装配式钢筋混凝土U型渠的耐久性能分析研究

发布时间：2018-11-17 13:13

【摘要】：我国是农业大国,随着农业经济的飞速发展,人们越来越关注如何应用节约资源的高效技术来提升农业生产效益,因而节水灌溉技术逐步发展起来。我国农业灌溉技术相对比较落后,除灌溉方法以及灌溉制度不适合以外,灌溉水渠存在的淤积、渗漏、冻胀破坏等问题严重影响了渠道的耐久性以及使用寿命。落后的灌溉技术严重制约着农业节水灌溉的发展。本文所研究的装配式钢筋混凝土U型渠道,相对于大U型衬砌渠道,渠道不易发生冻胀破坏以及渗透问题,更具有生产标准化、运输安装简易、检修方便等优点,被越来越多的灌区渠道改造以及土地整治工程应用。为研究装配式U型渠道的基本特性、冻胀破坏及使用寿命等耐久性问题,本文以渠道混凝土以及成型渠道作为研究对象,通过理论研究、数值分析、室内试验等方法,探讨研究渠道混凝土的强度特性、抗水渗透特性、抗率氯离子渗透特性以及抗冻性能；模拟渠道的季节性冻胀破坏过程；最后在试验数据的基础上,分析渠道混凝土在碳化条件下和氯离子环境中的使用寿命,旨在探讨装配式钢筋混凝土U型渠在设计使用期内的安全性和适用性。本课题重点开展以下研究工作：1、结合实际工程的生产需要,采取超量取代法计算三组强度等级为C30、初始坍落度为160-180mm的混凝土配合比,并分析拌合物的基本性能。2、通过室内混凝土耐久性试验,对比分析不同配合比的渠道混凝土的强度特性、抗渗透特性(抗水、抗氯离子)及冻融循环特性。3、应用有限元软件模拟梁式渠道和渠式渠道的冻胀破坏过程,对比分析两种渠道温度场、应力场以及位移场等冻胀特征,以研究渠道抗冻胀耐久性能。4、研究U型渠道在碳化条件下及氯离子环境中的寿命准则,分析渠道混凝土的寿命预测方法；根据混凝土耐久性试验结果,完成U型渠道混凝土的碳化寿命预测以及在氯离子环境中耐久性评估。
[Abstract]:China is a big agricultural country. With the rapid development of agricultural economy, people pay more and more attention to how to use the efficient technology of saving resources to improve the efficiency of agricultural production, so the water-saving irrigation technology is gradually developed. The agricultural irrigation technology in China is relatively backward. Besides irrigation method and irrigation system is not suitable, the problems of deposition, leakage and frost heave damage in irrigation canal have seriously affected the durability and service life of the canal. Backward irrigation technology seriously restricts the development of agricultural water-saving irrigation. Compared with the large U lining channel, the prefabricated reinforced concrete U-shaped channel studied in this paper is not easy to be damaged by frost heaving and percolation, and has the advantages of standardization of production, easy transportation and installation, convenient maintenance and so on. By more and more irrigation district canal transformation and land regulation engineering application. In order to study the basic characteristics, frost heaving failure and service life of the prefabricated U-shaped channel, this paper takes the concrete of the channel and the formed channel as the research object, through the methods of theoretical research, numerical analysis, laboratory test, etc. The characteristics of strength, water permeability, chloride ion penetration and freezing resistance of channel concrete are discussed. Simulating the seasonal frost heave failure process of the channel; Finally, based on the experimental data, the service life of channel concrete in carbonation and chloride environment is analyzed. The purpose of this paper is to discuss the safety and applicability of prefabricated reinforced concrete U-shaped canal during its design life. This paper focuses on the following research work: 1. According to the production needs of practical projects, the overdose substitution method is adopted to calculate the concrete mix ratio of three groups of concrete with strength grade C30 and initial slump of 160-180mm, and the basic properties of the mixture are analyzed. 2. Through the durability test of indoor concrete, the strength characteristics, permeability resistance (water resistance, chloride resistance) and freeze-thaw cycle characteristics of channel concrete with different mix ratio were compared and analyzed. The frost heave failure process of beam channel and canal channel is simulated by finite element software. The frost heaving characteristics of the two channels, such as temperature field, stress field and displacement field, are compared and analyzed in order to study the frost heaving durability of the channel. The life criterion of U-shaped channel under carbonation condition and chloride ion environment is studied, and the life prediction method of channel concrete is analyzed. According to the test results of concrete durability, the carbonation life of U-shaped channel concrete and the durability evaluation in chloride environment were completed.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV672;TV334

【参考文献】