考慮負(fù)摩阻力的剛性樁復(fù)合地基中性面深度及樁土應(yīng)力比計(jì)算
本文關(guān)鍵詞:考慮負(fù)摩阻力的剛性樁復(fù)合地基中性面深度及樁土應(yīng)力比計(jì)算 出處:《巖土工程學(xué)報(bào)》2016年02期 論文類(lèi)型:期刊論文
更多相關(guān)文章: 剛性樁復(fù)合地基 負(fù)摩阻力 中性面深度 樁土應(yīng)力比 影響因素
【摘要】:研究了剛性樁復(fù)合地基樁側(cè)摩阻力在線性模式下中性面深度及樁土應(yīng)力比的計(jì)算方法。根據(jù)剛性樁復(fù)合地基各組成部分的沉降變形關(guān)系,推導(dǎo)了墊層 樁 土的變形協(xié)調(diào)方程?紤]負(fù)摩阻力對(duì)樁土工作性狀的影響,將樁側(cè)摩阻力分布由試驗(yàn)曲線簡(jiǎn)化為線性模式,同時(shí)考慮樁頂刺入褥墊層,樁底刺入下臥層,結(jié)合樁土變形協(xié)調(diào)方程推導(dǎo)了中性面深度、樁頂平面樁土應(yīng)力比、中性面樁土應(yīng)力比的計(jì)算公式。分析了多種因素對(duì)中性面深度及樁土應(yīng)力比的影響,結(jié)果表明:剛性樁復(fù)合地基的中性面深度比在0.15~0.35之間,中性面樁土應(yīng)力比相比樁頂平面樁土應(yīng)力比增大10%~40%。最后應(yīng)用于某工程現(xiàn)場(chǎng)載荷試驗(yàn)和某剛性樁復(fù)合地基模型試驗(yàn),計(jì)算值與試驗(yàn)值吻合較好。
[Abstract]:In this paper, the method of calculating the neutral surface depth and pile-soil stress ratio of rigid pile composite foundation under linear model is studied, and the settlement and deformation relations of each component of rigid pile composite foundation are analyzed. The deformation coordination equation of cushion pile and soil is derived. Considering the influence of negative friction on the working behavior of pile and soil, the distribution of pile side friction is simplified from the test curve to a linear model, and the pile top impinging into the cushion layer is considered at the same time. The depth of neutral plane and the stress ratio of pile to soil on the top of the pile are derived by means of the pile bottom impinging into the lower horizontal layer and combining with the pile soil deformation coordination equation. The influence of various factors on the neutral plane depth and pile-soil stress ratio is analyzed. The results show that the neutral depth ratio of rigid pile composite foundation is between 0.15 and 0.35. The stress ratio of neutral plane pile to soil is increased by 10% and 40% compared with the pile top plane pile-soil stress ratio. Finally, it is applied to the field load test of a certain project and the model test of a rigid pile composite foundation. The calculated value is in good agreement with the test value.
【作者單位】: 燕山大學(xué)建筑工程與力學(xué)學(xué)院;燕山大學(xué)科學(xué)技術(shù)研究院;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(51408527) 秦皇島市科學(xué)技術(shù)研究與發(fā)展計(jì)劃項(xiàng)目(201302A220)
【分類(lèi)號(hào)】:TU473.1
【正文快照】: 0引言剛性樁復(fù)合地基是近年來(lái)發(fā)展較快的一種地基處理技術(shù),其由褥墊層、剛性樁以及樁間土3部分組成。由于褥墊層的設(shè)置,上部荷載通過(guò)褥墊層作用在樁和樁間土上,樁土協(xié)調(diào)變形,使樁間土始終參與承載工作,因此有較好的經(jīng)濟(jì)性;相比在多層建筑中應(yīng)用較多的柔性樁復(fù)合地基,剛性樁復(fù)
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