【摘要】：隨著自然災(zāi)害逐年頻發(fā),作為重要生命線方式的埋地管道安全性逐漸凸顯出來,管道作為運輸能量最為經(jīng)濟(jì)可靠的方法,其在城市建設(shè)中的重要性尤為重要。管道埋設(shè)在土體中,受到周圍土體介質(zhì)的約束,受力特性很大程度上受到限制。但是管線作為長度較長的線狀結(jié)構(gòu),穿越條件復(fù)雜,因此對城市埋地管道應(yīng)力和應(yīng)變以及破壞減輕的研究分析勢在必行。鑄鐵管道受力特性比較典型,國內(nèi)外研究人員已經(jīng)進(jìn)行了大量埋地管道縱向和橫向力學(xué)性質(zhì)的研究,本文在前人研究基礎(chǔ)上,使用有限元分析軟件ANSYS建立鑄鐵管道不同管徑的非線性土體摩擦模型,旨在建立更加合理的管道模擬形式,得到更加可靠的結(jié)果,分析管道不同荷載下變形特性和可靠性。具體來講,本文進(jìn)行的主要研究工作包括：(1)在不考慮地基不均勻沉降的情況下,給出管道分析模型關(guān)鍵參數(shù),建立縱向管土相互耦合模型,進(jìn)行管道內(nèi)力分析,并計算管道的橫向、縱向、環(huán)向應(yīng)力。(2)進(jìn)行管道受力變形和可靠性分析,提出管道受力情況下變形特征,以及失效判斷步驟,判斷管道結(jié)構(gòu)危險點,以及管道結(jié)構(gòu)可靠指標(biāo)和失效概率。(3)使用有限元分析軟件ANSYS建立管土接觸非線性有限元模型,定量分析不同管道參數(shù)下,管道應(yīng)力、應(yīng)變、以及位移變化,并分析參數(shù)對管道的影響大小,分析不同工況下,管道應(yīng)力的分布特征,判斷其失效狀態(tài)。(4)在計算和模擬基礎(chǔ)上,得到埋地管道應(yīng)力分布特性,并根據(jù)工程實際,提出合理的優(yōu)化設(shè)計和減荷措施,并分析其可行性。
[Abstract]:With the frequent occurrence of natural disasters year by year, the safety of buried pipeline, which is an important lifeline, is becoming more and more important. As the most economical and reliable method of transportation energy, pipeline plays an important role in urban construction. Pipe buried in the soil is constrained by the surrounding soil media, and the mechanical characteristics are limited to a great extent. However, as a long linear structure, the crossing condition of pipeline is complex, so it is imperative to study and analyze the stress, strain and damage mitigation of buried pipeline. The mechanical properties of cast iron pipeline are typical. Researchers at home and abroad have done a lot of research on longitudinal and transverse mechanical properties of buried pipeline. The nonlinear soil friction model of cast iron pipe with different diameter is established by using finite element analysis software ANSYS. The purpose of this paper is to establish a more reasonable pipe simulation form, obtain more reliable results, and analyze the deformation characteristics and reliability of the pipeline under different loads. Specifically, the main research work in this paper includes: (1) without considering the uneven settlement of the foundation, the key parameters of the pipeline analysis model are given, the longitudinal pipe-soil coupling model is established, and the internal force of the pipeline is analyzed. At the same time, the transverse, longitudinal and circumferential stresses of the pipeline are calculated. (2) the deformation and reliability analysis of the pipeline are carried out, and the deformation characteristics under the stress of the pipeline, as well as the failure judgment steps, are put forward to judge the dangerous point of the pipeline structure. And the reliability index and failure probability of pipeline structure. (3) the nonlinear finite element model of pipe and soil contact is established by using finite element analysis software ANSYS to quantitatively analyze the variation of stress, strain and displacement of pipeline under different pipeline parameters. The influence of parameters on pipeline is analyzed, the distribution characteristics of pipeline stress under different working conditions are analyzed, and the failure state is judged. (4) on the basis of calculation and simulation, the stress distribution characteristics of buried pipeline are obtained, and according to the engineering practice, the stress distribution characteristics of buried pipeline are obtained. Reasonable optimization design and load reduction measures are put forward, and its feasibility is analyzed.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU990.3;TU312.1

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