竖向拉力作用下桩数量对NT-CEP群桩效应影响的研究  

Study on influence of pile number on NT⁃CEP pile group effect under vertical tension force

作　　者：林圣博 钱永梅[1] 何嫚嫚 贾柏晨 李华强 LIN Shengbo;QIAN Yongmei;HE Manman;JIA Baichen;LI Huaqiang(School of Civil Engineering,Jilin University of Architecture,Changchun 130118,China;East China Architectural Design&Research Institute Co.,Ltd.,Shanghai 200001,China;China Resources Land(Changchun)Co.,Ltd.,Changchun 130022,China)

机构地区：[1]吉林建筑大学土木工程学院,长春130118 [2]华东建筑设计研究院有限公司,上海200001 [3]华润置置地(长春)有限公司,长春130022

出　　处：《建筑结构》2025年第6期138-142,共5页Building Structure

基　　金：国家自然科学基金项目(52078239)。

摘　　要：新型混凝土扩盘群桩(NT-CEP群桩)抗拔承载性能受群桩效应影响显著,不同桩数量的群桩基础抗拔极限承载力受群桩效应的影响程度不同。采用ANSYS有限元软件建立四桩、六桩、九桩三组NT-CEP群桩模型。通过分析桩周土位移、剪应力以及桩身位移,研究桩数量对NT-CEP群桩效应的影响。分析结果表明,桩数量越多的NT-CEP群桩抗拔极限承载力受群桩效应影响越大,且群桩的中心桩抗拔极限承载力衰减最为严重。最后依据NT-CEP单桩抗拔极限承载力计算公式,通过引入抗拔极限承载力修正系数α,提出了NT-CEP群桩抗拔极限承载力计算公式,并给出了α的取值。The uplift bearing performance of the new⁃type concrete expanded⁃plate pile group(NT⁃CEP pile group)is significantly influenced by the pile group effect,with the ultimate uplift bearing capacity of pile groups containing different pile number being affected to varying degrees.Three groups of NT⁃CEP group pile models with four,six,and nine piles were established by using ANSYS finite element software.The influence of pile number on NT⁃CEP group piles effects was investigated through analysis of soil displacement around piles,shear stress and pile body displacement.The analysis reveal that the uplift ultimate bearing capacity of NT⁃CEP group pile with greater number of piles is more affected by the group effect,and the uplift ultimate bearing capacity of the central pile in the pile group is the most severely attenuated.Finally,based on the calculation formula for the uplift ultimate bearing capacity of single NT⁃CEP pile,a calculation formula for the uplift ultimate bearing capacity of NT⁃CEP group pile was proposed by using the uplift ultimate bearing capacity correction coefficientα,and the value ofαwas provided.

关 键 词：新型混凝土扩盘群桩 群桩桩数 抗拔极限承载力 有限元模拟分析 

分 类 号：TU473[建筑科学—结构工程]