不同桩距群桩基础桩端土体附加应力分布研究  

Study on the Distribution of Additional Stress at Pile Tip of Pile Group Foundation with Different Pile Spacing

作　　者：赵统 刘永刚 鲁浩阳 Zhao Tong;Liu Yonggang;Lu Haoyang(Xian Drainage Management Centre,Xi'an,China;High Speed Rail Infrastructure Maintenance Department in Lanzhou of China Railway Lanzhou Bureau Group Co.,Ltd.,Lanzhou,China)

机构地区：[1]西安市排水管理中心,陕西西安 [2]中国铁路兰州局集团公司兰州高铁基础设施段,甘肃兰州

出　　处：《科学技术创新》2025年第4期123-126,共4页Scientific and Technological Innovation

摘　　要：群桩基础桩端土体的附加应力叠加很容易造成桩端土体剪切破坏,为了避免桩端土体附加应力叠加,从桩距与桩端附加应力分布的关系进行分析研究。但由于桩土接触和桩桩作用的复杂性,不同桩距的群桩基础的桩端土体附加应力分布规律很难由公式计算出来。为了得出桩距与桩端附加应力分布的关系,在实际工程试验的基础上,利用大型有限元计算软件ANSYS建立该实际试验工程的计算模型(3D桩距群桩基础)以及增大桩距后的对比计算模型(6D桩距群桩基础),给两个模型加同样的竖向荷载,软件计算得到两种模型桩端土体的附加应力值及空间分布。通过分析对比,得到桩端土体附加应力与桩距的关系:3D桩距群桩桩端应力叠加明显;6D桩距群桩桩端应力无叠加现象。In order to avoid the pile-end soil additional stress superposition,the relationship between pile spacing and pile-end additional stress distribution is analyzed.However,due to the complexity of pile-soil contact and pile action,it is difficult to calculate the additional stress distribution of pile-group foundation with different pile spacing.In order to obtain the relationship between the pile spacing and the distribution of additional stress at the pile tip,based on the actual engineering tests,by using the large-scale finite element software ANSYS,the calculation model of the actual test project(3D Pile Group Foundation)and the comparison calculation model after increasing the pile distance(6D Pile Group Foundation)are established,by adding the same vertical load to the two models,the additional stress values and the spatial distribution of the soil at the pile end of the two models are calculated by the software.Based on the analysis and comparison,the relationship between the additional stress of the soil at the pile end and the pile spacing is obtained.

关 键 词：有限单元法计算 群桩基础 土体附加应力叠加 桩距 ANSYS 

分 类 号：TU473.1[建筑科学—结构工程]