本文選題：傾斜樁 + 傾斜率　； 參考：《山東建筑大學(xué)》2017年碩士論文

【摘要】：隨著城市化進(jìn)程的加劇,樁偏斜事故出現(xiàn)頻率有上升趨勢。特別是近年來,基坑開挖、堆載、路堤荷載等原因產(chǎn)生的傾斜樁日益增多,這類樁常常伴有土體的水平向變形,即樁周土側(cè)向位移。到目前為止,對傾斜樁承載機(jī)理的研究還不深入,特別是對有樁周土側(cè)向位移傾斜樁的承載機(jī)理還處于空白階段,工程實踐中對有樁周土側(cè)向位移的傾斜樁加固常借用豎直樁的加固方法,這顯然不能合理反映傾斜樁的實際工作性狀,導(dǎo)致傾斜樁加固或設(shè)計保守,浪費嚴(yán)重;或重視不夠,補(bǔ)救方法不當(dāng),埋下工程隱患。因此,通過對傾斜樁和豎直樁在豎向承載性能和荷載傳遞規(guī)律的差別開展研究,進(jìn)而為傾斜樁加固提供技術(shù)支持,減少由于加固方案保守而造成資源浪費、或消除由于加固措施不到位而留下安全隱患,具有非常重要的實際意義。本文首先通過模型實驗研究了豎向荷載作用下無樁周土側(cè)向位移和有樁周土側(cè)向位移的三種傾斜率樁的豎向承載變形性狀,并與相應(yīng)豎直樁進(jìn)行了對比�？梢缘贸�,對于粉土土質(zhì)條件的樁身整體傾斜的樁,當(dāng)樁身傾斜率小于2%時,相同情況下,傾斜樁的樁頂豎向位移和端阻比基本不變;當(dāng)傾斜率大于4%時,傾斜樁豎向沉降和端阻比不再是判定其承載力的決定因素,水平位移逐漸成為關(guān)鍵因素。傾斜樁在極限荷載作用下樁傾斜一側(cè)和背離一側(cè)最大彎矩的樁身位置與樁傾斜率無關(guān),且隨著樁傾斜率的增大,樁身最大彎矩的絕對值逐漸增大。在模型試驗的基礎(chǔ)上,采用有限元分析重點研究了樁周土側(cè)向位移大小、樁周土側(cè)向位移作用范圍對傾斜樁豎向承載變形性狀及荷載傳遞機(jī)理的影響,并與相應(yīng)豎直樁進(jìn)行了對比�？梢缘贸�,對于粉土土質(zhì)條件和樁身整體傾斜的樁,隨著樁周土側(cè)向位移大小和豎向作用范圍的逐漸增大,樁頂豎向位移和水平位移逐漸增大。傾斜樁土壓力遞減較快范圍與樁傾斜率無關(guān),土壓力遞減較快范圍為樁傾斜一側(cè)5d和樁背離一側(cè)5d。當(dāng)傾斜率小于2%時,樁側(cè)摩阻力沿樁身分布情況類似于豎直樁;當(dāng)傾斜率大于2%時,樁頂以下0~7d范圍內(nèi),隨著傾斜率的增大,相同位置處樁側(cè)平均摩阻力逐漸增大;樁頂以下7d~40d范圍內(nèi),隨著傾斜率的增大,相同位置處樁側(cè)平均摩阻力基本不變。
[Abstract]:With the development of urbanization, the frequency of pile skew accidents is increasing. Especially in recent years, the inclined piles caused by excavation, surcharge and embankment load are increasing day by day. These piles are often accompanied by horizontal deformation of soil, that is, lateral displacement of soil around piles. Up to now, the research on bearing mechanism of inclined pile is not deep, especially the bearing mechanism of inclined pile with lateral displacement of soil around piles is still in blank stage. In engineering practice, the vertical pile is often used to reinforce the inclined pile with lateral displacement of soil around the pile, which obviously can not reflect the actual working behavior of the inclined pile, which leads to the reinforcement of the inclined pile or the conservative design of the pile, which is wasteful, or is not paid enough attention to. The remedy method is improper and the hidden trouble of the project is buried. Therefore, through the research on the difference between inclined pile and vertical pile in vertical bearing capacity and load transfer law, it can provide technical support for the reinforcement of inclined pile and reduce the waste of resources caused by conservative reinforcement scheme. It is of great practical significance to eliminate the hidden danger caused by the lack of reinforcement measures. In this paper, the behavior of vertical bearing deformation of three kinds of inclined pile with lateral displacement of soil around the pile and the lateral displacement of the soil around the pile under vertical load is studied by model experiment, and compared with the corresponding vertical pile. It can be concluded that for the pile with silty soil condition, when the slope ratio of pile body is less than 2, the vertical displacement of the pile top and the ratio of end resistance to resistance of the inclined pile are basically unchanged under the same condition, and when the slope ratio is greater than 4, Vertical settlement and end-resistance ratio of inclined pile are no longer the decisive factors to determine its bearing capacity, but horizontal displacement is becoming the key factor. The position of the maximum bending moment of the inclined pile under the ultimate load is independent of the slope ratio of the pile, and the absolute value of the maximum moment increases with the increase of the slope ratio of the pile. On the basis of model test, the effects of lateral displacement of soil around pile and the range of lateral displacement of soil around pile on vertical bearing deformation behavior and load transfer mechanism of inclined pile are studied by finite element analysis. The results are compared with the corresponding vertical piles. It can be concluded that the vertical displacement and horizontal displacement of the top of the pile increase with the increase of the lateral displacement and the vertical action range of the soil around the pile for the silty soil condition and the whole inclined pile body. The rapid decline range of soil pressure of inclined pile has nothing to do with the slope ratio of pile. The quick range of soil pressure decline is 5 days on the inclined side of the pile and 5 days on the deviating side of the pile. When the slope ratio is less than 2, the frictional resistance distribution along the pile body is similar to that of the vertical pile, and when the slope ratio is greater than 2, the average frictional resistance of the pile side increases gradually with the increase of the slope ratio in the range of 0 ~ 7 days below the top of the pile. In the range of 7d~40d below the top of the pile, with the increase of the slope ratio, the average frictional resistance of the pile side at the same position is basically unchanged.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1

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