本文關(guān)鍵詞： 滑移速度 滑移距離 SPH深度積分法 摩擦流變模型 侵蝕效應(yīng)　出處：《大連理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：海底滑坡會(huì)對(duì)海洋工程結(jié)構(gòu)物造成嚴(yán)重破壞。海底滑坡一般表現(xiàn)為高流速、長(zhǎng)距離的滑動(dòng),即使在深海陸坡很平坦的區(qū)域也有可能發(fā)生滑坡,滑移體會(huì)對(duì)流徑上的海底管線等設(shè)施產(chǎn)生強(qiáng)烈的沖擊,直接危害海洋工程設(shè)施的安全,造成巨大的經(jīng)濟(jì)損失。本文主要研究海底滑坡的流動(dòng)過程,模擬了在不同水深、坡度、接觸摩擦系數(shù)、侵蝕率工況下的海底滑坡,對(duì)比了各個(gè)工況的滑移速度、滑移長(zhǎng)度以及沉積物厚度時(shí)程曲線,并整理了最大滑移距離、最大速度等信息,討論變化規(guī)律。研究成果可為海底滑坡災(zāi)害預(yù)警和海底管線路由選址提供技術(shù)參考。首先,本文系統(tǒng)地總結(jié)了海底滑坡的類型、誘發(fā)機(jī)制、海底滑坡的特征、海底滑坡和SPH深度積分法的研究概況。其次,詳細(xì)介紹了SPH深度積分方法的基本理論、摩擦流變模型和侵蝕模型。海底滑坡需要考慮流動(dòng)過程中滑移體與水體的相互作用,滑坡發(fā)生前滑移體的自由面受到的靜水壓力的作用及滑動(dòng)后受到的動(dòng)水壓力的作用；接觸摩擦系數(shù)隨著滑移體固結(jié)和動(dòng)水壓力的改變而改變；被侵蝕、挾帶的土體的慣性阻力會(huì)增加滑移體底部的剪切阻力。再次,采用SPH深度積分法和Bing程序模擬了海底滑坡,分析了計(jì)算結(jié)果。SPH深度積分法模擬了三維海底滑坡,并三維陸地滑坡進(jìn)行了相比,直觀展示了沉積物的滑移過程。最后,總結(jié)了數(shù)值模擬結(jié)果,探討規(guī)律：水深對(duì)海底滑坡的最大滑移距離和速度的影響并不明顯,但坡度、接觸摩擦系數(shù)的變化影響明顯；當(dāng)侵蝕率達(dá)到10-4m-1以上時(shí),侵蝕效應(yīng)明顯。SPH深度積分模型,計(jì)算簡(jiǎn)便,適于模擬海底滑坡。
[Abstract]:Submarine landslides can cause serious damage to offshore structures. Submarine landslides are usually characterized by high velocities, long distance slippages, and landslides can occur even in areas where deep sea slopes are flat. The slip experiences that the submarine pipeline and other facilities on the convection path have a strong impact, directly endanger the safety of the marine engineering facilities and cause huge economic losses. This paper mainly studies the flow process of the submarine landslide, and simulates the flow process of the submarine landslide at different water depths and slopes. Under the condition of contact friction coefficient and erosion rate, the slip velocity, slip length and sediment thickness time history curve of each condition are compared, and the information of maximum slip distance and maximum velocity are sorted out. The research results can provide a technical reference for submarine landslide disaster warning and submarine pipeline routing location. Firstly, this paper systematically summarizes the types of submarine landslide, inducing mechanism, characteristics of submarine landslide, The basic theory of SPH depth integration method, friction rheological model and erosion model are introduced in detail. The effect of hydrostatic pressure on the free surface of the sliding body before the landslide occurs and the effect of the hydrostatic pressure on the sliding body; the contact friction coefficient changes with the change of the slip body consolidation and the dynamic water pressure; it is eroded, The inertia resistance of the entrapped soil will increase the shear resistance at the bottom of the slip body. Thirdly, the submarine landslide is simulated by SPH depth integration method and Bing program, and the three-dimensional submarine landslide is simulated by the SPH-depth integration method. Finally, the numerical simulation results are summarized, and the law is discussed: the influence of water depth on the maximum slip distance and velocity of submarine landslide is not obvious, but the slope is not obvious. The influence of contact friction coefficient is obvious, when the erosion rate is above 10-4m-1, the erosion effect is obvious. SPH depth integral model is easy to calculate and is suitable for simulating submarine landslide.
【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】：2015
【分類號(hào)】：P642.22;P736

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 胡光海,劉忠臣,孫永福,張效龍;海底斜坡土體失穩(wěn)的研究進(jìn)展[J];海岸工程;2004年01期

相關(guān)碩士學(xué)位論文 前1條

1 朱林;南海北部荔灣3-1氣田管道路由區(qū)災(zāi)害地質(zhì)特征研究[D];國(guó)家海洋局第一海洋研究所;2013年

，

本文編號(hào)：1489220