【摘要】：海底柔性管道的鋪設(shè)是管道正式投入使用過程中最為關(guān)鍵的一個(gè)步驟,對(duì)于整個(gè)海底建設(shè)工程而言至關(guān)重要。水平式鋪設(shè)方法因具有結(jié)構(gòu)形式簡(jiǎn)單、耗資小以及鋪設(shè)效率高等優(yōu)點(diǎn)而得到廣泛應(yīng)用。水平式鋪設(shè)過程中,上彎段管道部分是整個(gè)鋪設(shè)線型中最危險(xiǎn)的區(qū)域,其最容易發(fā)生的失效模式為徑向擠壓失效。 本文應(yīng)用自然懸鏈線理論,針對(duì)水平式鋪設(shè)過程的整體線型,得到了上彎段管道的張力、曲率以及徑向擠壓力的理論表達(dá)式。之后,應(yīng)用專業(yè)的海洋管道設(shè)計(jì)分析軟件Orcaflex對(duì)水平式鋪設(shè)過程進(jìn)行了數(shù)值仿真,主要的研究?jī)?nèi)容及成果為： (1)不同鋪設(shè)水深下,上彎段管道承受的徑向擠壓力的整體分布形式是一致的,這種分布形式幾乎不受波浪方向和波浪高度的影響；并且隨著水深的增加,徑向擠壓力呈現(xiàn)出比較明顯的增加趨勢(shì)。 (2)在鋪設(shè)水深和波浪高度一定的情況下,波浪方向?qū)ι蠌澏喂艿缽较驍D壓力的分布影響較小,且在波浪方向?yàn)?5°時(shí),上彎段管道的徑向擠壓力最大。 (3)在波浪高度為2.0米到2.5米左右的鋪設(shè)工況下,上彎段管道的徑向擠壓力變化幅度較�。划�(dāng)波浪高度達(dá)到3.0米時(shí),徑向擠壓力發(fā)生了比較明顯的增加。 實(shí)際中,管道鋪設(shè)作業(yè)涉及到龐大的鋪設(shè)系統(tǒng),面臨的海洋環(huán)境也十分復(fù)雜,因此整個(gè)系統(tǒng)的運(yùn)動(dòng)和受力都具有很強(qiáng)的非線性、耦合性和隨機(jī)性,理論和數(shù)值分析方法很難對(duì)其進(jìn)行完整準(zhǔn)確的分析。本文進(jìn)一步利用半物理仿真實(shí)驗(yàn)原理,開展了模擬鋪設(shè)工況的實(shí)驗(yàn)。通過實(shí)驗(yàn),得到的主要結(jié)論為： (1)在不同的海洋環(huán)境參數(shù)下,通過對(duì)上彎段管道部分中一點(diǎn)的徑向擠壓力的分析可知,實(shí)驗(yàn)測(cè)量結(jié)果與數(shù)值仿真結(jié)果具有較好的對(duì)應(yīng)性,兩者隨著鋪設(shè)水深、波浪方向以及波浪高度的不同而表現(xiàn)出比較一致的變化趨勢(shì)。 (2)在一定的海洋環(huán)境參數(shù)下,通過對(duì)上彎段管道部分同一點(diǎn)的徑向擠壓力的對(duì)比可知,數(shù)值解最大,理論解最小,而實(shí)驗(yàn)值介于理論解和數(shù)值解之間。
[Abstract]:The laying of submarine flexible pipeline is one of the most important steps in the process of the pipeline being put into use, and it is very important for the whole submarine construction project. Horizontal laying method is widely used because of its simple structure, low cost and high laying efficiency. In the horizontal laying process, the upper bend section of pipeline is the most dangerous area in the whole laying line, and the most prone failure mode is radial extrusion failure. Based on the natural catenary theory, the theoretical expressions of the tension, curvature and radial extrusion force of the upward bend pipe are obtained for the integral alignment of the horizontal laying process. After that, the horizontal laying process is simulated with the professional offshore pipeline design and analysis software Orcaflex. The main research contents and results are as follows: (1) under different laying depth, The overall distribution of the radial extrusion force on the upper bend pipe is consistent, and the distribution is almost independent of the direction and height of the wave. With the increase of water depth, the radial extrusion pressure increases obviously. (2) under the condition of constant water depth and wave height, the influence of the wave direction on the radial extrusion force distribution of the upward bend pipe is relatively small, and the radial extrusion force of the upper bend pipe is the largest when the wave direction is 45 擄. (3) when the wave height is about 2.0 m to 2.5 m, the radial extrusion pressure of the upper bend pipe is smaller, and when the wave height reaches 3.0 m, the radial extrusion pressure increases obviously. In practice, pipeline laying involves a huge laying system, and the marine environment is also very complex. Therefore, the motion and force of the whole system are very nonlinear, coupled and random. Theoretical and numerical analysis methods are difficult to complete and accurate analysis. In this paper, the semi-physical simulation experiment principle is used to simulate the laying condition. Through experiments, the main conclusions are as follows: (1) under different marine environmental parameters, the radial extrusion pressure at one point in the upper bend pipeline is analyzed. The experimental results have a good correspondence with the numerical simulation results, and they show a relatively consistent trend with the different water depth, wave direction and wave height. (2) under certain marine environmental parameters, the numerical solution is the largest and the theoretical solution is the smallest, and the experimental value is between the theoretical solution and the numerical solution by comparing the radial extrusion pressure at the same point in the upper curved section pipeline.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P756.2

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本文編號(hào)：2422016