本文關(guān)鍵詞：不同傾斜角度單樁復(fù)合地基受力變形規(guī)律試驗(yàn)研究　出處：《長(zhǎng)沙理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 復(fù)合地基 傾斜樁 受力變形規(guī)律 破壞模式 試驗(yàn) 彎矩 軸力 摩阻力 側(cè)向土抗力

【摘要】：在樁體復(fù)合地基側(cè)向進(jìn)行堆載或卸載開(kāi)挖會(huì)對(duì)復(fù)合地基中樁體產(chǎn)生側(cè)向作用力,從而促使樁體產(chǎn)生側(cè)移,樁身會(huì)產(chǎn)生傾斜而成為傾斜樁。隨著傾斜角度的增加,樁體復(fù)合地基的承載能力會(huì)有所降低,但國(guó)內(nèi)外主要對(duì)傾斜基樁的承載能力進(jìn)行了相關(guān)的研究,采用的方法包括理論分析、數(shù)值計(jì)算、室內(nèi)模擬試驗(yàn)、現(xiàn)場(chǎng)測(cè)試等,獲得了許多寶貴的研究成果。對(duì)于傾斜樁復(fù)合地基的承載能力則較少涉及。本文對(duì)豎向加載條件下不同傾斜角度單樁復(fù)合地基的受力變形性狀以及破壞規(guī)律進(jìn)行了試驗(yàn)研究。在試驗(yàn)過(guò)程中,在樁頂、樁周土頂以及復(fù)合地基頂部分別設(shè)置沉降標(biāo)并連接百分表測(cè)試得到不同傾斜角度樁在豎向荷載作用下的沉降變化規(guī)律,在樁身兩側(cè)凹槽內(nèi)粘貼電阻應(yīng)變片測(cè)試不同傾斜角度單樁樁身彎矩以及軸力摩阻力變化規(guī)律,揭示了傾斜過(guò)程中復(fù)合地基受力變形規(guī)律以及單樁樁身的受力變化情況,結(jié)合理論分析取得了如下主要結(jié)論:(1)在相同的荷載作用下,隨著傾斜角度的增大單樁復(fù)合地基的沉降也不斷增加,證明傾斜角度增大對(duì)單樁復(fù)合地基的承載能力產(chǎn)生了不利的影響。(2)傾斜的單樁復(fù)合地基都產(chǎn)生了側(cè)向的移動(dòng),且樁頂部的側(cè)移要大于底部的側(cè)移,傾斜角度越大的單樁產(chǎn)生的側(cè)向位移也越大。(3)不同傾角單樁復(fù)合地基樁身彎矩情況不相同,樁身彎矩隨著傾斜角度的增大出現(xiàn)了較為復(fù)雜的變化,并且隨著傾斜角度的增大,樁身的最大彎矩也在不斷增加。(4)樁側(cè)摩阻力也隨著樁身傾斜角度的增加出現(xiàn)了較為明顯的變化,隨著傾斜角度的增加在樁身的相同位置出現(xiàn)了不同方向的側(cè)摩阻力,大小差別也較大,證明樁身傾斜對(duì)樁身側(cè)向摩阻力的分布影響非常明顯。(5)隨著傾斜角度的增加樁身受到的最大土抗力也在增大,并且隨著傾斜角度的增加在樁身的中下部產(chǎn)生了不同方向的側(cè)向土抗力,使樁身產(chǎn)生了彎矩而且隨著傾角的增大側(cè)向受力情況更為復(fù)雜,使樁身產(chǎn)生了更為復(fù)雜的彎矩變化,證明樁身傾斜對(duì)樁體本身造成了不利影響。
[Abstract]:The lateral loading or unloading excavation in the pile composite foundation will produce lateral force on the pile body in the composite foundation, which will promote the pile body to move sideways, and the pile body will be inclined and become inclined pile. With the increase of the inclined angle, the pile body will be inclined. The bearing capacity of pile composite foundation will be reduced, but the research on bearing capacity of inclined pile is mainly carried out at home and abroad. The methods adopted include theoretical analysis, numerical calculation and indoor simulation test. Field tests, etc. Many valuable research results have been obtained. The bearing capacity of inclined pile composite foundation is less concerned. The deformation behavior and failure law of single pile composite foundation with different inclined angles under vertical loading are studied in this paper. In the course of the experiment. At the top of the pile, the top of the soil around the pile and the top of the composite foundation, the settlement of the pile with different inclined angles under vertical load is obtained by setting the settlement scale and connecting the percentile meter. The resistance strain gauges on both sides of the pile body are used to test the bending moment and axial force friction of single pile with different inclined angles. The stress and deformation law of composite foundation and the stress change of single pile body are revealed in the process of inclination. The main conclusions of this paper are as follows: 1) under the same load combined with theoretical analysis. With the increase of inclined angle, the settlement of single pile composite foundation is also increasing. It is proved that the increase of inclined angle has an adverse effect on the bearing capacity of single pile composite foundation. (2) the single pile composite foundation with inclined slope produces lateral movement, and the lateral displacement of the pile top is greater than that of the bottom. The lateral displacement of single pile with larger inclined angle is also larger. 3) the bending moment of single pile composite foundation with different inclination angle is different, and the bending moment of pile body appears more complex change with the increase of inclined angle. And with the increase of the inclined angle, the maximum bending moment of the pile body is also increasing. 4) the frictional resistance of the pile side also appears more obvious change with the increase of the inclined angle of the pile body. With the increase of the inclined angle, the side friction in different directions appears in the same position of the pile body, and the magnitude is also different. It is proved that the influence of inclined pile body on the distribution of lateral friction is very obvious. 5) the maximum soil resistance of pile body is also increasing with the increase of inclined angle. And with the increase of the inclined angle, the lateral soil resistance in different directions is produced in the middle and lower part of the pile body, which makes the bending moment of the pile body and the lateral force situation more complicated with the increase of the inclination angle. The bending moment change of pile body is more complicated, which proves that the inclined pile body has adverse effect on pile body itself.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU473.1

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