【摘要】：影響管樁水平承載性能的因素很多,主要包括樁周土土體強(qiáng)度、樁身強(qiáng)度、樁長(zhǎng)、樁身截面大小、樁身豎向荷載大小、管樁填芯等。然而大多數(shù)關(guān)于管樁的水平承載性能的研究,只是改變某一個(gè)因素對(duì)管樁水平承載性能的影響,而忽略了樁水平承載性能是由多種因素相互影響相互作用而形成的一種外在的力學(xué)特性。因此考慮多種因素對(duì)管樁水平承載性能的影響,更加貼近工程實(shí)際。根據(jù)工程實(shí)際,管樁承受豎向荷載不可避免。因此本文通過(guò)考慮不同豎向荷載以及不同填芯強(qiáng)度情況下,通過(guò)室內(nèi)試驗(yàn)以及數(shù)值模擬對(duì)管樁的水平承載性能進(jìn)行對(duì)比研究。研究結(jié)果表明,水平加載初期水平荷載較小,樁身剛度遠(yuǎn)大于土體,樁身位移較小,水平承載主要靠土體抗力,樁頂位移主要有土體壓縮產(chǎn)生,不同填芯及豎向荷載組合管樁的水平承載性能比較接近。水平加載中后期,樁身位移增大,管樁填芯部分及P-Δ效應(yīng)作用明顯,不同填芯及豎向荷載組合對(duì)管樁水平承載性能提高主要出現(xiàn)在水平荷載加載中后期;在不同豎向荷載及填芯組合對(duì)管樁的水平承載性能的數(shù)值模擬研究中發(fā)現(xiàn),存在最優(yōu)豎向荷載及填芯組合對(duì)管樁的水平承載性能提高最大,當(dāng)樁身位移較大或者出現(xiàn)傾斜時(shí),最優(yōu)管樁水平承載性能組合不是豎向荷載最大與填芯強(qiáng)度最高組合;當(dāng)管樁樁身位移較小時(shí),最優(yōu)管樁水平承載性能組合為最大豎向荷載與最大填芯強(qiáng)度組合。
[Abstract]:There are many factors that affect the horizontal bearing capacity of pipe piles, including soil strength, pile body strength, pile length, pile cross-section, vertical load, core filling and so on. However, most researches on the horizontal bearing capacity of pipe pile only change the influence of one factor on the horizontal bearing capacity of pipe pile. The lateral bearing capacity of pile is a kind of external mechanical property which is formed by the interaction of many factors. Therefore, considering the influence of many factors on the horizontal bearing capacity of pipe pile, it is closer to engineering practice. According to the engineering practice, the vertical load of pipe pile is inevitable. In this paper, the horizontal bearing capacity of pipe pile is studied by laboratory test and numerical simulation considering different vertical loads and different core filling strength. The results show that at the initial stage of horizontal loading, the horizontal load is small, the stiffness of pile body is much larger than that of soil, the displacement of pile body is smaller, the horizontal load is mainly dependent on soil resistance, and the displacement of pile top is mainly caused by soil compression. The horizontal bearing capacity of different core-filled and vertical load composite pipe piles is similar. In the middle and late stage of horizontal loading, the displacement of pile body increases, and the effect of core filling and P- 螖 effect on pipe pile is obvious. The improvement of horizontal bearing capacity of pipe pile by different core-filling and vertical load combinations mainly occurs in the middle and late stage of horizontal load loading. In the numerical simulation of the horizontal bearing capacity of pipe piles under different vertical loads and core-filled combinations, it is found that there is an optimal vertical load and core-filled combination that can improve the horizontal load performance of pipe piles most, and when the displacement of pile body is large or inclined, The optimal combination of horizontal bearing capacity of pipe pile is not the combination of the maximum vertical load and the highest core-filling strength. When the displacement of pipe pile is small, the optimal combination of horizontal bearing capacity of pipe pile is the combination of maximum vertical load and maximum core filling strength.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU473.1

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