【作者】 张素磊；

【导师】 张顶立；

【作者基本信息】 北京交通大学 ， 地下工程， 2012， 博士

【摘要】 摘要：隧道衬砌结构健康诊断是一项亟需开展的课题。本文在广泛查阅国内外相关文献资料的基础上,通过理论分析、数值计算、室内相似模型试验和现场检测相结合的技术手段对隧道衬砌结构病害主成因、运营隧道常见质量缺陷和常见病害的一般规律、衬砌背后空洞和衬砌裂缝对隧道结构安全性的影响规律以及隧道衬砌结构技术状况评定等几项内容进行了深入研究。主要研究工作和研究结论如下：(1)针对目前隧道工程界对隧道质量缺陷与隧道病害概念混淆的现状,建立了隧道质量缺陷和隧道病害的基本概念,并分析了两者的区别与联系。(2)根据隧道衬砌结构病害及成因的调查资料,提出了基于对应分析模型的隧道衬砌结构病害主成因挖掘方法,为隧道衬砌结构病害主成因的分析提供了一种新的研究方法；实例分析的结果表明,导致隧道衬砌结构产生病害的主成因为衬砌背后空洞、衬砌厚度不足、围岩处理不当和塑性地压4个因素。(3)对宁波地区国省道隧道的现场检测数据进行了统计分析,获取了运营隧道衬砌强度和碳化深度、衬砌厚度、衬砌背后空洞特征以及衬砌裂缝特征等常见隧道质量缺陷和隧道病害的一般规律。(4)基于理论分析、数值计算和室内模型试验等研究方法对衬砌背后空洞的致害性机理进行了系统研究,具体研究成果如下：①基于平面弹性复变函数的基本理论推导了考虑衬砌背后空洞影响的围岩应力及位移的理论计算公式；②通过数值计算研究了不同侧压力系数条件下不同位置和不同范围衬砌背后空洞对隧道衬砌结构安全性的影响规律；③通过室内相似模型试验模拟了素混凝土衬砌结构和钢筋混凝土衬砌结构背后存在不同位置、不同范围空洞时隧道衬砌结构的变形特征、受力特点和破坏模式,获取的试验结果可为隧道现场检测与维修加固工作提供借鉴。(5)基于小波变换、灰色理论和突变理论建立了针对隧道衬砌裂缝监测数据的衬砌裂缝稳定性判据和一般分析流程,为隧道衬砌裂缝现场检测数据的科学分析提供了一种新的方法；基于混凝土断裂力学建立了隧道衬砌结构已有裂缝的稳定性判据和一般分析流程,并通过工程实例验证了两种方法研究隧道衬砌结构裂缝稳定性的有效性。(6)针对目前隧道工程界已有的隧道衬砌结构技术状况评定方法存在的不足,本文给出了“隧道健康度”的科学内涵,并通过隧道健康度函数建立了隧道现场检测数据和评定结果之间的量化关系,提出了一种基于现场检测数据的隧道衬砌结构技术状况分段式量化评定方法。更多还原

【Abstract】 ABSTRACT:Tunnel lining structure health diagnosis is a subject to be carried out urgently. Based on widely reviewing related literatures both home and abroad, main causes for tunnel lining structure, common tunnel quality defects and damages laws, influences of voids behind lining and lining cracks on tunnel structure safety, and technical condition assessment for tunnel lining structure are deeply studied by combination method of theory analysis, numerical calculation, similarity model test and field testing. Main research work and research results are as follows:(1) According to present situation of the conception obscure between tunnel quality defect and tunnel damage in tunnel engineering, the common conception of tunnel quality defect and tunnel damage is given and the difference and connection are also analyzed in this paper.(2) According to the tunnel lining damage and cause survey data, the method for discovering the main causes of tunnel lining structure damage is put forward basgd on correspondence analysis model, which provides a new study method for the study of the main causes of tunnel lining structure damage. The analysis results show that the main causes are cavities behind the lining, insufficient lining thickness, misconduct of the surrounding rock and plastic ground pressure.(3) The general laws of common quality defects and damages, sunch as tunnel lining strength, carbonation depth, lining thickness, features of voids behind lining, features of lining cracks, etc, are obtained based on the statistical analysis of field test data of state road and provincial road tunnels in Ningbo.(4) Harm mechanism of voids behind lining are studied based on theory analysis, numerical calculation and similarity model test. The specific research contents are as follows:①The stress status and displacement theoretical calculation formulae of surrounding rock influenced by voids behind lining are deduced based on planar elastic function of complex variable method.②Influence laws of voids behind lining on lining structure safety under different lateral pressure coefficients, different locations and different ranges are analyzed based on numerical calculation.③The deformation characteristics, mechanical characteristics and failure modes of plain concrete and reinforced concrete linings under different locations and different ranges are simulated based on indoor similarity model test. The test results can provide references for tunnel site detection and repair and reinforcement. (5) Be aimed at tunnel lining crack monitoring data, lining crack stability criterion and judgment process are established based on wavelet transform, gray theory and catastrophe theory, which provides a new method for the scientific analysis of the tunnel lining crack monitoring data. Lining crack stability criterion and judgment process for existing cracks in tunnel lining are established based on concrete fracture mechanics. And the effectiveness of the two study methods for tunnel lining crack stability is verified by case study.(6) According to the insufficiencies of existing tunnel lining technical condition assessment method in tunnel engineering circle, the scientific conception of tunnel health degree is put forward in this paper. The quantified relations between tunnel site detection data and assessment results is established by tunnel health degree function and A segmented and quantified tunnel lining technical condition assessment method based on field measurable parameters is also established.更多还原