高速公路涵洞加宽新旧涵拼接处受力与变形特性分析及工程技术研究
发布时间：2018-07-13 09:51
【摘要】：目前国内高速公路改扩建工程实用技术规范和标准尚不成熟,且针对涵洞加宽工程的系统性研究较少,涵洞加宽工程相关技术问题的研究正在引起学术界及工程技术人员的关注。本文在总结国内外高速公路涵洞加宽工程研究成果的基础上,结合惠深高速公路涵洞加宽工程实例,通过实地调研、数值仿真计算、理论分析,对涵洞加宽工程中新旧涵拼接处受力与变形特性、涵洞加宽设计方法及施工技术进行了研究。主要研究成果如下:1.利用有限元数值仿真方法,计算分析两种拼接方法下,不同工况时新旧涵拼接处受力与变形特性情况,结果表明:新旧涵采用植筋拼接时,新涵对旧涵的不利影响较沉降缝拼接时明显要大,且随着加宽跨径和涵顶填土高度的增大,不利影响程度也逐渐增大;当加宽跨径超过4m或涵顶填土高度超过2m时,拼接处旧涵盖板跨中下缘拉应力超过混凝土抗拉强度设计值,涵洞结构会发生破坏。而新旧涵采用沉降缝拼接时,拼接处盖板跨中下缘拉应力较植筋拼接时明显要小,且新旧涵基础沉降差较小,满足控制标准要求。2.在新旧涵基础沉降差满足要求情况下,对盖板涵和箱涵,当加宽跨径超过4m或涵顶填土高度超过2m时,建议新旧涵采用沉降缝拼接;其他情况时,为使新旧涵结构拼接紧密,可采用植筋拼接。对圆管涵和拱涵,可分别采用沉降缝拼接和新建盖板涵拼接。3.单侧加宽时,新旧涵拼接处盖板跨中下缘正应力较两侧加宽时明显要大,建议涵洞加宽应优先采用两侧加宽。地基处理选用合理的桩基几何参数,新涵基础选用整体式基础且结构尺寸适当增大,确保新旧涵基础沉降差满足要求,且涵洞结构不受破坏。4.系统总结了高速公路涵洞加宽工程施工技术要点,提出了减小新旧涵基础沉降差工程措施、涵洞加宽施工质量检测方法及控制标准。论文研究成果一方面弄清了不同拼接方法下新旧涵拼接处受力与变形特性情况,为新旧涵相互作用研究提供了理论依据;另一方面为高速公路涵洞加宽工程设计方法与施工技术提供了科学借鉴,具有重要的工程实际意义。
[Abstract]:At present, the practical technical specifications and standards of expressway reconstruction and extension project in China are not mature, and the systematic research on culvert widening project is less. The research of culvert widening engineering technology is attracting the attention of academic circles and engineers. On the basis of summing up the research results of highway culvert widening engineering at home and abroad, this paper combines with the practical example of the culvert widening project of Hui-Shen Expressway, through field investigation, numerical simulation and theoretical analysis. The stress and deformation characteristics of new and old culvert joints in culvert widening engineering, the design method and construction technology of culvert widening are studied. The main research results are as follows: 1. The finite element numerical simulation method is used to calculate and analyze the stress and deformation characteristics of the new and old culvert joints under different working conditions. The results show that when the new and old culverts are jointed with steel bars, The adverse effect of the new culvert on the old culvert is obviously greater than that of the settlement joint, and with the increase of the width span and the height of the culvert top fill, the adverse influence degree increases gradually, and when the width span is more than 4m or the culvert top fill height is more than 2m, When the tensile stress of the middle and lower edge of the old covered slab is higher than the design value of the concrete tensile strength, the culvert structure will be destroyed. When the new and old culverts are jointed by settlement joint, the tensile stress of the middle and lower edge of the cover at the joint is obviously smaller than that of the planting reinforcement, and the settlement difference between the new and the old culvert foundation is smaller, which meets the control standard. When the settlement difference between new and old culverts meets the requirement, when the span of cover culvert and box culvert is more than 4m or the height of culvert top fill is more than 2m, it is suggested that the new culvert and old culvert should be jointed by settlement joint; in other cases, in order to make the structure of new culvert and old culvert close, The splicing of planting bars can be used. For circular pipe culvert and arch culvert, settlement joint splicing and new cover plate culvert splicing. 3. When the width of the new and old culvert is widened, the normal stress of the middle and lower edge of the cover at the new and old culvert joint is obviously larger than that of the two sides. It is suggested that the widening of culvert should be given priority to both sides. Reasonable geometric parameters of pile foundation are selected for foundation treatment and integral foundation is used for new culvert foundation and the structure size is increased appropriately to ensure that the settlement difference between new and old culvert foundation meets the requirement and the culvert structure is not damaged .4. The main points of construction technology for culvert widening project of expressway are summarized systematically. The engineering measures to reduce the settlement difference between new culvert foundation and old culvert foundation, the quality detection method and control standard of culvert widening construction are put forward. On the one hand, the paper makes clear the stress and deformation characteristics of the new and old culverts under different splicing methods, which provides a theoretical basis for the study of the interaction between the new and the old culverts. On the other hand, it provides scientific reference for highway culvert widening engineering design method and construction technology, which has important engineering practical significance.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U449
