小直径钢管桩Q-s曲线的数值模拟与分析

Numerical Simulation and Analysis of Q-s Curve for Small Diameter Steel Pipe Piles

目前小直径钢管桩在工程领域内得到了广泛应用,但是为确定小直径钢管桩竖向承载力,通常需要采用静力荷载试验获取其荷载-沉降曲线作为其判断依据,然而原位试验不仅过程复杂,而且耗时较长,同时需要投入大量的人力和物力。利用理论模型推导获得小直径钢管桩的Q-s曲线,不仅可以省去现场试验的必要性,而且能提高设计和施工的效率。本文结合前人的研究,在桩土接触面单元的建立过程中参考了无厚度Goodman界面单元法,理论推导小直径钢管桩的Q-s曲线,并与实测结果对比分析,证明了该理论方法的适用性,并分析了结果存在误差的原因,鉴于较小的沉降对小直径钢管桩承载力的影响较小,因此工程实践中可以通过理论方法获取Q-s曲线。

Currently,small-diameter steel pipe piles are commonly used in engineering.However,determining their vertical bearing capacity typically requires a static load test to obtain a load-settlement curve for assessment.Unfortunately,in-situ testing is a complex and time-consuming process that demands significant resources.Utilizing the theoretical model to derive the Q-s curve of small diameter steel pipe piles can not only eliminate the need for insitu testing but also enhance the efficiency of design and construction.In this work,the Q-s curve of small diameter steel pipe piles is theoretically deduced by referring to the Goodman interface unit method without thickness in establishing a pile-soil contact surface unit in combination with the previous research.It is also compared and analyzed with the measured results to prove the applicability of the theoretical method and analyze the reasons for the errors in the results.Considering that smaller settlement has less influence on the bearing capacity,the Q-s curve can be obtained by the theoretical method in the engineering practice.