本文選題：埋地管道 + 交通荷載　； 參考：《重慶大學(xué)》2016年碩士論文

【摘要】：隨著經(jīng)濟(jì)的高速發(fā)展和城鎮(zhèn)化進(jìn)程的推進(jìn),埋地管道在當(dāng)前社會(huì)中的應(yīng)用已非常廣泛。作為物料運(yùn)輸?shù)囊环N有效手段,埋地管道廣泛應(yīng)用于市政、水利、運(yùn)輸和能源等領(lǐng)域,在現(xiàn)代工農(nóng)業(yè)和人民生活中起著重要的作用。隨之而來(lái)的是管道種類(lèi)愈加多樣化,管材越來(lái)越豐富,管道所承受的荷載也越來(lái)越復(fù)雜。車(chē)行道下方的埋地管道受覆土荷載及路面交通荷載的作用,容易產(chǎn)生變形失穩(wěn)、破裂或滲漏等事故。一旦發(fā)生破壞事故,檢查和維修都比較困難,會(huì)給居民生活帶來(lái)較大影響并造成資源浪費(fèi)。本文以高密度聚乙烯管為研究對(duì)象,在總結(jié)埋地管道力學(xué)分析、交通荷載模擬、管道結(jié)構(gòu)計(jì)算和路基路面工程等課題研究現(xiàn)狀的基礎(chǔ)上,采用理論分析、算例對(duì)比驗(yàn)證、數(shù)值模擬等方法,分析管道土壓力、管道橫截面變形和管土相互作用理論,分別建立二維和三維模型,對(duì)土體自重作用、靜荷載作用和車(chē)輛荷載作用下埋地管道的力學(xué)性狀和變形特性進(jìn)行一系列研究。研究?jī)?nèi)容和主要結(jié)論有:(1)車(chē)行道下埋地管道系統(tǒng)包括管道、土體和交通荷載三大部分,圍繞這三個(gè)部分,探討現(xiàn)有埋地管道土壓力計(jì)算理論、管道截面徑向變形分析理論以及地面附加車(chē)輛荷載計(jì)算方法,結(jié)合算例將現(xiàn)有經(jīng)典計(jì)算理論與有限元分析進(jìn)行驗(yàn)證、對(duì)比,分析理論計(jì)算的不足之處及誤差情況。(2)建立二維有限元模型,研究埋地管道的橫截面力學(xué)性狀和變形特性,分析管道埋深、管徑、管土相對(duì)模量、荷載作用位置和大小等因素對(duì)管道受力特性和變形的影響。埋地管道豎向變形和最大Mises應(yīng)力與管頂豎向土壓力成正比,隨埋深增加覆土壓力增加,路面荷載附加壓力減小,理論上存在一個(gè)最佳埋深;埋深相同的情況下,小口徑管更容易發(fā)生破壞,剛性管比柔性管更容易破壞。(3)將道路結(jié)構(gòu)、埋地管道和路面交通荷載作為一個(gè)相互作用的有機(jī)整體,建立管道路基系統(tǒng)三維模型,分析三維模型管道在荷載作用下,管道截面變形和內(nèi)力分布規(guī)律,研究埋地管道在不同交通荷載作用下的力學(xué)性狀,討論了管道埋深、車(chē)輛荷載種類(lèi)、荷載作用位置和車(chē)速等因素對(duì)管道受力及變形的影響。埋地管線危險(xiǎn)點(diǎn)與管道兩端約束條件有關(guān);不同交通荷載作用下,管道力學(xué)響應(yīng)表現(xiàn)出不同特點(diǎn),車(chē)速和輪壓對(duì)管道力學(xué)響應(yīng)和變形均有影響。本文研究的方法和成果,可為實(shí)際工程埋地管道的設(shè)計(jì)與施工提供一定的理論依據(jù),為進(jìn)一步相關(guān)研究提供參考。
[Abstract]:With the rapid development of economy and the advancement of urbanization, buried pipelines have been widely used in the current society.As an effective means of material transportation, buried pipeline is widely used in the fields of municipal, water conservancy, transportation and energy, and plays an important role in modern industry, agriculture and people's life.Then the variety of pipeline is becoming more and more diversified, the pipe material is more and more abundant, and the load of pipeline is becoming more and more complex.The buried pipeline under the vehicular road is liable to deformation, instability, rupture or leakage due to the action of overlying earth load and road traffic load.Once damage accident occurs, inspection and maintenance are difficult, which will have a great impact on residents' lives and lead to waste of resources.In this paper, high-density polyethylene pipe is taken as the research object. On the basis of summarizing the current research situation of buried pipeline mechanics analysis, traffic load simulation, pipeline structure calculation and subgrade and pavement engineering, theoretical analysis is adopted, and numerical examples are compared and verified.Numerical simulation and other methods are used to analyze the theories of pipeline earth pressure, pipeline cross-section deformation and pipe-soil interaction, and to establish two-dimensional and three-dimensional models, respectively.The mechanical properties and deformation characteristics of buried pipeline under static load and vehicle load are studied.The research contents and main conclusions are as follows: (1) the buried pipeline system under the vehicular road includes three parts: pipeline, soil and traffic load. Around these three parts, the existing theory of calculating the earth pressure of buried pipeline is discussed.The radial deformation analysis theory of pipeline section and the calculation method of additional vehicle load on the ground are compared with the existing classical calculation theory and finite element analysis.(2) A two-dimensional finite element model is established to study the cross section mechanical properties and deformation characteristics of buried pipeline, and to analyze the buried depth, diameter and relative modulus of pipe soil.The influence of load position and size on the stress characteristics and deformation of pipeline.The vertical deformation and maximum Mises stress of buried pipeline are directly proportional to the vertical earth pressure at the top of the pipe. With the increase of buried depth, the additional pressure of pavement load decreases.The rigid pipe is easier to destroy than the flexible pipe. The road structure, buried pipeline and road surface traffic load are taken as an organic whole, and the three-dimensional model of pipeline subgrade system is established.This paper analyzes the distribution law of cross-section deformation and internal force of 3D model pipeline under load, studies the mechanical properties of buried pipeline under different traffic loads, discusses the buried depth of pipeline and the type of vehicle load.The influence of load position and speed on the stress and deformation of pipeline.The dangerous point of buried pipeline is related to the constraint conditions at both ends of pipeline, the mechanical response of pipeline shows different characteristics under different traffic loads, and the speed and wheel pressure have influence on the mechanical response and deformation of pipeline.The methods and results of this paper can provide some theoretical basis for the design and construction of buried pipeline in practical engineering and provide reference for further related research.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TU990.3

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