本文選題：預(yù)應(yīng)力鋼筒混凝土管(PCCP) + ABAQUS仿真��； 參考：《南京航空航天大學(xué)》2014年碩士論文

【摘要】：隨著國(guó)民經(jīng)濟(jì)的發(fā)展,缺水已成為制約我國(guó)各地發(fā)展的主要因素,由于我國(guó)水資源分布的不均勻性,長(zhǎng)距離輸水工程越來(lái)越多。PCCP作為一種大口徑、高工壓、長(zhǎng)壽命的管道,在長(zhǎng)距離引水工程、高壓給水工程、城市給水管網(wǎng)改造以及電廠的補(bǔ)充水、循環(huán)水和水力輸送系統(tǒng)等方面得到廣泛應(yīng)用,PCCP的應(yīng)用大多為國(guó)家基礎(chǔ)建設(shè)重大工程,關(guān)乎國(guó)計(jì)民生,其結(jié)構(gòu)的安全性和運(yùn)行的穩(wěn)定性是值得重點(diǎn)關(guān)注的技術(shù)問(wèn)題。本文結(jié)合南京水利科學(xué)研究院項(xiàng)目《在役超大PCCP管道結(jié)構(gòu)安全評(píng)估技術(shù)研究》和南水北調(diào)中線PCCP建設(shè)項(xiàng)目,利用有限元軟件ABAQUS,對(duì)超大口徑PCCP管道的實(shí)際施工及運(yùn)行階段的安全性、穩(wěn)定性進(jìn)行了研究探討。本文的主要工作如下:運(yùn)用ABAQUS建立了預(yù)應(yīng)力鋼筒混凝土管與地基基礎(chǔ)相互作用的有限元計(jì)算模型,對(duì)管體進(jìn)行了有限元仿真分析,根據(jù)計(jì)算結(jié)果給出了管體的應(yīng)力分布規(guī)律。通過(guò)在模型中施加不同的內(nèi)水壓力,分析管體在不同水壓工況下的應(yīng)力變化。得到結(jié)論:在內(nèi)壓0.6MPa下,PCCP各部件應(yīng)力均小于其設(shè)計(jì)強(qiáng)度,滿(mǎn)足PCCP的正常使用要求;在內(nèi)水壓從0.4MPa加載到1.4MPa過(guò)程中,預(yù)應(yīng)力鋼絲中應(yīng)力增長(zhǎng)均勻,鋼筒中應(yīng)力增長(zhǎng)先快后慢,混凝土中拉應(yīng)力增長(zhǎng)先慢后快。加載到極限內(nèi)壓1.4MPa時(shí),鋼絲和鋼筒中的應(yīng)力小于材料的設(shè)計(jì)強(qiáng)度,且仍有較大富余,而在1.4MPa內(nèi)水壓力下管芯混凝土中最大拉應(yīng)力超出其抗拉強(qiáng)度,拉應(yīng)力最大處已開(kāi)裂。運(yùn)用ABAQUS模擬PCCP回填土施工過(guò)程,研究分析施工回填土過(guò)程中PCCP各部件應(yīng)力分布規(guī)律及管道各部件的應(yīng)力變化情況。得到結(jié)論:在回填土壓作用下管道產(chǎn)生水平方向延伸垂直方向收縮的橢圓形變形;回填土過(guò)程中,位于管芯內(nèi)側(cè)的混凝土,管底、管頂受拉,管腰受壓。位于管芯外側(cè)的混凝土,管底、管頂受壓,管腰受拉,管頂、管底位置的預(yù)應(yīng)力鋼絲中應(yīng)力值減小,管腰位置的預(yù)應(yīng)力鋼絲中應(yīng)力值增大,但其變化值很小。
[Abstract]:With the development of national economy, water shortage has become the main factor restricting the development of our country. Because of the uneven distribution of water resources in our country, more and more long-distance water conveyance projects are used as a large-caliber, high-pressure, long-life pipeline. The application of PCCP in long distance water diversion project, high pressure water supply project, urban water supply network reconstruction and power plant water supply, circulating water and hydraulic conveying system is widely used. Most of the application of PCCP is a major national infrastructure project, which is related to the national economy and people's livelihood. The safety of its structure and the stability of its operation are important technical problems. This paper combines the project of Nanjing Research Institute of Water Conservancy, "Research on structural Safety Assessment of Super-large PCCP Pipeline in Service" and PCCP Construction Project of Middle Route of South-to-North Water transfer Project, By using finite element software Abaqus, the safety and stability of the super-large diameter PCCP pipeline during construction and operation are studied and discussed. The main work of this paper is as follows: the finite element calculation model of interaction between prestressed steel cylinder concrete pipe and foundation is established by Abaqus, the finite element simulation analysis of pipe body is carried out, and the stress distribution law of pipe body is given according to the calculation results. By applying different internal water pressure to the model, the stress changes of the tube under different water pressure conditions are analyzed. It is concluded that the stress of each component of PCCP is less than its design strength under internal pressure of 0.6 MPA, which meets the requirements of normal use of PCCP, and the stress in prestressed steel wire increases uniformly during the loading of internal water pressure from 0.4 MPA to 1.4 MPA, and the stress growth in steel cylinder is first fast and then slow. The tensile stress in concrete grows slowly first and then quickly. When the ultimate internal pressure is 1.4 MPA, the stress in steel wire and steel cylinder is smaller than the design strength of the material, and there is still a large surplus. However, the maximum tensile stress in the pipe core concrete under 1.4 MPA water pressure exceeds its tensile strength, and the maximum tensile stress has been cracked. Abaqus is used to simulate the construction process of PCCP backfill soil. The stress distribution law of PCCP components and the stress variation of pipeline components during the construction backfill process are studied and analyzed. The conclusions are as follows: under the action of backfill earth pressure the pipe produces elliptical deformation of horizontal extension and vertical contraction and in the process of backfill concrete located in the inner side of the pipe core the bottom of the pipe the top of the pipe is pulled and the pipe waist is compressed. On the outside of the pipe core, the stress value in the prestressed steel wire at the outer side of the pipe core, the pressure on the bottom of the pipe, the tension on the waist of the pipe, the position of the top of the pipe and the bottom of the pipe decreases, but the stress value in the prestressed steel wire at the position of the pipe waist increases, but the change value is very small.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU991.36;TV672.2
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本文編號(hào)：2062826