【摘要】：樁基是海洋平臺(tái)、海洋風(fēng)力發(fā)電機(jī)、海上輸電塔等近海工程基礎(chǔ)的主要形式，主要用來(lái)抵抗波浪荷載和風(fēng)荷載等水平荷載。研究樁基在水平荷載作用下的表現(xiàn)形式的方法有很多種，p-y曲線法是國(guó)內(nèi)外最為廣泛使用的方法。砂土和軟粘土的p-y曲線研究起步最早，也最成熟，而對(duì)于黃河三角洲新近沉積粉質(zhì)土的p-y曲線研究尚缺乏研究。 本文針對(duì)黃河三角洲地區(qū)，以新沉積粉土為地基土，通過(guò)室內(nèi)水平加載試驗(yàn)，根據(jù)樁身彎矩、樁身水平位移和樁周土抗力三者之間的關(guān)系，得出黃河三角洲地區(qū)飽和粉土地基單樁p-y曲線，并與現(xiàn)有的五種p-y曲線進(jìn)行比較，，最終以雙曲線型p-y曲線形式，得出了適用于黃河三角洲粉質(zhì)土地區(qū)p-y曲線計(jì)算方法。 文中詳細(xì)介紹了水平荷載作用下單樁工作性狀和承載力的幾種計(jì)算方法，對(duì)比得出p-y曲線法的優(yōu)點(diǎn)。介紹了本文模型試驗(yàn)的原理、模型的制作方法以及模型樁抗彎剛度的計(jì)算。通過(guò)四組對(duì)比試驗(yàn)，得出了模型樁的埋置方式、加載點(diǎn)位置以及地基土超固結(jié)對(duì)p-y曲線的影響。
[Abstract]:Pile foundation is the main form of offshore engineering foundation, such as offshore platform, offshore wind turbine and offshore transmission tower, which is mainly used to resist horizontal loads such as wave load and wind load. There are many methods to study the expression of pile foundation under horizontal load. The p-y curve method is the most widely used method at home and abroad. The study on p-y curve of sandy soil and soft clay is the first and most mature, but the study of p-y curve of newly deposited silty soil in the Yellow River Delta is still lacking. In this paper, according to the relationship among bending moment, horizontal displacement of pile body and resistance of soil around pile, the newly deposited silt is taken as foundation soil in the Yellow River Delta region, and through indoor horizontal loading test, the relationship between pile bending moment, horizontal displacement of pile body and resistance of soil around pile is discussed. The p-y curves of single pile on saturated silt foundation in the Yellow River Delta region are obtained, and compared with five kinds of p-y curves. Finally, the calculation method of p-y curve is obtained in the form of hyperbolic p-y curve, which is suitable for the silty soil area of the Yellow River Delta. In this paper, several calculation methods of the working behavior and bearing capacity of the pile under horizontal load are introduced in detail, and the advantages of p-y curve method are compared. This paper introduces the principle of the model test, the method of making the model and the calculation of the bending stiffness of the model pile. Through four groups of comparative tests, the influence of the buried mode of the model pile, the position of the loading point and the over-consolidation of the foundation soil on the p-y curve is obtained.
【學(xué)位授予單位】：中國(guó)海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：P751

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本文編號(hào)：2273512