高填土大跨径钢波纹管涵的力学性能与设计方法研究

发布时间：2018-06-29 15:01

本文选题：高填土 + 大跨径　；参考：《湖南大学》2014年硕士论文

【摘要】：目前的涵洞主要是钢筋混凝土结构，但由于施工繁琐、工期长，而且在使用的过程中会经常出现混凝土板开裂、基础沉降等病害，，尤其在高填土路基下更为明显，严重影了响结构的正常使用和交通运输安全。因此寻找一种施工简单、承载力强且又经济适用的结构成为工程技术人员的重要任务。钢波纹管涵结构有效地避免钢筋混凝土结构缺点和不足，该结构有着以下几方面的优势：（1）结构承载能力大，抗变形能力和基础适应能力强；（2）施工速度快，能大幅缩短工期；（3）与混凝土结构相比造价低，管径越大越经济。本文主要研究内容及成果如下：（1）采用ANSYS有限元建模方法对钢波纹管涵洞进行了数值计算，分析结构在不同施工工况、不同参数、恒活载作用以及地基沉降下的受力特点、变形规律和周围土压力变化情况，结果表明：波纹大小对管涵性能都有一定的影响，板厚主要影响结构受力，填土模量对受力和变形影响都较大。当管顶填土达到14m以上时，管涵的受力和变形明显变缓，活载在管顶填土达到9m左右时可以忽略不计。不对称回填在填土的初始阶段对钢波纹管涵结构的影响最大。一定范围内的地基沉降对管涵的影响不是很大，说明管涵适应地基的能力良好；（2）对高填土下的钢波纹管涵进行现场试验力学性能研究，研究钢波纹管涵在施工阶段的受力和变形变化规律。试验结果表明：管顶填土将形成土拱效应，并随着填土高度的增加逐渐变大，有效地缓解了结构受力和变形的变化，有利于改善结构受力状况；（3）将有限元计算结果与实测数据作对比，结果表明计算结果与试验数据吻合度较好，误差基本满足要求，并通过分析总结提出合理的工程设计方法和施工建议，比如波形的选择，管涵环向拼装缝位置的设计等；（4）通过研究对比国内外各种钢波纹管涵规范，结合工程的实际情况，对现有的钢波纹管设计计算公式进行修正、优化，为国内对钢波纹管涵的设计研究提供一定的参考价值。
[Abstract]:At present, the culvert is mainly reinforced concrete structure, but because the construction is tedious, the construction period is long and the concrete slab cracking and foundation settlement will often occur in the process of using, especially under the high fill subgrade, it is more obvious. A serious impact on the normal use of the structure and traffic safety. Therefore, it is an important task for engineers to find a structure with simple construction, strong bearing capacity and economic applicability. The steel corrugated pipe culvert structure effectively avoids the shortcomings and shortcomings of the reinforced concrete structure. The structure has the following advantages: (1) the bearing capacity of the structure is large, the ability of resisting deformation and the adaptability of the foundation are strong; (2) the construction speed is fast, and the construction period can be greatly shortened. (3) compared with the concrete structure, the cost is lower, and the bigger the pipe diameter is, the more economical it is. The main contents and results of this paper are as follows: (1) the numerical calculation of steel bellows culvert is carried out by using ANSYS finite element modeling method, and the structure is analyzed under different construction conditions and different parameters. The effect of dead load, the stress characteristics of foundation settlement, the law of deformation and the variation of surrounding earth pressure show that the corrugation size has certain influence on the performance of pipe culvert, and the thickness of plate mainly affects the stress of the structure. The modulus of fill has a great effect on stress and deformation. When the pipe top fill reaches more than 14 m, the stress and deformation of the pipe culvert become slower obviously, and the live load can be ignored when the pipe top fill reaches about 9 m. Asymmetric backfill has the greatest influence on steel bellows culvert structure in the initial stage of filling. The influence of foundation settlement in a certain range on pipe culvert is not very great, which indicates that the capacity of pipe culvert to adapt to foundation is good. (2) the mechanical properties of steel corrugated pipe culvert under high fill are studied in situ. The law of stress and deformation of corrugated steel pipe culvert in construction stage is studied. The test results show that the soil arch effect will be formed on the top of the pipe, and the soil arch effect will become larger with the increase of the filling height, which can effectively alleviate the changes of the structure stress and deformation, and is beneficial to the improvement of the structure stress condition. (3) comparing the finite element calculation results with the measured data, the results show that the calculation results are in good agreement with the test data, and the errors basically meet the requirements. The reasonable engineering design methods and construction suggestions are put forward through analysis and summary. For example, the selection of the waveform, the design of the position of the pipe circumferential assembling joint, etc. (4) through the research and comparison of various steel corrugated pipe culvert codes at home and abroad, combined with the actual situation of the project, the existing formulas for the design and calculation of the steel corrugated pipe are revised. The optimization provides a certain reference value for the design of steel bellows culvert in China.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U449.1

【参考文献】