本文選題：埋地管道 + 懸空長度�。� 參考：《西安石油大學(xué)》2015年碩士論文

【摘要】：長輸管道沿線地質(zhì)地貌錯(cuò)綜復(fù)雜,自然條件惡劣,容易受外界載荷(如地質(zhì)滑坡、坍塌、疏松土體沉降、濕陷性黃土、地震、水毀等)影響導(dǎo)致大跨度懸空,給管道的安全運(yùn)行帶來嚴(yán)重隱患。因此,對(duì)懸空管道的研究十分有必要。本文首先利于土體的基本性質(zhì)和本構(gòu)方程,分析了埋地管道意外懸空時(shí),可能存在的載荷情況;基于Winkler假設(shè)的彈性地基梁理論建立了管道兩端埋地段管土作用的懸空管道模型,分析了懸空管道跨中截面和管道內(nèi)出土端的彎矩和撓度。其次,在應(yīng)力失效準(zhǔn)則范圍內(nèi),基于Mises屈服理論確定出管道懸空長度判斷依據(jù)。最后,利用土體的摩爾庫倫模型和管線鋼材料的Ramberg-Osgood本構(gòu)方程,采用有限元軟件ABAQUS建立了懸空管道的結(jié)構(gòu)靜力學(xué)分析有限元計(jì)算模型。計(jì)算分析得出如下結(jié)論:(1)懸空管道上最大應(yīng)力、最大應(yīng)變出現(xiàn)在懸空管道的內(nèi)出土端的上表面,最大位移出現(xiàn)在懸空管道跨中截面,而此處應(yīng)力較小;最大應(yīng)力、最大應(yīng)變和最大位移都隨著懸空長度的增加而變大;當(dāng)懸空管道處于彈性階段時(shí),管道上最大應(yīng)力對(duì)懸空長度的變化敏感;當(dāng)懸空管道出現(xiàn)局部屈服時(shí),最大應(yīng)變對(duì)懸空長度的增加比較敏感;(2)在懸空管道的內(nèi)出端截面上,管道上的Mises等效應(yīng)力,從上輪廓線到下輪廓線先減小后增大,在上輪廓線處最大。在懸空管道的跨中截面上,管道上的Mises等效應(yīng)力,從上輪廓線到下輪廓線也是先減小后增大,在下輪廓線處最大;(3)對(duì)于管道材料為X60、規(guī)格為Φ508×7.4mm、土體介質(zhì)為粘土、內(nèi)壓為4.3MPa、埋深為2m的輸氣管道,當(dāng)懸空長度為93m,最大Mises應(yīng)力達(dá)到管道材料的許用應(yīng)力。當(dāng)懸空懸空長度為180m;最大Mises應(yīng)力達(dá)到管道材料的屈服強(qiáng)度。同等條件下,埋地輸油管道懸空長度為50m,達(dá)到許用應(yīng)力;懸空長度為73m,達(dá)到屈服強(qiáng)度;(4)對(duì)于以管道內(nèi)壓為單變量的輸氣懸空管道,隨著內(nèi)壓增加,懸空長度降低;對(duì)于以管道壁厚為單變量的輸氣懸空管道,壁厚增加懸空長度增加;通過本文得到的結(jié)果對(duì)評(píng)價(jià)實(shí)際的懸空管道有著指導(dǎo)作用,并為管道的維修作業(yè)提供直接的理論數(shù)據(jù)支持。
[Abstract]:The geological and geomorphology along the long distance pipeline is complicated, and the natural conditions are bad, which are easy to be affected by the external loads (such as geological landslide, collapse, loose soil subsidence, collapsible loess, earthquake, water destruction, etc.), resulting in the suspension of large span. It brings serious hidden trouble to the safe operation of pipeline. Therefore, it is necessary to study the suspended pipeline. In this paper, the basic properties of soil and constitutive equation are analyzed firstly, and the potential loads of buried pipeline are analyzed, based on Winkler's assumption of elastic foundation beam theory, the suspended pipe model of pipe and soil action at both ends of pipeline is established. The bending moment and deflection of the suspended pipe span and the unearthed end of the pipe are analyzed. Secondly, in the range of stress failure criterion, based on Mises yield theory, the judgment basis of pipeline suspension length is obtained. Finally, the finite element model for structural statics analysis of suspended pipeline is established by using the Moore Coulomb model of soil and the Ramberg-Osgood constitutive equation of pipeline steel material, using the finite element software Abaqus. The results of calculation and analysis are as follows: (1) the maximum stress and strain appear on the upper surface of the inner unearthed end of the suspended pipe, and the maximum displacement occurs in the middle section of the span of the suspended pipe, where the stress is small; the maximum stress, The maximum strain and displacement increase with the increase of the suspended length, the maximum stress is sensitive to the variation of the suspended length when the suspended pipeline is in the elastic stage, and the local yield of the suspended pipeline is observed. The maximum strain is sensitive to the increase of the suspended length. (2) the Mises equivalent stress on the inner and outer end of the suspended pipe decreases first from the upper contour to the lower contour and then increases, and the maximum is at the upper contour. The Mises equivalent stress on the span of the suspended pipeline decreases first and then increases from the upper contour to the lower contour, and the maximum is at the bottom contour. (3) for the pipeline material X60, the specification is 桅 508 脳 7.4 mm, the soil medium is clay. When the suspended length is 93 m, the maximum Mises stress is equal to the allowable stress of pipeline material when the internal pressure is 4.3 MPA and the buried depth is 2 m. When the suspension length is 180 m, the maximum Mises stress reaches the yield strength of the pipe material. Under the same conditions, the suspended length of buried oil pipeline is 50m, the allowable stress is achieved, the suspended length is 73m, and the yield strength is achieved. (4) for the gas pipeline with internal pressure as a single variable, the suspended length decreases with the increase of internal pressure. For the pipeline with single variable wall thickness, the length of the suspended pipe increases with the increase of the wall thickness, and the results obtained in this paper have a guiding role in evaluating the actual suspended pipeline and provide direct theoretical data support for the maintenance of the pipeline.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE973

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