（南昌航空大学土木建筑学院， 南昌 330063）

［摘要］对砂土地层墩基础分别开展了竖向荷载和水平荷载作用下的室内模型试验，分析了墩基础的位移、变形特征，探究了砂土地层墩基础在不同荷载作用下的承载性能。结果表明：墩长和墩径的增加均有助于提高单墩竖向和水平承载力，其中，墩径的增大较墩长的增长对单墩竖向承载力的影响更为显著；在水平荷载作用下，墩身弯矩呈两端小、中部大的分布特征，最大墩身弯矩出现在模型墩上部；在竖向荷载加载初期，墩底土压力的分布形状为边缘大、中间小，但当竖向荷载增大至一定程度时，墩底土压力的分布形状趋向于马鞍形。

［关键词］砂土地层；墩基础；承载性能；室内模型试验

中图分类号：TU473-2文献标识码：A文章编号：1002-848X(2021)08-0127-05

Study on bearing capacity of pier foundation in sand stratum based on laboratory model test

LI Kairen, HAN Shangyu, LI Yueming, YU Qiang

(College of Civil Architecture, Nanchang Hangkong University, Nanchang 330063, China)

Abstract:Laboratory model tests under vertical load and horizontal load were carried out on the pier foundation in sand stratum, the displacement and deformation characteristics of the pier foundation were analyzed, and the bearing capacity of the pier foundation in sandy stratum under different loads was explored. The results show that the increase of pier length and diameter is helpful to improve the vertical and horizontal bearing capacity of single pier. Moreover, the effect of pier diameter increase on the vertical bearing capacity of single pier is more significant than that of pier length increase. Under the action of horizontal load, the bending moment of the pier shows the distribution characteristics of small at both ends and large in the middle, and the maximum bending moment of the pier appears in the upper part of the model pier. At the initial stage of vertical load, the distribution shape of pier subsoil pressure is large in the edge and small in the middle, but when the vertical load increases to a certain extent, the distribution shape of pier subsoil pressure tends to saddle-shaped.

Keywords:sand stratum;pier foundation;bearing capacity;laboratory model test

*江西省研究生创新专项资金资助项目（YC2018S380）。

作者简介：李凯仁，硕士，Email: 1587441573@qq.com。