淤土地基灌注桩水平承载特性试验及数值计算

Experiment and Numerical Analysis of Lateral Load-Carrying Behaviour of Grouting Piles in Silty Soil Foundation

针对淤土地基灌注桩水平荷载作用下桩体受力特性,通过现场水平承载力破坏性试验,对不同桩长、桩径和桩基上部土体的两个试验区进行对比研究,由现场实测得到的桩体桩身轴力与弯矩分布情况,得知桩径增加和桩基上部土体改善有助于提高水平承载力,但桩径的增加对水平承载力的提高效果更为显著;利用ABAQUS数值计算对水平承载特性进行研究,并与现场试验结果进行对比分析,对比表明:现场实测数据和数值模拟的拟合程度较好,说明有限元在桩基水平承载能力研究方面具有合理性,为进一步利用有限元研究桩体水平承载力提供了一定的理论基础。

According to the mechanical characteristics of grouting piles under the horizontal load in silty soil foundation, the comparative analysis is done on the different pile length, different pile diameter and subsoil in two different test area through the site damage testing of horizontal load. Based on the field measurement data on pile shaft force and moment distribution, the increased pile diameter and the improved subsoil are helpful to improving the horizontal bearing capacity, but the remarkable effect can be got through increasing pile diameter. The lateral load-carrying behaviour is studied by the numerical analysis of ABAQUS, and some comparative analysis with field measurement result have done. It shows that it has better fitting degree between online measured data and numerical analysis, and numerical analysis has rationality on the research of lateral load-carrying behaviour of grouting piles. It provides some theoretical basis for the further research on lateral load-carrying behaviour of grouting piles by numerical analysis.