本文選題：填海造陸 + 滲流破壞　； 參考：《天津大學》2014年碩士論文

【摘要】：現代建筑結構基礎的破壞通常有以下兩種形式,其一是建筑結構基礎受到上部結構長期持續(xù)載荷作用發(fā)生沉降或者產生過大的沉降差,從而致使上部結構嚴重沉陷和傾斜從而喪失使用價值;其二是由于結構基礎受到遠大于其所能承載的極限而發(fā)生破壞。由于結構基礎破壞形式的復雜性,如何精確的進行破壞過程的數值模擬以及選取最合適的處理措施是一個需要不斷完善的過程。本文在某填海造陸人工島工程的施工過程中分別考慮了可能存在的不同種類結構基礎破壞的形式,主要研究以下三個內容：(1)滲透破壞問題是水利工程地基需要著重考慮的問題。本文選取某填海造陸人工島工程(內設內河景觀工程)的防滲問題進行有限元分析研究。沒有采取防滲措施時,該工程在內河與外海地理位置相近的地方出現遠大于允許的滲透坡降值,極可能發(fā)生滲透破壞,甚至殃及島上的建筑物。由于滲透損失,內河水位下降的十分迅速,導致內河水位不足以滿足觀光船只的航行。本文選取最不利工況下滲透坡降大于允許最大坡降位置作為主要防滲體布置位置,然后進行設計論證分析。結果表明,優(yōu)化防滲措施后,有效的較低了滲透坡降值,并且使內河水位可以維持正常航行的時間得到加長,達到能夠安全、穩(wěn)定運行的目的。(2)人工島內軟土地基,島上建筑物多采用灌注樁做基礎。由于灌注樁側泥皮的存在,灌注樁與土相接觸的模式變?yōu)闃�、泥皮和土接觸的模式,由于泥皮的軟化作用,降低了單樁承載力,從而形成泥皮缺陷樁。本文利用有限元法分析了泥皮對灌注樁承載力的影響,并且證明基于后注漿施工工藝對改善泥皮樁承載性狀的可行性和有效性。(3)島上高層建筑物在經處理的軟土地基上,基礎沉降變形直接關系到上部結構的安全。因此施工過程中要在第一層布置多個沉降觀測點,隨著樓層的不斷加高,實時監(jiān)測�；A沉降是一個復雜的非線性、動態(tài)幾何變形過程,各沉降觀測點間必有很強的相關性�；诶畲鷶档姆椒◤睦钊旱慕嵌扔行У慕鉀Q了各沉降監(jiān)測點間的相關性問題。本文以島上一高層建筑物為例,用李群算法同時對多個監(jiān)測點的沉降進行動態(tài)分析和整體性預測,證明了基于李代數的群測點預測算法在預測建筑結構基礎沉降方面的可行性和高效性。
[Abstract]:There are usually two kinds of damage to the foundation of modern building. One is that the foundation of the building is subjected to the long-term continuous load of the superstructure, which results in settlement or excessive settlement difference. Therefore, the superstructure is seriously sunk and inclined, thus losing its use value, and the second is that the foundation of the structure is destroyed because it is far greater than the limit it can carry. Due to the complexity of structural foundation failure, how to simulate the failure process accurately and how to select the most appropriate treatment measures is a process that needs to be improved continuously. In this paper, in the construction process of a reclaimed land artificial island project, the possible forms of different kinds of structural foundation failure are considered separately, and the following three contents: 1: 1) seepage failure is the important problem to be considered in the foundation of water conservancy project. In this paper, the seepage control problem of an artificial island reclamation project is studied by finite element method. In the absence of seepage prevention measures, the project is far larger than the allowable seepage slope value in places close to the inland river and offshore, which is likely to cause seepage damage, even to the buildings on the island. Due to the loss of infiltration, the water level of the inland river falls very rapidly, which leads to the water level of the inland river being insufficient to satisfy the navigation of the sightseeing ships. In this paper, the location of seepage gradient larger than the allowable maximum slope gradient is selected as the main anti-seepage body location under the most unfavorable working conditions, and then the design analysis is carried out. The results show that, after optimizing the anti-seepage measures, the seepage slope value is effectively lowered, and the water level of the inland river can be maintained for a longer period of normal navigation, so as to achieve the purpose of safe and stable operation of the soft soil foundation in the artificial island. Most buildings on the island are based on cast-in-place piles. Because of the existence of the mud crust on the side of the cast-in-place pile, the mode of contact between the cast-in-place pile and the soil becomes a pile, and the mode of contact between the mud and the soil decreases the bearing capacity of the single pile because of the softening of the mud-skin, resulting in the formation of the mud-skin defective pile. In this paper, the influence of mud skin on the bearing capacity of cast-in-place pile is analyzed by using finite element method, and it is proved that based on the feasibility and effectiveness of post-grouting construction technology to improve the bearing behavior of mud-sheathed pile, the high-rise building on the island is on the treated soft soil foundation. The settlement deformation of foundation is directly related to the safety of superstructure. Therefore, multiple settlement observation points should be arranged on the first floor during construction. The settlement of foundation is a complex nonlinear, dynamic geometric deformation process, and there must be a strong correlation among the settlement observation points. The method based on lie algebra can effectively solve the problem of correlation between settlement monitoring points from the point of view of Li Qun. In this paper, a high-rise building on the island is taken as an example. The dynamic analysis and integral prediction of the settlement of multiple monitoring points are carried out by using the Li Qun algorithm at the same time. It is proved that the prediction algorithm of group measuring points based on lie algebra is feasible and efficient in predicting foundation settlement of building structure.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU470

