Centrifugal model tests on bearing capacity of uplift piles under deep excavation
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摘要: 深开挖条件下抗拔桩的承载力问题正受到越来越多的岩土工程师和科研人员的重视，对这个问题的理论研究也正在逐步开展，但由于实际工程情况限制，往往工程现场无法进行原位试桩，对理论研究成果也就无法直接进行验证。基于此，采用室内离心模型试验来代替现场原位试验，通过开挖前后抗拔单桩的离心模型试验全面的考察开挖前后抗拔桩的承载力变化特性，分析开挖前与开挖后抗拔桩在竖向上拔荷载作用下的Q–s曲线、桩身轴力以及极限承载力，然后分别利用文献中的数值分析方法和极限平衡简化分析方法建立合理的模型模拟分析离心试验，并将理论方法计算结果和离心模型试验结果进行对比，以此来验证数值分析方法和极限平衡简化分析方法的合理性。Abstract: Determination of the ultimate bearing capacity of an uplift pile under deep excavation has been paid much attention to by more and more geotechnical engineers. The theoretical analysis of this problem becomes a hot research topic recently. Unfortunately, due to the limitation of in-situ test conditions, it is almost impossible to obtain the ultimate uplift capacity of tension piles under deep excavation from field tests. Accordingly, centrifuge model tests on uplift piles under deep excavation are performed to examine the load transfer characters and the ultimate bearing capacity. The variation of displacement, friction resistance and internal axial force of the uplift piles before and after deep excavation is analyzed. And then the centrifugal model tests results are used to verify the rationality of the FEM and the limit equilibrium method. The calculated results by the two theoretical methods have good agreement with the results of centrifugal model tests.
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Keywords:
- uplift pile /
- deep excavation /
- bearing capacity /
- centrifugal model test
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