本文關(guān)鍵詞： X80 埋地管道 落石沖擊 可靠性 極限狀態(tài)　出處：《西南石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著天然氣管道的大量敷設(shè),第三方載荷(落石沖擊、夯擊、交通載荷)對埋地管道的干擾日益嚴(yán)重,尤其崩塌引起的落石災(zāi)害。落石具有較大的沖擊能量,沖擊產(chǎn)生的損壞極易超過管道的極限承載能力,大口徑高鋼級管道多屬于薄殼結(jié)構(gòu),損壞更為嚴(yán)重。但是,目前缺少大口徑高鋼級管道在落石沖擊力作用下極限狀態(tài)設(shè)計方法的研究。本文結(jié)合沖擊理論、有限元數(shù)值模擬和概率分析方法等手段,對落石從邊坡運(yùn)動開始到?jīng)_擊管道結(jié)束整個過程進(jìn)行了研究,確定了不同壁厚的X80鋼級埋地管道在落石沖擊力作用下的應(yīng)力分布規(guī)律與設(shè)計方法,主要取得如下成果:(1)對落石邊坡運(yùn)動過程和落石沖擊過程進(jìn)行理論分析,確定邊坡高度、坡度和落石重量是影響落石沖擊力大小的主要因素,并針對主要影響因素建立了用于描述落石沖擊力分布規(guī)律的100個邊坡模型�；趹�(yīng)力的失效判據(jù)進(jìn)行管道極限狀態(tài)設(shè)計方法研究,確定管道極限狀態(tài)為極端極限狀態(tài)(ULS)。(2)基于RocFall軟件建立的落石運(yùn)動邊坡模型,得到落石邊坡運(yùn)動結(jié)束后首次沖擊地面過程中沖擊速度、沖擊角度和沖擊位置等變量的正態(tài)分布規(guī)律�；诟倪M(jìn)的葉四橋經(jīng)驗公式計算落石沖擊力,并利用SPSS軟件檢驗得到落石沖擊力服從Gamma分布,形狀參數(shù)α為5.050,速率參數(shù)β為0.002。對影響落石沖擊力計算的主要因素進(jìn)行敏感性分析,得到影響因素敏感程度從大到小順序為落石高度邊坡坡度落石重量。(3)基于ABAQUS有限元軟件建立的落石沖擊埋地管道模型進(jìn)行不同沖擊方案的模擬與分析,沖擊力作用下管道最大應(yīng)力出現(xiàn)在管道頂端。利用SPSS統(tǒng)計軟件對Φ1219×18.4mn、Φ1219×22mm和Φ1219×26.4mm三種規(guī)格在不同埋深情況下管道頂端最大應(yīng)力進(jìn)行統(tǒng)計分析,管道頂端最大應(yīng)力均服從Gamma分布。通過Matlab編程對管道應(yīng)力分布擬合,總共確定了 12組Gamma分布概率密度函數(shù)參數(shù)。(4)通過Matlab編程,采用直接抽樣Monte Carlo方法計算管道失效概率和可靠指標(biāo)。對Φ1219×18.4mm、Φ1219×22mm 和Φ1219×26.4mn 三種規(guī)格 X80 鋼級管道的臨界埋深進(jìn)行研究,管道臨界埋深分別為1.33m、1.26m、1.15m。在目標(biāo)安全水平下管道應(yīng)力極限均沒有超過API SPEC 5L《管線管規(guī)范》規(guī)定的最小強(qiáng)度值�；跇O限狀態(tài)方程Z = 0.9σs-σvon mises進(jìn)行管道極限狀態(tài)設(shè)計,給出了崩塌區(qū)X80級埋地管道在不同目標(biāo)安全水平下的極限狀態(tài)設(shè)計表達(dá)式,提出了 X80級埋地管道極限狀態(tài)設(shè)計方法,并編制了相應(yīng)的極限狀態(tài)設(shè)計流程�；诟怕史治龇椒ù_定的管道極限狀態(tài)設(shè)計方法與設(shè)計參數(shù)不僅提高了埋地輸氣管道可靠性分析的可信度,而且對X80鋼級埋地管道在崩塌區(qū)的風(fēng)險評估、管道設(shè)計及施工具有重要意義。
[Abstract]:With the large number of natural gas pipeline laying, the third party load (falling stone impact, tamping, traffic load) to the buried pipeline increasingly serious interference, especially the collapse caused by the rock fall disaster, falling stone has a large impact energy. The damage caused by impact is easy to exceed the ultimate bearing capacity of pipeline. The large diameter and high steel grade pipeline belongs to thin shell structure, and the damage is more serious. At present, there is a lack of research on the design method of limit state of large-caliber and high-steel pipeline under the action of rock drop impact. This paper combines impact theory, finite element numerical simulation and probabilistic analysis method and so on. The whole process from the start of slope movement to the end of impingement pipeline is studied, and the stress distribution and design method of X80 steel buried pipeline with different wall thickness under the action of falling rock impact force are determined. The main achievements are as follows: 1) the movement process and impact process of rock fall slope are analyzed theoretically, and the slope height, slope degree and falling stone weight are the main factors that affect the impact force. According to the main influencing factors, 100 slope models are established to describe the distribution law of rock fall impact force. The limit state design method of pipeline is studied based on the failure criterion of stress. Determining the limit state of pipeline as extreme limit state A slope model based on RocFall software is established. The normal distribution law of the impact velocity, impact angle and impact position during the first impact on the ground after the end of the rock fall slope movement is obtained. The impact force is calculated based on the improved Ye Si Bridge empirical formula. The distribution of impact force clothing from Gamma was obtained by SPSS software, and the shape parameter 偽 was 5.050. The rate parameter 尾 is 0.002.The sensitivity analysis of the main factors affecting the calculation of the impact force of rock drop is carried out. The order of sensitivity of influencing factors from big to small is slope drop weight of rock fall height slope. Simulation and analysis of different impact schemes are carried out based on the model of rockfall impingement buried pipeline established by ABAQUS finite element software. The maximum stress appears at the top of the pipe under the action of impact force. 桅 1219 脳 18.4mn is calculated by SPSS software. The maximum stress at the top of the pipe with 桅 1219 脳 22mm and 桅 1219 脳 26.4mm under different buried depths is analyzed statistically. The maximum stress at the top of the pipe is distributed from Gamma. The stress distribution of the pipeline is fitted by Matlab programming. A total of 12 groups of Gamma distribution probability density function parameters. The failure probability and reliability index of pipeline are calculated by direct sampling Monte Carlo method. The critical burying depth of 桅 1219 脳 22mm and 桅 1219 脳 26.4mn X80 steel grade pipeline is studied. 1.15m. at the target safety level, the stress limit of the pipeline does not exceed the minimum strength specified in API SPEC 5L < Pipe Specification >. Based on the limit state equation Z =. 0. 9 蟽 s-蟽 von mises is used to design the limit state of pipeline. The limit state design expression of X80 buried pipeline in collapse area under different target safety level is given, and the limit state design method of X80 buried pipeline is put forward. The design method and design parameters of pipeline limit state based on probabilistic analysis method not only improve the reliability analysis of buried gas pipeline. Moreover, it is of great significance for risk assessment, pipeline design and construction of X80 steel-grade buried pipeline in collapse area.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE973.1

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