公路隧道衬砌裂损机理及结构安全性评价研究
发布时间：2018-07-15 17:11
【摘要】：隧道衬砌结构裂损是隧道修建期间应尽量避免发生的病害,而且是隧道运营阶段养护管理工作防治的重点。本文通过对五十多座隧道进行衬砌裂损病害调查与统计,采用基于混凝土断裂力学理论的扩展有限元法探讨各种诱因下衬砌裂损发展的机理,研究了衬砌结构在裂损存在状态下的受力特性,对衬砌裂损病害进行安全性评估,提出裂损病害安全性评价方法。论文的主要工作及成果有： (1)以隧道裂损病害检测整治项目为依托,介绍衬砌裂损病害现场检测的内容与方法,并通过对五十多座公路隧道衬砌裂损病害现场调查的归纳统计,分析衬砌裂损病害的主要类型与危害,得到隧道衬砌裂损病害的裂缝分布规律以及病害主要诱因。 (2)介绍了断裂力学理论的基本原理,采用基于断裂力学的扩展有限元法对衬砌裂损进行仿真模拟,并结合既有试验研究成果,论证了运用扩展有限元法分析衬砌结构裂损病害的可行性。 (3)对偏压荷载作用、衬砌背后存在空洞、松动压力作用这几种典型诱因下的衬砌结构进行扩展有限元建模分析,探讨衬砌裂损病害的产生机理、裂缝的外观表现形式与扩展规律以及衬砌结构承载力受到的影响。 (4)针对运营隧道,对不同裂损程度的衬砌结构进行对比分析,得到衬砌结构承载力与变形能力的变化规律,在借鉴相关文献的基础上提出隧道衬砌裂损病害的分类标准及结构安全性评价方法。
[Abstract]:The damage of tunnel lining structure is a disease which should be avoided during the construction of tunnel, and it is also the focal point of the maintenance and management work in the period of tunnel operation. Based on the investigation and statistics of lining damage in more than 50 tunnels, this paper discusses the mechanism of lining crack development under various inducements by using the extended finite element method based on the theory of concrete fracture mechanics. In this paper, the stress characteristics of lining structure under the condition of crack are studied, and the safety evaluation method of lining damage is put forward. The main work and achievements of this paper are as follows: (1) based on the project of tunnel crack detection and treatment, the contents and methods of field detection of lining damage are introduced. Through the induction and statistics of more than 50 highway tunnel lining cracks, the main types and hazards of lining cracks are analyzed. The distribution of cracks and the main causes of tunnel lining damage are obtained. (2) the basic theory of fracture mechanics is introduced, and the extended finite element method based on fracture mechanics is used to simulate the crack of lining. Combined with the existing experimental research results, the feasibility of using the extended finite element method to analyze the damage of lining structure is demonstrated. (3) there are voids behind the lining under the eccentric load. The extended finite element modeling analysis of lining structure under the typical inducement of loosening pressure is carried out, and the mechanism of lining crack damage is discussed. The appearance and expansion of cracks and the bearing capacity of lining structures are affected. (4) the lining structures with different cracking degree are compared and analyzed according to the operation of tunnels. The variation law of bearing capacity and deformation capacity of lining structure is obtained. The classification standard of tunnel lining damage and the method of structural safety evaluation are put forward on the basis of reference to relevant literature.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.91
本文编号：2124790
[Abstract]:The damage of tunnel lining structure is a disease which should be avoided during the construction of tunnel, and it is also the focal point of the maintenance and management work in the period of tunnel operation. Based on the investigation and statistics of lining damage in more than 50 tunnels, this paper discusses the mechanism of lining crack development under various inducements by using the extended finite element method based on the theory of concrete fracture mechanics. In this paper, the stress characteristics of lining structure under the condition of crack are studied, and the safety evaluation method of lining damage is put forward. The main work and achievements of this paper are as follows: (1) based on the project of tunnel crack detection and treatment, the contents and methods of field detection of lining damage are introduced. Through the induction and statistics of more than 50 highway tunnel lining cracks, the main types and hazards of lining cracks are analyzed. The distribution of cracks and the main causes of tunnel lining damage are obtained. (2) the basic theory of fracture mechanics is introduced, and the extended finite element method based on fracture mechanics is used to simulate the crack of lining. Combined with the existing experimental research results, the feasibility of using the extended finite element method to analyze the damage of lining structure is demonstrated. (3) there are voids behind the lining under the eccentric load. The extended finite element modeling analysis of lining structure under the typical inducement of loosening pressure is carried out, and the mechanism of lining crack damage is discussed. The appearance and expansion of cracks and the bearing capacity of lining structures are affected. (4) the lining structures with different cracking degree are compared and analyzed according to the operation of tunnels. The variation law of bearing capacity and deformation capacity of lining structure is obtained. The classification standard of tunnel lining damage and the method of structural safety evaluation are put forward on the basis of reference to relevant literature.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.91
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