本文選題：濕陷性黃土　切入點(diǎn)：橋梁樁基　出處：《長(zhǎng)安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：由于濕陷性黃土引起的工程事故屢見(jiàn)不鮮，在眾多的經(jīng)驗(yàn)教訓(xùn)之后，我們雖然對(duì)黃土地區(qū)樁基工程設(shè)計(jì)問(wèn)題有一些局部認(rèn)識(shí)和實(shí)踐經(jīng)驗(yàn)，但是還是缺少更透徹的研究，所以該問(wèn)題也更多的受到了各界的重視。提出一套適用的濕陷性黃土區(qū)樁基設(shè)計(jì)技術(shù)體系，對(duì)當(dāng)下的工程建設(shè)來(lái)說(shuō)尤為要緊且緊迫。為了深入研究濕陷性黃土區(qū)樁基的承載特性，本文總結(jié)了大量工程試驗(yàn)的數(shù)據(jù)資料，并且采用先進(jìn)的數(shù)值模擬手段和傳統(tǒng)理論計(jì)算相結(jié)合的方式來(lái)分析該問(wèn)題，得出若干結(jié)論，以期對(duì)當(dāng)下橋梁工程設(shè)計(jì)及施工有所助益。 本文基于剪切位移法及彈性理論，推導(dǎo)了自重濕陷性黃土條件下樁基沉降、軸力及中性點(diǎn)計(jì)算公式。并利用有限元差分軟件（FLAC3D）建立橋梁樁基單樁空間軸對(duì)稱有限元模型；結(jié)合此模型采用疊加法計(jì)算自重濕陷性黃土地區(qū)合理樁長(zhǎng)，得出當(dāng)中性點(diǎn)上、下土層摩擦力分布形式相同時(shí)，應(yīng)增加的樁長(zhǎng)與摩擦力的分布形式無(wú)關(guān)，而只與極限摩擦力的大小有關(guān)的結(jié)論。運(yùn)用此方法分析自重濕陷性黃土濕陷特性對(duì)樁基承載性狀的影響規(guī)律，結(jié)果表明：在極限荷載時(shí)，中性點(diǎn)深度與樁長(zhǎng)有關(guān)；濕陷系數(shù)對(duì)樁剩余承載力的影響是非線性的；定量給出了中性點(diǎn)深度及應(yīng)增加樁長(zhǎng)的范圍。 最后將上述理論及模擬計(jì)算結(jié)果與樁基現(xiàn)場(chǎng)浸水加載試驗(yàn)數(shù)據(jù)進(jìn)行比對(duì)，對(duì)比結(jié)果顯示了本文所建樁基計(jì)算模型是正確合理的。
[Abstract]:Because It is often seen. engineering accident caused by collapsible loess, after numerous lessons, although we have some local knowledge and practice experience for the design of pile foundation engineering in loess area, but still lack a more thorough study, this problem has been more attention from all walks of life. A set of collapsible foundation design technical system of loess area, the current construction is particularly important and urgent. In order to further study the bearing characteristics of pile foundation in collapsible loess area, this paper summarizes a large number of engineering test data, and combined with advanced mining calculation methods of numerical simulation and traditional theory method to analyze the problems, some conclusions are drawn, expecting to be helpful to the design and construction of the bridge project.
In this paper, the shear displacement method and based on the elastic theory, deduced the weight of pile foundation in collapsible loess under the condition of settlement calculation formula and the neutral axis force. And difference by using the finite element software (FLAC3D) to establish the axisymmetric finite element model of bridge pile foundation pile space; this model combined with the superposition calculation of collapsible loess area reasonable pile length, when the neutral point, under the soil friction distribution form is the same, regardless of the distribution form of added pile length and friction, and friction force and limit the conclusions. By using the method of self weight collapsible loess characteristics influence of the character of the pile bearing results show that: in the limit load, the depth of neutral point and the pile length; influence coefficient of collapsibility of pile residual bearing capacity is nonlinear; given the depth of neutral point and should increase the range of pile length.
Finally, the above theory and simulation results are compared with the data of in-situ immersion test of pile foundation, and the comparison results show that the pile foundation calculation model established in this paper is correct and reasonable.

【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U443.15

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