【作者】 王杨；

【导师】 陈铁林；

【作者基本信息】 北京交通大学 ， 土木工程， 2017， 硕士

【摘要】 随着我国隧道工程技术的不断进步与发展,中国是目前世界上隧道和地下工程数量最多、发展速度最快、地质及结构形式最复杂的国家,现在所面临的一大问题即大量隧道已经进入了 "养护维修"阶段,经过长期运营,部分隧道出现了衬砌开裂、渗漏水、衬砌背后空洞等明显病害,危及行车安全。而二次衬砌作为隧道的主要结构,其技术状况对隧道运营安全至关重要,所以隧道二次衬砌的加固技术也成为隧道加固的一项核心内容。FRP-纤维增强复合材料,是由纤维材料与基体材料按一定的比例混合后形成的高性能型材料,因其优越的力学性能现正被广泛的应用于桥梁工程、各类民用建筑、海洋工程、地下工程中。纤维复合材料简称"FRP"由于其质量轻、高强、耐腐蚀性好等优点,使FRP材料在土木工程加固领域应用越来越广泛。FRP加固补强技术因其施工方便快捷、不增加结构自重、耐腐蚀等特点与传统加固方法相比有突出优点,尤其是嵌入式加固技术,充分的提高了 FRP的利用率和加固效率。本文对嵌入式FRP隧道二衬加固技术的研究主要集中在加固后的抗弯承载力、FRP与混凝土之间粘结滑移性能研究以及裂缝理论分析,主要研究内容及成果如下:(1)基于应力-应变软化模型,运用数值模拟的方法,研究FRP复合材料在二次衬砌中的粘结效应,描述其破坏过程及类型,分析材料参数、接触面参数等对最终破坏模式、粘结强度的影响及原理分析,同时分析接触面相关特性,对合理选择加固材料参数提供依据。(2)研究FRP嵌入式加固对二次衬砌混凝土抗弯承载力的影响,对隧道二次衬砌结构在向心均布荷载下进行受力分析,分析衬砌结构破坏过程、变形特性及FRP材料的变形特性、应力状态,并对比FRP嵌入式加固之后结构整体的抗弯承载力的变化。(3)研究FRP复合材料加固的加固范围、加固方式及开槽尺寸对最终加固效果的影响,包括破坏模式、变形特性及承载力的变化。更多还原

【Abstract】 With the constant progress and development of tunnel engineering in our country,China is the largest number of tunnel and underground engineering in the world,with the fastest developing speed,the most complicated geological and structural form of country,we have to face a big problem that a large number of tunnel has entered the stage of "maintenance",after a long-term operation,part of the tunnel in the hole behind the lining crack,water leakage,lining and so on obvious diseases,endangering the safety of traffic.And secondary lining as the main structure of the tunnel,is very important for the technology condition of tunnel operation safety,so the tunnel secondary lining reinforcement technique has become a core content of tunnel reinforcement.FRP-fibre reinforced composite material,is made up of fiber and matrix materials mixed in certain proportion after the formation of the type of high performance material,because of its superior mechanical properties are widely used in bridge engineering,various types of’ civil construction,Marine engineering,and underground engineering.Fiber composite materials referred to as "FRP" due to its advantages of light weight,high strength,good corrosion resistance,the FRP material is finding wider and wider application in the field of’ civil engineering reinforcement.FRP reinforcement technology is convenient and quick,do not increase the weight of structure and corrosion resistance and other characteristics compared with the traditional strengthening methods have prominent advantages,especially the embedded reinforcement technology,fully improve the efficiency of the utilization of FRP and reinforcement.In this paper the embedded FRP tunnel second lining reinforcement technology research mainly focus on flexural bearing capacity of the reinforced,bond slip behavior between FRP and concrete research and theoretical analysis of crack the main research contents and results were as follows:(1)based on the stress and strain softening model,by using the method of numerical simulation research of FRP composite material in the second lining of the bonding effect,describe the failure process and type,analysis of material parameters and the parameters of the contact area on the final failure pattern,the effects of bond strength and the principle analysis,analysis interface related characteristics at the same time,to provide basis for selecting reasonable reinforcement material parameters.(2)the research of FRP embedded reinforcement of secondary lining concrete flexural bearing capacity,the influence of the tunnel secondary lining structure in the centripetal force analysis under uniformly distributed load,analyzes the characteristics of deformation and failure process,comparing with FRP embedded reinforcement after the change of the flexural bearing capacity of structure as a whole.(3)the research of FRP composites reinforcement scope of reinforcement,reinforcement method and slot size effect on the final reinforcement effect,including failure modes,deformation characteristics and the change of bearing capacity.更多还原