本文選題：樁基礎(chǔ) + 模型試驗(yàn)��； 參考：《水利學(xué)報(bào)》2015年S1期

【摘要】：為了掌握沖刷前后樁基礎(chǔ)水平承載性能的變化規(guī)律,通過(guò)自行設(shè)計(jì)加工的水平加載裝置,進(jìn)行了一系列不同沖刷深度下的樁基室內(nèi)模型試驗(yàn),獲得在不同水平荷載作用下樁頭水平位移以及沿樁身的應(yīng)變,掌握沖刷作用對(duì)樁基水平承載性能的影響。在此基礎(chǔ)上,采用FLAC3D軟件模擬單樁在水平荷載作用下的承載性能,并依據(jù)模型試驗(yàn)結(jié)果修正數(shù)值模型相應(yīng)參數(shù),獲得能考慮沖刷作用影響的單樁計(jì)算模型。用該計(jì)算模型對(duì)沖刷角、樁頂固定方式和不同沖刷深度下單樁的水平承載力性狀進(jìn)行分析,得出如下結(jié)論:當(dāng)沖刷深度小于1.5倍樁徑時(shí),水平極限承載力受沖刷影響較小;而當(dāng)沖刷深度達(dá)到大于2倍樁徑,小于8倍樁徑時(shí),水平極限承載力受沖刷影響較大,下降幅值達(dá)到80%;當(dāng)沖刷深度繼續(xù)增大,水平極限承載力下降趨于平緩;在一定的沖刷深度下,當(dāng)沖刷范圍變化時(shí),樁基側(cè)向承載力變化不明顯;樁頭固定有利于減小沖刷對(duì)樁基承載力的影響。
[Abstract]:In order to understand the variation law of pile foundation's horizontal bearing capacity before and after scouring, a series of indoor model tests of pile foundation with different scour depth were carried out through the horizontal loading device designed and processed by ourselves. The horizontal displacement of the pile head and the strain along the pile body are obtained under different horizontal loads, and the effect of scour on the horizontal bearing capacity of the pile foundation is grasped. On this basis, the load-bearing behavior of single pile under horizontal load is simulated by FLAC3D software, and the corresponding parameters of numerical model are modified according to the results of model test, and the calculation model of single pile which can take into account the effect of scour is obtained. The calculation model is used to analyze the horizontal bearing capacity behavior of the pile with different scour depth, such as scour angle, pile top fixation mode and different scour depth. The following conclusions are drawn: when the scour depth is less than 1.5 times of the diameter of the pile, the horizontal ultimate bearing capacity is less affected by scour; When the scour depth is more than 2 times of pile diameter and less than 8 times of pile diameter, the horizontal ultimate bearing capacity is greatly affected by scour, the decreasing amplitude reaches 80, and when the scour depth increases, the horizontal ultimate bearing capacity decreases slowly. Under certain scour depth, the lateral bearing capacity of pile foundation does not change obviously when the scour range changes, and the fixing of pile head is helpful to reduce the influence of scour on the bearing capacity of pile foundation.
【作者單位】： 武漢理工大學(xué)交通學(xué)院結(jié)構(gòu)工程系;
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)資金資助項(xiàng)目(2014-Ⅳ-108)
【分類(lèi)號(hào)】：TU473.1
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本文編號(hào)：1958765