本文選題：PIV技術(shù)　切入點(diǎn)：模型試驗(yàn)　出處：《工程力學(xué)》2014年08期

【摘要】：基于粒子圖像測(cè)速(PIV)技術(shù),利用自行設(shè)計(jì)的靜壓樁自動(dòng)沉樁模型試驗(yàn)系統(tǒng),對(duì)沉樁過(guò)程中樁周土體位移場(chǎng)進(jìn)行測(cè)量。在沉樁過(guò)程中,利用CCD(charge coupled device)高速工業(yè)相機(jī)連續(xù)拍攝試驗(yàn)觀測(cè)面上樁周土體變形的灰度圖像,然后對(duì)初始點(diǎn)和峰值點(diǎn)進(jìn)行分析,得到位移場(chǎng)分布。研究了不同沉樁深度、樁-土摩擦系數(shù)和樁尖形式情況下沉樁對(duì)周?chē)馏w位移場(chǎng)的影響規(guī)律;相應(yīng)試驗(yàn)結(jié)果與圓孔擴(kuò)張理論解進(jìn)行對(duì)比分析,其徑向位移變形的規(guī)律基本一致,驗(yàn)證了模型試驗(yàn)的可靠性。相對(duì)常規(guī)試驗(yàn)方法,該試驗(yàn)操作簡(jiǎn)便,對(duì)環(huán)境要求不高,可以進(jìn)行非插入式全場(chǎng)測(cè)量。研究結(jié)果表明:在該文試驗(yàn)條件下,對(duì)于平底圓樁,沉樁過(guò)程對(duì)樁側(cè)土體位移影響范圍在8R附近,對(duì)樁端底部土體影響范圍在4R附近;樁身摩擦的存在使得樁側(cè)向土體位移影響范圍增大2R左右,對(duì)樁端底部土體位移基本沒(méi)有影響。當(dāng)樁尖角度由0°變化為45°時(shí),樁側(cè)的水平和豎向位移均增大,樁端底部的豎向位移明顯減小;而樁身摩擦對(duì)其水平位移和豎向位移影響不大。
[Abstract]:Based on the particle image velocimetry (PIV) technique, the displacement field of soil around the pile was measured by using the self-designed model test system of static pressure pile automatic piling.In the process of piling, CCD(charge coupled device high speed industrial camera was used to continuously photograph the grayscale images of the soil deformation around the pile surface, then the initial point and the peak point were analyzed, and the displacement field distribution was obtained.The effects of pile-soil friction coefficient and pile-tip form on the displacement field of surrounding soil are studied, and the corresponding experimental results are compared with the theoretical solution of circular hole expansion, and the radial displacement and deformation are basically the same.The reliability of the model test is verified.Compared with the conventional test method, the test is easy to operate and does not require high environmental requirements, so it can be used for non-plug-in field measurement.The results show that for circular pile with flat bottom, the influence range of pile-driving process on soil displacement of pile side is near 8R, and that on soil at the end of pile is near 4R.The existence of pile friction increases the influence range of lateral soil displacement by 2R, and has no effect on the soil displacement at the end and bottom of the pile.When the angle of the pile tip changes from 0 擄to 45 擄, the horizontal and vertical displacement of the pile side increases, and the vertical displacement at the bottom of the pile tip decreases obviously, while the friction of the pile body has little effect on the horizontal displacement and the vertical displacement.
【作者單位】： 河海大學(xué)巖土力學(xué)與堤壩工程教育部重點(diǎn)實(shí)驗(yàn)室;河海大學(xué)土木與交通學(xué)院;
【基金】：國(guó)家自然科學(xué)基金高鐵聯(lián)合基金項(xiàng)目(U1134207);國(guó)家自然科學(xué)基金項(xiàng)目(51278170) 長(zhǎng)江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃項(xiàng)目(IRT1125)
【分類(lèi)號(hào)】：TU435

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