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

【摘要】：基于粒子圖像測速(PIV)技術(shù),利用自行設(shè)計的靜壓樁自動沉樁模型試驗系統(tǒng),對沉樁過程中樁周土體位移場進行測量。在沉樁過程中,利用CCD(charge coupled device)高速工業(yè)相機連續(xù)拍攝試驗觀測面上樁周土體變形的灰度圖像,然后對初始點和峰值點進行分析,得到位移場分布。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周圍土體位移場的影響規(guī)律;相應試驗結(jié)果與圓孔擴張理論解進行對比分析,其徑向位移變形的規(guī)律基本一致,驗證了模型試驗的可靠性。相對常規(guī)試驗方法,該試驗操作簡便,對環(huán)境要求不高,可以進行非插入式全場測量。研究結(jié)果表明:在該文試驗條件下,對于平底圓樁,沉樁過程對樁側(cè)土體位移影響范圍在8R附近,對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,對樁端底部土體位移基本沒有影響。當樁尖角度由0°變化為45°時,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】： 河海大學巖土力學與堤壩工程教育部重點實驗室;河海大學土木與交通學院;
【基金】：國家自然科學基金高鐵聯(lián)合基金項目(U1134207);國家自然科學基金項目(51278170) 長江學者和創(chuàng)新團隊發(fā)展計劃項目(IRT1125)
【分類號】：TU435

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