黏性-砂性土层中群桩基础冲刷特性波流水槽试验研究
发布时间：2019-06-21 16:01
【摘要】：由黏性与砂性土层交互而成的复合地层在我国具有较为广泛的工程地质背景,目前对此类地层中的桩基础冲刷机理缺乏较为深入的研究。本文通过波流水槽试验,对黏性-砂性土层的局部冲刷机理进行了研究。在单桩试验中,上覆黏性土层分别采用0.5 cm和1.0 cm的两种厚度;在双桩的串排和并排试验中,均采用厚度1.0 cm的上覆黏性土进行冲刷试验,并与砂性土试验结果对比分析。试验结果表明,由于上部黏性土层产生一定的束缚作用,黏性-砂性土层中的冲刷往往比单一砂性土层的最终冲刷深度小;而冲刷发展过程中,由于黏性-砂性土分层界面的存在,使得冲刷曲线存在临界转折点,该临界点前后冲刷速率发生明显变化,这种突变在工程中存在着安全隐患。
[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.
【作者单位】： 同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;
【基金】：国家自然科学基金资助项目(41172246) 国家重点基础研究发展计划(2013CB036304)
【分类号】：TU473.1
，
本文编号：2504195
[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.
【作者单位】： 同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;
【基金】：国家自然科学基金资助项目(41172246) 国家重点基础研究发展计划(2013CB036304)
【分类号】：TU473.1
，
本文编号：2504195
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