本文選題：填海造陸 + 滲流破壞�。� 參考：《天津大學(xué)》2014年碩士論文

【摘要】：現(xiàn)代建筑結(jié)構(gòu)基礎(chǔ)的破壞通常有以下兩種形式,其一是建筑結(jié)構(gòu)基礎(chǔ)受到上部結(jié)構(gòu)長(zhǎng)期持續(xù)載荷作用發(fā)生沉降或者產(chǎn)生過(guò)大的沉降差,從而致使上部結(jié)構(gòu)嚴(yán)重沉陷和傾斜從而喪失使用價(jià)值;其二是由于結(jié)構(gòu)基礎(chǔ)受到遠(yuǎn)大于其所能承載的極限而發(fā)生破壞。由于結(jié)構(gòu)基礎(chǔ)破壞形式的復(fù)雜性,如何精確的進(jìn)行破壞過(guò)程的數(shù)值模擬以及選取最合適的處理措施是一個(gè)需要不斷完善的過(guò)程。本文在某填海造陸人工島工程的施工過(guò)程中分別考慮了可能存在的不同種類結(jié)構(gòu)基礎(chǔ)破壞的形式,主要研究以下三個(gè)內(nèi)容：(1)滲透破壞問(wèn)題是水利工程地基需要著重考慮的問(wèn)題。本文選取某填海造陸人工島工程(內(nèi)設(shè)內(nèi)河景觀工程)的防滲問(wèn)題進(jìn)行有限元分析研究。沒(méi)有采取防滲措施時(shí),該工程在內(nèi)河與外海地理位置相近的地方出現(xiàn)遠(yuǎn)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(nèi)河水位下降的十分迅速,導(dǎo)致內(nèi)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(jìn)行設(shè)計(jì)論證分析。結(jié)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(nèi)河水位可以維持正常航行的時(shí)間得到加長(zhǎng),達(dá)到能夠安全、穩(wěn)定運(yùn)行的目的。(2)人工島內(nèi)軟土地基,島上建筑物多采用灌注樁做基礎(chǔ)。由于灌注樁側(cè)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(duì)灌注樁承載力的影響,并且證明基于后注漿施工工藝對(duì)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(jīng)處理的軟土地基上,基礎(chǔ)沉降變形直接關(guān)系到上部結(jié)構(gòu)的安全。因此施工過(guò)程中要在第一層布置多個(gè)沉降觀測(cè)點(diǎn),隨著樓層的不斷加高,實(shí)時(shí)監(jiān)測(cè)。基礎(chǔ)沉降是一個(gè)復(fù)雜的非線性、動(dòng)態(tài)幾何變形過(guò)程,各沉降觀測(cè)點(diǎn)間必有很強(qiáng)的相關(guān)性。基于李代數(shù)的方法從李群的角度有效的解決了各沉降監(jiān)測(cè)點(diǎn)間的相關(guān)性問(wèn)題。本文以島上一高層建筑物為例,用李群算法同時(shí)對(duì)多個(gè)監(jiān)測(cè)點(diǎn)的沉降進(jìn)行動(dòng)態(tài)分析和整體性預(yù)測(cè),證明了基于李代數(shù)的群測(cè)點(diǎn)預(yù)測(cè)算法在預(yù)測(cè)建筑結(jié)構(gòu)基礎(chǔ)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(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
【分類號(hào)】：TU470

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