(中铁二十四局江苏工程有限公司， 南京 210046)

［摘要］ 螺杆桩作为一种新式桩体，可以通过其螺纹段增强桩侧摩阻力，已经广泛应用于交通和铁路路基等领域，但现阶段，针对应用于建筑结构中的螺杆桩群桩基础承载特性和适用性的研究有限。采用PLAXIS软件，分别建立了应用于建筑结构的螺杆桩群桩基础和直杆桩群桩基础有限元模型。通过基础竖向荷载-竖向位移曲线、竖向变形分布以及基础周围土体有效剪应力、塑性点分布，对比分析了两类群桩基础的承载特性和承载机理的差异。结果表明，相比直杆桩群桩基础，螺杆桩群桩基础能够更好地发辉基础与地基共同承载作用；相对直杆桩群桩基础，螺杆桩群桩基础可以在节省材料的情况下，提高承载力约15%，减小沉降约10%。 

［关键词］建筑结构；螺杆桩；群桩基础；承载机理；变形特性 

中图分类号：TU473-1 文献标识码：A文章编号：1002-848X(2021)09-0144-05

Research on bearing mechanism and applicability of shaft-screw pile group pile foundation in building structure 

JIN  Shunli 

(Jiangsu Engineering Co., Ltd. of China Railway 24th Bureau Group, Nanjing 210046， China) 

Abstract: Shaft-screw pile is a new kind of pile which can enhance the side friction resistance of the pile through its threaded section，and it has been widely used in the field of transportation and railway subgrade fields. However, at present, the research on the bearing characteristics and applicability of shaft-screw pile group pile foundation in building structure is still very limited. Using PLAXIS software, the finite element models of shaft-screw pile group pile foundation and straight-pole pile group pile foundation applied to the building structure were established respectively. Through the vertical load-vertical displacement curve and the distribution of vertical deformation of the foundation, the effective shear stress and the distribution of plastic points of the soil around the foundation, the differences in the bearing characteristics and bearing mechanism of the two types of pile group foundations were compared and analyzed. The results show that compared with the straight-pole pile group pile foundation, the shaft-screw pile group pile foundation can better exert the joint bearing function of the foundation and the ground. Compared with the straight-pole pile group pile foundation, the shaft-screw pile group pile foundation can improve the bearing capacity while saving materials, the bearing capacity is improved by about 15% and the settlement is reduced by about 10%。 

Keywords:building structure； shaft-screw pile； group pile foundation； bearing mechanism； deformation characteristics

作者简介：金顺利，硕士，高级工程师，Email: zt24jsjin@126.com。