本文選題：復(fù)合地基 + CFG樁��； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：CFG樁復(fù)合地基作為地基處理的主要手段之一，已經(jīng)得到越來越廣泛的應(yīng)用。目前剛性基礎(chǔ)下CFG樁復(fù)合地基已形成了相對完整的理論體系和設(shè)計(jì)方法，而柔性基礎(chǔ)下CFG樁復(fù)合地基的理論分析和設(shè)計(jì)方法尚不成熟，尤其在尾礦庫這種特殊地基上的處治技術(shù)在我國還處于空白階段，因此有必要開展CFG樁處治飽和尾礦砂地基的沉降、承載力及孔隙水壓力等特性的研究。 本文通過對尾礦砂進(jìn)行一系列基本物理實(shí)驗(yàn)，研究其基本物理性質(zhì)，同時(shí)利用相似模型理論，依托現(xiàn)場工況開展CFG樁處理飽和尾礦砂地基的室內(nèi)模型試驗(yàn)，在飽和尾礦砂中埋設(shè)位移計(jì)、孔隙水壓力計(jì)、土壓力盒等，，以便探索在上部加載變化的情況下，CFG樁復(fù)合地基的沉降、孔隙水壓力、樁間土壓力和樁頂壓力的變化規(guī)律。 試驗(yàn)結(jié)果表明，當(dāng)CFG復(fù)合地基施加上部荷載時(shí)，在短時(shí)間內(nèi)產(chǎn)生較大沉降變形，但隨著時(shí)間的推移，樁的承載能力發(fā)揮出來，地基沉降量的變化不再顯著，最終維持在一個(gè)較穩(wěn)定的狀態(tài)。在承受上部荷載的時(shí)候，土體中間位置相較于其他位置沉降更大。CFG復(fù)合地基的孔隙水壓力隨著深度的增加呈現(xiàn)出增大的趨勢，但其變化幅度隨著深度增加逐漸變緩，土體中心處的孔隙水壓力隨時(shí)間的變化較平穩(wěn)。排水會(huì)導(dǎo)致孔隙水壓力急劇下降并最終穩(wěn)定。在分級(jí)荷載條件下復(fù)合地基模型的樁頂壓力和樁底壓力都隨著上部荷載增加的不斷增加，而樁間土的壓力變化范圍波動(dòng)很大，缺乏規(guī)律性。加載過程中，樁土應(yīng)力比持續(xù)上升，排水階段對樁土應(yīng)力比的影響顯著，應(yīng)力比值下降，說明樁間土承載力的增長幅度大于樁頂處。
[Abstract]:As one of the main methods of foundation treatment, CFG pile composite foundation has been used more and more widely. At present, CFG pile composite foundation under rigid foundation has formed a relatively complete theoretical system and design method, but the theoretical analysis and design method of CFG pile composite foundation under flexible foundation is still immature. Especially, the treatment technology of tailings reservoir is still in blank stage in our country, so it is necessary to study the settlement, bearing capacity and pore water pressure of saturated tailings foundation treated by CFG pile. In this paper, a series of basic physical experiments on tailings are carried out, and the basic physical properties of the tailings are studied. At the same time, by using the theory of similar model, the laboratory model tests of treating saturated tailings foundation with CFG piles are carried out under the field working conditions. Displacement gauge, pore water pressure gauge and earth pressure box are embedded in saturated tailings in order to explore the variation law of settlement, pore water pressure, soil pressure and top pressure of CFG pile composite foundation under the change of upper load. The experimental results show that when the upper load is applied on the CFG composite foundation, large settlement deformation occurs in a short period of time, but with the passage of time, the bearing capacity of the pile exerts its bearing capacity and the settlement of the foundation does not change significantly. Eventually, it is maintained in a more stable state. When bearing the upper load, the pore water pressure of the soil in the middle position is larger than that in the other places. The pore water pressure of the composite foundation increases with the increase of depth, but the variation range of the pore water pressure increases slowly with the increase of the depth. The pore water pressure in the center of soil is stable with time. Drainage can cause pore water pressure to drop sharply and eventually stabilize. Under the condition of graded load, the pile top pressure and pile bottom pressure of composite foundation model increase with the increase of upper load, but the variation range of soil pressure between piles fluctuates greatly and lacks regularity. During the loading process, the pile-soil stress ratio continues to increase, the drainage stage has a significant effect on the pile-soil stress ratio, and the stress ratio decreases, which indicates that the increasing range of soil bearing capacity between piles is greater than that of pile top.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.1;U414.1

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