【參考文獻】

相關期刊論文 前10條

1 楊揚;盧坤林;朱大勇;;局部剪切破壞模式下的無重地基承載力[J];巖土力學;2014年01期

2 劉藝;;鑄鐵板翅式空氣預熱器在常減壓蒸餾加熱爐的應用[J];煉油技術與工程;2013年09期

3 彭浩;許模;郭健;肖宣煊;廖建;;水庫水位下降速率對滑坡穩(wěn)定性控制作用研究[J];人民黃河;2013年04期

4 王奎華;呂述暉;吳文兵;羅永健;武登輝;;考慮應力擴散時樁端土性對單樁沉降影響分析方法[J];巖土力學;2013年03期

5 張敏靜;羅強;詹學啟;張良;;高速鐵路穿透型CFG樁復合地基沉降計算修正系數分析[J];巖土力學;2013年02期

6 宮劍飛;石金龍;朱紅波;周圣斌;;高層建筑下大面積整體筏板基礎沉降原位測試分析[J];巖土工程學報;2012年06期

7 汪優(yōu);劉建華;王星華;蔡君君;;軟土地層橋梁群樁基礎樁土共同作用性狀的非線性有限元分析[J];巖土力學;2012年03期

8 史澤林;劉云鵬;李廣偉;;基于李代數的變形目標跟蹤[J];自動化學報;2012年03期

9 史佩棟;;我國深基礎工程技術發(fā)展現狀與展望:21世紀頭10a情況綜述[J];巖土工程學報;2011年S2期

10 董志高;董平;李俊才;張志鋮;;鉆孔灌注樁樁側泥皮分布對樁承載性狀影響研究[J];地質災害與環(huán)境保護;2010年04期

相關碩士學位論文 前10條

1 修林巖;海上大直徑鉆孔灌注樁施工技術淺析[D];山東大學;2013年

2 占川;樁土界面特性及其對灌注樁豎向承載性狀影響的試驗研究與數值分析[D];天津大學;2012年

3 楊彥麗;泥皮對灌注樁豎向承載性狀影響的數值模擬及試驗研究[D];天津大學;2012年

4 岳林飛;圍海造田地區(qū)吹填土的樁土共同作用有限元分析[D];西安建筑科技大學;2011年

5 張娟;堤壩飽和—非飽和滲流場數值模擬及穩(wěn)定性分析[D];大連理工大學;2009年

6 劉冰雪;海上風機樁基礎承載特性的三維有限元分析[D];大連理工大學;2009年

7 李勇;泥皮與沉渣對灌注樁承載性狀影響的數值模擬[D];天津大學;2008年

8 付祖良;鉆孔灌注樁水下混凝土灌注技術研究與應用[D];華中科技大學;2006年

9 張媛媛;ANSYS在土壩滲流場和應力場及其耦合分析中的應用研究[D];河海大學;2006年

10 張廣興;泥皮性狀對鉆孔樁工程特性的影響研究[D];浙江大學;2006年

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