体界面双面剪切试验。试验结果表明：1）在较低温度条件下，温度升高能优化粘结剂的力学性能；在较高温度下，粘结剂的力学性能随着温度的升高而降低，粘结剂的力学性能在150℃温度条件下最优，在超过300℃温度条件下，力学性能几乎失效。2）高温后混凝土-复合腔体界面破坏形式分为A，B，C 3种类型，混凝土-复合腔体界面的剪切刚度随着温度的升高而降低；混凝土-复合腔体界面粘结性能的最佳工作温度TP在50℃左右，完全失效温度Tf为300～400℃，在较低温度（15℃和50℃）、较高温度（100℃和200℃）和高温（250℃～Tf）条件下，影响混凝土-复合腔体界面粘结性能的主要因素分别是混凝土的剪切强度、碳纤维布-钢管界面的粘结性能和混凝土-粘结剂界面的粘结性能。
용복합강체가고체가고수도결구시일충신형적가고방법，위료장악화재고온후복합강체가고순구수도후계면적점결성능，개전료50～400℃고온처리후점결제역학성능시험화혼응토립방체시건-복합강체계면쌍면전절시험。시험결과표명：1）재교저온도조건하，온도승고능우화점결제적역학성능；재교고온도하，점결제적역학성능수착온도적승고이강저，점결제적역학성능재150℃온도조건하최우，재초과300℃온도조건하，역학성능궤호실효。2）고온후혼응토-복합강체계면파배형식분위A，B，C 3충류형，혼응토-복합강체계면적전절강도수착온도적승고이강저；혼응토-복합강체계면점결성능적최가공작온도TP재50℃좌우，완전실효온도Tf위300～400℃，재교저온도（15℃화50℃）、교고온도（100℃화200℃）화고온（250℃～Tf）조건하，영향혼응토-복합강체계면점결성능적주요인소분별시혼응토적전절강도、탄섬유포-강관계면적점결성능화혼응토-점결제계면적점결성능。
Applying new composite to reinforce the segments of shield tunnel is a new reinforcement method.This paper focuses on the mechanical behavior of the binder and the shear properties of the interface between C50 concrete cube and the new composite structure after exposure to high temperature (50~400 ℃).The experiment results indicate that:1 ) The mechanical behavior of the binder improves in relatively low temperature condition,however,the mechanical behav-ior of the binder reduces in relatively high temperature condition when the temperature increases;The optimum tempera-ture of the binder is 150 ℃;The binder completely fails after exposure to a temperature over 300 ℃;2)The failure of the interface between the C50 concrete cube and the new composite structure can be divided into 3 types;The optimum temperature Tp of the interface is about 50℃and the failure temperature Tfis between 300℃and 400℃;The shearing stiffness of the interface reduces when the temperature increases;Major factors affecting the shear properties of the inter-face after exposure to relatively low temperature(15,50 ℃),relatively high temperature(100,200 ℃)and high temper-ature (250 ℃~Tf)include the shear strength of the concrete,the bond property between the CFRP and the steel tube, and the bond property between the binder and the concrete.