本文编号：2118965
[Abstract]:At present, the practical technical specifications and standards of expressway reconstruction and extension project in China are not mature, and the systematic research on culvert widening project is less. The research of culvert widening engineering technology is attracting the attention of academic circles and engineers. On the basis of summing up the research results of highway culvert widening engineering at home and abroad, this paper combines with the practical example of the culvert widening project of Hui-Shen Expressway, through field investigation, numerical simulation and theoretical analysis. The stress and deformation characteristics of new and old culvert joints in culvert widening engineering, the design method and construction technology of culvert widening are studied. The main research results are as follows: 1. The finite element numerical simulation method is used to calculate and analyze the stress and deformation characteristics of the new and old culvert joints under different working conditions. The results show that when the new and old culverts are jointed with steel bars, The adverse effect of the new culvert on the old culvert is obviously greater than that of the settlement joint, and with the increase of the width span and the height of the culvert top fill, the adverse influence degree increases gradually, and when the width span is more than 4m or the culvert top fill height is more than 2m, When the tensile stress of the middle and lower edge of the old covered slab is higher than the design value of the concrete tensile strength, the culvert structure will be destroyed. When the new and old culverts are jointed by settlement joint, the tensile stress of the middle and lower edge of the cover at the joint is obviously smaller than that of the planting reinforcement, and the settlement difference between the new and the old culvert foundation is smaller, which meets the control standard. When the settlement difference between new and old culverts meets the requirement, when the span of cover culvert and box culvert is more than 4m or the height of culvert top fill is more than 2m, it is suggested that the new culvert and old culvert should be jointed by settlement joint; in other cases, in order to make the structure of new culvert and old culvert close, The splicing of planting bars can be used. For circular pipe culvert and arch culvert, settlement joint splicing and new cover plate culvert splicing. 3. When the width of the new and old culvert is widened, the normal stress of the middle and lower edge of the cover at the new and old culvert joint is obviously larger than that of the two sides. It is suggested that the widening of culvert should be given priority to both sides. Reasonable geometric parameters of pile foundation are selected for foundation treatment and integral foundation is used for new culvert foundation and the structure size is increased appropriately to ensure that the settlement difference between new and old culvert foundation meets the requirement and the culvert structure is not damaged .4. The main points of construction technology for culvert widening project of expressway are summarized systematically. The engineering measures to reduce the settlement difference between new culvert foundation and old culvert foundation, the quality detection method and control standard of culvert widening construction are put forward. On the one hand, the paper makes clear the stress and deformation characteristics of the new and old culverts under different splicing methods, which provides a theoretical basis for the study of the interaction between the new and the old culverts. On the other hand, it provides scientific reference for highway culvert widening engineering design method and construction technology, which has important engineering practical significance.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U449
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相关期刊论文 前2条
1 张枫;柳德一;孙德山;;席家泵站新旧涵洞的衔接处理措施[J];水利科技与经济;2010年07期
2 张杨;;公路加宽改建原有涵洞的处治[J];四川建筑;2013年03期
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