- 摘 要
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(中鐵二十四局江蘇工程有限公司， 南京 210046)
［摘要］ 螺桿樁作為一種新式樁體，可以通過其螺紋段增強樁側(cè)摩阻力，已經(jīng)廣泛應(yīng)用于交通和鐵路路基等領(lǐng)域，但現(xiàn)階段，針對應(yīng)用于建筑結(jié)構(gòu)中的螺桿樁群樁基礎(chǔ)承載特性和適用性的研究有限。采用PLAXIS軟件，分別建立了應(yīng)用于建筑結(jié)構(gòu)的螺桿樁群樁基礎(chǔ)和直桿樁群樁基礎(chǔ)有限元模型。通過基礎(chǔ)豎向荷載-豎向位移曲線、豎向變形分布以及基礎(chǔ)周圍土體有效剪應(yīng)力、塑性點分布，對比分析了兩類群樁基礎(chǔ)的承載特性和承載機理的差異。結(jié)果表明，相比直桿樁群樁基礎(chǔ)，螺桿樁群樁基礎(chǔ)能夠更好地發(fā)輝基礎(chǔ)與地基共同承載作用；相對直桿樁群樁基礎(chǔ)，螺桿樁群樁基礎(chǔ)可以在節(jié)省材料的情況下，提高承載力約15%，減小沉降約10%。
［關(guān)鍵詞］建筑結(jié)構(gòu)；螺桿樁；群樁基礎(chǔ)；承載機理；變形特性
中圖分類號：TU473-1 文獻(xiàn)標(biāo)識碼：A文章編號：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
作者簡介：金順利，碩士，高級工程師，Email: zt24jsjin@126.com。
