本文選題：圍海造陸 + 吹填��； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：近年來(lái)，隨著經(jīng)濟(jì)建設(shè)的發(fā)展，城市綜合用地需求急劇上升，圍海造陸工程提出了向海洋要地的思路。利用船舶絞吸海里的泥沙吹填至海堤與陸地圍成的區(qū)域，再通過(guò)地基處理的方法，，是目前傳統(tǒng)的做法。然而前期的海堤工程在整個(gè)建設(shè)中起著至關(guān)重要的作用。由于新建海堤位于外海，在吹填成陸之前，海堤結(jié)構(gòu)及地基面臨著風(fēng)浪、沖刷等外力的破壞，容易發(fā)生滑動(dòng)破壞。因此在建設(shè)之前，海堤工程的安全穩(wěn)定性是工程風(fēng)險(xiǎn)關(guān)鍵控制指標(biāo)之一，也是設(shè)計(jì)人員重點(diǎn)關(guān)心的問(wèn)題。 本文結(jié)合某海堤工程具體實(shí)例，采用理論計(jì)算法和數(shù)值模擬法，對(duì)堤心充填管帶外側(cè)拋石式海堤結(jié)構(gòu)整體抗滑穩(wěn)定性進(jìn)行計(jì)算分析，認(rèn)為海堤工程管帶老化導(dǎo)致充砂管帶粘聚力下降對(duì)海堤工程整體抗滑穩(wěn)定性有一定影響，主要體現(xiàn)在隨著管帶的老化，海堤工程的應(yīng)力和位移均有不同程度的增大，其中水平位移變化最大；充砂管帶粘聚力的下降導(dǎo)致海堤工程外側(cè)護(hù)坡出現(xiàn)塑性變形區(qū)，說(shuō)明管帶的老化會(huì)導(dǎo)致外側(cè)護(hù)坡滑坡進(jìn)而引起海堤工程整體失穩(wěn)。 數(shù)值計(jì)算結(jié)果表明，沖淤基本平衡后海堤口門(mén)附近沖刷深度最大，兩堤頭的沖刷深度次之，且沖刷坑會(huì)延伸至堤跟附近，對(duì)海堤堤頭的穩(wěn)定性存在風(fēng)險(xiǎn)。在當(dāng)前風(fēng)浪條件下，當(dāng)龍口灘面沖刷深度達(dá)15.5m時(shí)，海堤工程龍口堤頭保護(hù)斷面大塊石護(hù)腳豎向位移較大，沖刷坡腳出現(xiàn)隆起，坡面出現(xiàn)明顯的水平滑移，地基土層出現(xiàn)明顯的滑動(dòng)面，海堤工程堤頭的整體存在失穩(wěn)風(fēng)險(xiǎn)。 文中針對(duì)海堤充填管帶的老化和水下地形局部沖刷對(duì)海堤的整體抗滑穩(wěn)定性進(jìn)行了分析，指出在工程施工過(guò)程中的薄弱環(huán)節(jié)。其計(jì)算分析方法可對(duì)相似吹填造陸工程中的海堤抗滑穩(wěn)定性研究提供參考和借鑒作用。
[Abstract]:In recent years, with the development of economic construction, the demand for urban comprehensive land has risen sharply. It is the traditional method to use the ship to carry the sediment from the sea to the area surrounded by the seawall and the land and then through the foundation treatment. However, the early seawall project plays an important role in the whole construction. Because the newly built seawall is located outside the sea, the structure and foundation of the seawall are subject to the damage of wind, wave, erosion and other external forces before it is filled into land. Therefore, before construction, the safety and stability of seawall project is one of the key control indexes of engineering risk, and it is also the key concern of designers. In this paper, a concrete example of a seawall project is used to calculate and analyze the overall anti-skid stability of the structure of riprap type seawall with the core filling pipe outside of the dike by using the theoretical calculation method and the numerical simulation method. It is considered that the decrease of the cohesive force of the sand filled pipe band caused by the aging of the pipe belt of the seawall works has a certain effect on the overall stability of the seawall project, which is mainly reflected in the increase of the stress and displacement of the seawall engineering in varying degrees with the aging of the pipe belt. The change of horizontal displacement is the biggest, and the decrease of cohesion of sand filled pipe zone leads to plastic deformation zone on the outside slope of seawall project, which indicates that the aging of pipe belt will lead to the landslide of lateral slope protection and then cause the overall instability of seawall project. The numerical results show that the depth of erosion near the entrance of the seawall is the largest after the basic balance of erosion and siltation, and the erosion depth of the two dikes is the second, and the scour pit will extend to the vicinity of the seawall, which is a risk to the stability of the head of the seawall. Under the current wind and wave conditions, when the erosion depth of Longkou beach reaches 15.5m, the vertical displacement of large block stone protecting foot of Longkou embankment head protection section, the uplift of scour slope foot and the obvious horizontal slip of slope surface appear. There is obvious sliding surface in the foundation soil, and the whole head of the seawall project is at risk of instability. In this paper, the overall anti-slide stability of seawall is analyzed according to the aging of seawall filled pipe belt and local erosion of underwater topography, and the weak links in the construction process are pointed out. The calculation and analysis method can be used as a reference for the study of anti-slide stability of seawall in similar reclamation engineering.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U656.314

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本文編號(hào)：1967345