本文選題：灌注樁套管　切入點：高頻振動　出處：《巖土力學》2015年11期

【摘要】：隨著全套管振動取土灌注樁施工工藝的發(fā)展,灌注樁在工程中的應用越來越廣泛,但關于灌注樁套管高頻振動貫入機制,特別是套管貫入引起的擠土效應研究還不全面。全面介紹了套管高頻振動貫入全過程的有限元-無限元耦合模型的建立過程后,對地表隆起、土體側移及超孔隙水壓力等擠土效應的變化規(guī)律進行了詳細研究。研究結果表明:水平向的擠土位移隨套管貫入深度的增加而增大,豎向擠土位移隨著套管貫入深度的增加,淺層土表現為隆起量增大,而深層土表現為下沉量增大;最大擠土位移與套管貫入深度存在滯后效應;淺層土體的隆起為水平向應力加載引起豎向應力增加所致,且隆起分界面深度隨著動力荷載幅值增大而增大,隨振動頻率的增大而減小;超孔隙水壓力隨套管貫入深度增加而增大,隨徑向距離增大呈指數型衰減。
[Abstract]:With the development of the construction technology of the whole set of tube-vibration earth-taking cast-in-place pile, the application of the cast-in-place pile in engineering is more and more extensive, but the research on the mechanism of high-frequency vibration penetration of the casing, especially the squeezing effect caused by the casing penetration, is not comprehensive.In this paper, the finite element coupling model of the whole process of casing high frequency vibration penetration is introduced in detail. The variation law of soil squeezing effect such as surface uplift, soil lateral displacement and excess pore water pressure is studied in detail.The results show that the horizontal displacement increases with the depth of casing penetration, the vertical displacement increases with the depth of casing penetration, the uplift of shallow soil increases and the depth of soil increases with the depth of casing penetration.The maximum soil displacement and casing penetration depth have hysteresis effect, the uplift of shallow soil is caused by the increase of vertical stress caused by horizontal stress loading, and the interface depth of uplift increases with the increase of dynamic load amplitude.With the increase of vibration frequency, the excess pore water pressure increases with the increase of casing penetration depth, and decreases exponentially with the increase of radial distance.
【作者單位】： 福州大學土木工程學院;
【基金】：國家自然科學基金項目(No.41272299)~~
【分類號】：TU753.3

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本文編號：1713299