砂土地基桩基础承载性状试验研究

Experiment Research on Bearing Behavior of Piles in Sandy Soil Foundation

通过湘阴湘江大桥两根试桩的静载荷试验,探讨了该地区砂土地基中桩基础承载性状及荷载传递机理,对比分析了同一长径比下,桩长对桩身轴力的传递和桩身侧摩阻力的发挥有较大的影响,I号试桩属纯摩擦桩,II号试桩属端承摩擦桩.在设计荷载一定的情况下,恰当选择桩长桩径使摩阻力的发挥达到最优状态是一个设计时值得考虑的问题.另外采用工程桩作为试桩,难以用静载试验确定桩的极限承载力.图8,参11.

In this article,the bearing behavior and load transfer mechanism of piles in sandy soil foundation are discussed on the basis of the static loading test in XiangYin-XiangJiang bridge,the effect of piles' length on the transfer of axial force and the action of lateral friction resistance are analyzed by comparison with the same proportion of length to diameter.No.1 test pile is purely friction pile, No.2 test pile is end-supporting friction pile.On the condition of certain design load the apt choice of pile length is critical to the optimal situation of exertion of lateral friction resistence.On the other hand,engineering pile which service as test pile can not reach the ultimate bearing capacity.8figs,11refs.