论文部分内容阅读
针对超长群桩使用较多而理论研究较少的现状,进行了大型的室内超长群桩模型试验。通过对黏性土中桩距为6d的超长钻孔灌注群桩的室内模型试验和实测数据分析,研究了超长群桩的荷载传递机理和承载力特性。得到了在竖向荷载作用下超长群桩的荷载与沉降关系曲线,桩身压缩量占桩顶沉降的百分比、桩身轴力分布曲线以及桩侧摩阻力分布曲线。研究结果表明:超长群桩属于非刚性摩擦桩,桩顶沉降主要由桩身压缩量引起;极限荷载作用下,桩端阻力接近为零,桩身中下部的侧摩阻力没有充分发挥。这些结论为超长群桩的理论研究、工程设计与施工提供有益参考。
In view of the fact that the long pile group is used more and the theoretical research is scarce, a large-scale indoor long pile group model test has been carried out. Through the indoor model test and measured data analysis of the overlength bored piles in the cohesive soil, the load transfer mechanism and bearing capacity characteristics of the overlength group of piles are studied. The relationship between load and settlement of overlong pile group under vertical load, the percentage of pile body ’s compression due to pile settlement, the axial force distribution curve of pile body and the frictional resistance distribution curve of pile are obtained. The results show that the long pile group is a non-rigid friction pile, and the settlement of pile top is mainly caused by the compression of the pile body. Under the ultimate load, the pile tip resistance approaches zero and the lateral friction of the middle and lower part of the pile body is not fully exerted. These conclusions provide useful reference for the theoretical research, engineering design and construction of long pile group.