本文選題：擴(kuò)底樁 + 承載能力　； 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：樁基承載力測(cè)定主要采用靜載試驗(yàn)法,對(duì)于擴(kuò)底樁來說,由于其承載力高,需要堆載大,不僅花費(fèi)時(shí)間長(zhǎng)、成本高并且靜載試驗(yàn)測(cè)出來的結(jié)果往往遠(yuǎn)低于擴(kuò)底樁實(shí)際的承載力。本文闡述了樁基的發(fā)展,分析了擴(kuò)底樁的國(guó)內(nèi)外專家學(xué)者的研究現(xiàn)狀與成果及擴(kuò)底樁的分類、技術(shù)特點(diǎn)以及適用場(chǎng)合,對(duì)比了兩種方法對(duì)擴(kuò)底樁承載力的確定。采用有限差分軟件FLAC3D進(jìn)行數(shù)值模擬,建立了一系列樁基模型,模擬分析發(fā)現(xiàn):在相同地質(zhì)條件下擴(kuò)底樁相比等徑樁具有明顯的承載優(yōu)勢(shì),施加2512kN時(shí),直徑為0.8m的等徑樁沉降量41.7mm,而上部直徑0.8m底端直徑2.0m的擴(kuò)底樁則只有7.3mm的沉降。這表明擴(kuò)底樁在荷載作用下不會(huì)一次性刺入土中,避免了應(yīng)力集中現(xiàn)象出現(xiàn)。當(dāng)?shù)葟綐哆_(dá)到最大沉降量時(shí),擴(kuò)底樁的樁底位移為14.0mm,仍能承受更大的荷載。擴(kuò)底樁與一般等徑樁,在同一土體中相同的樁長(zhǎng)、樁徑,當(dāng)沉降量均為20mm時(shí),擴(kuò)底樁承載力是等直徑樁的承載力的8倍。在相同載荷作用下,擴(kuò)底樁的沉降僅僅只有等直徑樁的1/5。并且隨著樁頂上部荷載的一級(jí)級(jí)的遞增,擴(kuò)底樁的樁底沉降量增加的無論是幅度還是速率都比等徑樁要小。數(shù)值模擬擴(kuò)底樁的承載能力,對(duì)工程實(shí)踐具有借鑒意義。
[Abstract]:The bearing capacity of pile foundation is mainly measured by static load test method. Because of its high bearing capacity and high heaped load, it takes a long time and high cost, and the results of static load test are often far lower than the actual bearing capacity of bottom pile. This paper expounds the development of pile foundation, analyzes the research status and achievements of experts and scholars at home and abroad, and the classification, technical characteristics and applicable situation of reamed pile, and compares the determination of bearing capacity of reamed pile with two methods. The finite difference software FLAC3D is used to carry out numerical simulation, and a series of pile foundation models are established. The simulation results show that under the same geological conditions, the pile with enlarged bottom has obvious advantages over equal-diameter pile, when 2512kN is applied. The settlement of equal-diameter pile with 0.8 m diameter is 41.7 mm, while that of the top pile with 0.8 m bottom diameter 2.0 m is only the settlement of 7.3mm. This indicates that the pile under the load will not burrow into the soil at one time, thus avoiding the phenomenon of stress concentration. When the maximum settlement of equal-diameter pile is reached, the displacement of pile bottom is 14.0mm, which can still bear larger load. When the settlement of the pile with the same length and diameter in the same soil mass is 20mm, the bearing capacity of the enlarged pile is 8 times of the bearing capacity of the equal-diameter pile. Under the same load, the settlement of the reamed pile is only 1 / 5 of that of the equal-diameter pile. With the increase of the first order of the load on the top of the pile, the settlement of the pile bottom of the reamed pile is smaller than that of the equal-diameter pile. Numerical simulation of bearing capacity of reamed pile has reference significance for engineering practice.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU473.1

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