桩长径比对建筑单桩承载性能影响分析

An Analysis of Influence of Length-diameter Ratio of Pile on Bearing Capacity of Single Pile in Building

桩长径比对建筑桩基承载性能影响较明显,结合三明学院新建工科实训大楼项目中4根不同长径比的单桩静载测试数据,应用有限元软件GTS对其进行荷载沉降曲线、桩身轴力和侧摩阻力分析。研究结果表明:工程实测桩顶位移曲线与理论计算曲线拟合较好,能够满足仿真需求;长径比增大,Q-S曲线越趋于缓和,桩身压缩量占总沉降比例也越大,桩身轴力主要衰减在桩身中上部,端阻力所占比重减小,桩侧摩阻力随深度增加发挥程度降低。结论对实际工程桩基长径比设计具有一定的参考价值。

The influence of pile length-to-diameter ratio on the bearing capacity of pile foundation is obvious. This paper combines the static load test data of four different length-diameter ratios in the new engineering training building project of Sanming University, and loads it with finite element software GTS. Settlement curve, pile axial force and side friction analysis. The research results show that the measured displacement curve of the pile top and the theoretical calculation curve fit well, which can meet the simulation demand;the length-diameter ratio increases, the QS curve tends to be moderate,and the pile compression ratio accounts for the total settlement ratio. The axial force is mainly attenuated in the upper part of the pile body, the proportion of the end resistance is reduced, and the side frictional resistance of the pile is reduced with the increase of the depth. The conclusion has certain reference value for the design of the actual engineering pile foundation length to diameter ratio.