【摘要】：由黏性與砂性土層交互而成的復(fù)合地層在我國(guó)具有較為廣泛的工程地質(zhì)背景,目前對(duì)此類(lèi)地層中的樁基礎(chǔ)沖刷機(jī)理缺乏較為深入的研究。本文通過(guò)波流水槽試驗(yàn),對(duì)黏性-砂性土層的局部沖刷機(jī)理進(jìn)行了研究。在單樁試驗(yàn)中,上覆黏性土層分別采用0.5 cm和1.0 cm的兩種厚度;在雙樁的串排和并排試驗(yàn)中,均采用厚度1.0 cm的上覆黏性土進(jìn)行沖刷試驗(yàn),并與砂性土試驗(yàn)結(jié)果對(duì)比分析。試驗(yàn)結(jié)果表明,由于上部黏性土層產(chǎn)生一定的束縛作用,黏性-砂性土層中的沖刷往往比單一砂性土層的最終沖刷深度小;而沖刷發(fā)展過(guò)程中,由于黏性-砂性土分層界面的存在,使得沖刷曲線存在臨界轉(zhuǎn)折點(diǎn),該臨界點(diǎn)前后沖刷速率發(fā)生明顯變化,這種突變?cè)诠こ讨写嬖谥踩[患。
[Abstract]:The composite strata formed by the interaction between viscous and sandy soil layers have a wide range of engineering geological background in China. At present, there is a lack of in-depth study on the scouring mechanism of pile foundation in this kind of strata. In this paper, the local scour mechanism of viscous and sandy soil layer is studied by wave current flume test. In the single pile test, the overlying clay layer adopts two kinds of thickness of 0.5 cm and 1.0 cm, respectively, and in the series and side-by-side tests of the two piles, the scour test is carried out with the overlying clay with thickness of 1.0 cm, and the results are compared with those of the sandy soil test. The experimental results show that due to the binding effect of the upper clay soil layer, the scour depth in the clay-sandy soil layer is often smaller than that in the single sandy soil layer, while in the process of scour development, there is a critical turning point in the scour curve due to the existence of the layered interface of the clay-sandy soil, and the scour rate changes obviously before and after the critical point, and this sudden change has a hidden danger of safety in the project.
【作者單位】： 同濟(jì)大學(xué)巖土及地下工程教育部重點(diǎn)實(shí)驗(yàn)室;同濟(jì)大學(xué)地下建筑與工程系;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(41172246) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2013CB036304)
【分類(lèi)號(hào)】：TU473.1
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本文編號(hào)：2504195