本文選題：樁基 + 大直徑�。� 參考：《重慶交通大學》2014年碩士論文

【摘要】：樁基礎具有承載力高、穩(wěn)定性好、基礎沉降及差異變形小、抗震性能好及具有對各種地質條件的適用性強等優(yōu)點,被廣泛應用于高層建筑、近海采油、大型橋梁工程建設、海岸碼頭及大型動力機器基礎等實際工程中。隨著土木建筑行業(yè)的發(fā)展,建筑結構的高度越來越高、且由于地址條件的日益不確定性及建筑結構與環(huán)境的關系日趨緊密,研究管樁基礎在橫向荷載作用下及豎向荷載作用下的內力、變形及破壞機理可以更好的解決工程實際問題。本文的研究工作如下:①研究豎向荷載與水平荷載下作用下管樁與土共同作用的方法,提出了各種方法的適用范圍以及優(yōu)缺點,因此在數(shù)值計算過程中,需要選擇與工程相適應的計算方法,以提高計算結果的精度。②建立符合實際的大直徑管樁模型,其中探討了有限元建模時應注意單元選取原則及單元的選取;對比分析了三維及二維有限元管樁模型在豎向荷載作用下樁體的受力計算結果,得出用二維有限元模型可以代替三維模型進行管樁—土共同作用下的受力性狀進行分析,結果能夠滿足要求。③研究豎向荷載作用下不同管樁參數(shù)對管樁受力性狀及工作性能影響,得出不同結構參數(shù)對管樁的受力性狀的影響程度,為選取合理的管樁參數(shù)以提高管樁的安全性及其工作性能的發(fā)揮提供依據(jù)。④探討了水平荷載作用下不同管樁參數(shù)對管樁受力性狀及工作性能影響,得出水平荷載作用下不同結構參數(shù)對管樁的樁身彎矩及水平位移的影響程度,以及豎向荷載對水平荷載作用下樁體的承載能力影響,并提出樁體受力破壞的結構構造措施,以提高水平荷載作用下樁基的安全性。
[Abstract]:The pile foundation has the advantages of high bearing capacity, good stability, small settlement and differential deformation, good seismic performance and strong applicability to various geological conditions. It has been widely used in high-rise buildings, offshore oil production and large-scale bridge construction. Coastal wharf and large-scale power machine foundation and other practical projects. With the development of civil construction industry, the height of building structure is higher and higher, and because of the uncertainty of address condition and the relationship between building structure and environment, Studying the internal force, deformation and failure mechanism of pipe pile foundation under transverse load and vertical load can better solve the practical engineering problems. The research work of this paper is as follows: 1. The methods of interaction between pipe pile and soil under vertical and horizontal loads are studied, and the applicable scope, advantages and disadvantages of these methods are put forward, so in the process of numerical calculation, In order to improve the accuracy of the calculation results, the practical large-diameter pipe pile model should be established. The principle of element selection and the selection of element should be paid attention to in finite element modeling. This paper compares and analyzes the calculation results of three dimensional and two dimensional finite element pipe pile model under vertical load, and concludes that the two dimensional finite element model can be used instead of three dimensional model to analyze the mechanical behavior of pipe pile and soil under the action of pipe pile and soil. The results can meet the requirement of .3 to study the influence of different parameters of pipe pile on the mechanical behavior and working performance of pipe pile under vertical load, and the degree of influence of different structural parameters on the mechanical behavior of pipe pile is obtained. In order to select reasonable pipe pile parameters to improve the safety and performance of pipe pile, the influence of different pipe pile parameters on the mechanical behavior and working performance of pipe pile under horizontal load is discussed. The influence of different structural parameters on the bending moment and horizontal displacement of pipe pile under horizontal load and the influence of vertical load on the bearing capacity of pile under horizontal load are obtained. In order to improve the safety of pile foundation under horizontal load.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU473.1

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本文編號：1778658