岩溶地区长大深埋运营隧道病害评估与防治对策研究

发布时间：2018-04-18 08:09

本文选题：公路隧道 + 衬砌病害　；参考：《重庆大学》2014年硕士论文

【摘要】：近年来，我国基础设施建设取得了迅猛发展，高速公路建设总里程不断增大。随着我国公路建设项目的不断增多，隧道建设也取得了丰硕的成就，但建设也显现出一些问题，一些隧道刚竣工即出现大量的衬砌病害问题。这些病害的出现一方面与隧道工程的模糊性和复杂性有关，另一方面也与隧道的施工技术和质量控制有关系。论文以西南地区某高速公路隧道的设计和检测资料为基础，，对隧道衬砌厚度病害、空洞病害及衬砌裂缝进行研究分析，主要研究内容和成果如下： ①对隧道进行了现场调研和检测工作，详细分析了隧道的检测和设计资料，对隧道病害进行统计分类。 ②运用ANSYS软件分析了衬砌厚度病害在III级、IV级和V级围岩中对结构稳定性的影响，得出衬砌厚度与结构安全系数、弯矩、轴力和剪力的关系，认为衬砌结构的安全系数、弯矩、轴力、剪力在II~V级围岩中的变化规律基本一致，衬砌结构较危险截面位于衬砌的拱顶、拱腰和边墙墙脚部位。 ③通过数值计算分析衬砌背后空洞病害在III级和IV级围岩中对结构稳定性的影响，得出衬砌结构最大拉应力与空洞宽度、空洞高度及空洞面积的变化规律，认为空洞尺寸的变化在III级围岩中导致的衬砌结构上的最大拉应力的增幅大于IV级围岩，空洞宽度改变对衬砌结构最大拉应力的影响较空洞高度改变的影响大。 ④通过对隧道衬砌裂缝的评估方法进行分析，提出了便于现场检测判别的衬砌单条裂缝的评定方法和整座隧道衬砌裂缝“最不利原则”综合评定法。 ⑤从隧道施工的角度分析了衬砌厚度病害、空洞病害的产生原因，从围岩变形和衬砌本身缺陷分析了衬砌裂缝的成因，认为隧道衬砌厚度病害和空洞病害与隧道施工过程质量控制有密切的关系，衬砌结构存在缺陷时结构的弯张作用与剪切作用常导致结构发生受拉裂缝和错台裂缝。并据此提出了隧道病害相应的预防和处治措施。
[Abstract]:In recent years, the construction of infrastructure in China has made rapid development, the total mileage of highway construction is increasing.With the increasing number of highway construction projects in our country, the tunnel construction has made a lot of achievements, but the construction also shows some problems, some tunnels have a large number of lining problems as soon as they have been completed.The emergence of these diseases is related to the fuzziness and complexity of tunnel engineering on the one hand and the construction technology and quality control of tunnel on the other.Based on the design and inspection data of a highway tunnel in southwest China, this paper studies and analyzes the diseases of tunnel lining thickness, cavities and cracks. The main research contents and results are as follows:The main contents are as follows: (1) the site investigation and inspection work of tunnel are carried out, the detection and design data of tunnel are analyzed in detail, and the tunnel diseases are classified statistically.2 the influence of lining thickness disease on structural stability in III grade IV and V surrounding rock is analyzed by using ANSYS software. The relationship between lining thickness and structural safety factor, moment, axial force and shear force is obtained, and the safety factor and bending moment of lining structure are considered.The variation law of axial force and shear force in II~V grade surrounding rock is basically the same, and the dangerous section of lining structure is located at the arch top, arch waist and side wall foot of lining.(3) through numerical calculation, the influence of cavity disease on structural stability in III class and IV grade surrounding rock is analyzed, and the variation law of maximum tensile stress and cavity width, cavity height and cavity area of lining structure are obtained.It is considered that the maximum tensile stress of lining structure caused by the change of cavity size in III grade surrounding rock is larger than that of grade IV surrounding rock, and the influence of the change of cavity width on the maximum tensile stress of lining structure is greater than that of cavity height change.Through the analysis of the evaluation method of tunnel lining crack, this paper puts forward the evaluation method of single crack of lining and the comprehensive evaluation method of "the most unfavorable principle" of the crack of the whole tunnel lining.5. From the angle of tunnel construction, the causes of lining thickness diseases and cavities are analyzed, and the causes of lining cracks are analyzed from the deformation of surrounding rock and the defects of lining itself.It is considered that the defects of tunnel lining thickness and cavity are closely related to the quality control of tunnel construction process. When there are defects in lining structure, the flexural and shearing actions often lead to tensile cracks and staggered platform cracks.Based on this, the corresponding prevention and treatment measures of tunnel diseases are put forward.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U457.2

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