悬臂排桩支护结构的水平土拱效应及桩间距研究  

Study on horizontal soil arch effect and piles spacing of supporting structure of cantilever piles

作　　者：杨帆 时仓艳 Yang Fan;Shi Cangyan(Bazhong City Survey and Design Consulting Service Department,Bazhong 636600,Sichuan;Civil Engineering College,San Jiang University,Nanjing 210012,Jiangsu)

机构地区：[1]巴中市勘察设计咨询服务部,四川巴中636600 [2]三江学院土木工程学院,江苏南京210012

出　　处：《工程建设》2020年第11期29-33,共5页Engineering Construction

摘　　要：对悬臂桩后土体进行基坑开挖时会产生水平变形,并在桩后形成水平土拱,因此桩间距设计中必须考虑土拱效应。本文在对桩间土拱效应进行分析的基础上,根据土拱的静力平衡条件和土体强度理论,推导出桩间距计算公式,并提出简化计算的方法;通过建立数值模型分析土拱效应的影响因素。结果表明:桩后水平土拱的主要影响范围在桩后2倍桩边长内,土拱效应随着桩间距的增大而更加明显;土体的抗剪强度越高,桩间距越大;当桩距一定时,抗剪强度对土拱荷载分配的影响较小。Horizontal deformation occurs in soil behind cantilever piles during excavation of pit and horizontal soil arch generates after piles.Therefore,arch effect must be considered in the design of piles spacing.On the basis of analysis on soil arch effect between piles,the computation formula of piles spacing is derived according to the static balance condition and soil strength theory,while the simplified method is put forward,and influencing factor is analyzed by establishing numerical computation.The results show that the main influencing area of horizontal soil arch after piles is the area within twice pile side length behind piles,and soil arch effect is more notable with increasing of pile spacing.The pile spacing increases with shear strength of soil.When pile spacing remains constant,the shear strength has minor impacts on load distribution of soil arch.

关 键 词：悬臂桩 桩间距 水平土拱 

分 类 号：TU473.1[建筑科学—结构工程] TU753[建筑科学—土工工程]