摘要
梯级支护前后排桩的桩间土承担前后排桩受力传递,桩间土力学特性影响前后排桩的受力变形。依托软土区逆错层式深基坑工程项目,建立设置水平支撑的梯级支护平面有限元模型,着重探讨前后排桩间土加固截面形式对梯级支护结构的受力变形影响。研究结果表明:软土区桩间土采用水泥土加固,可以较好地将前排桩的内力传递给后排桩;桩间土可以采用阶梯形加固截面,阶梯型加固尺寸存在最优梯高比,计算模型最优梯高比为h_(1)/h_(2)=1.5,当小于该梯高比时,随着梯高比的增大,支护结构的水平位移有明显的减小,当大于该梯高比时,对控制支护结构水平位移意义不大,同时支护结构弯矩与剪力在最优梯高比时达最小值,这对保障基坑安全有重要的意义。
The soil between front and rear pile piles bears the force transmission between front and rear piles,and the mechanical characteristics of soil between piles affect the force deformation of front and rear pile piles.Relying on the reverse wrong layer deep foundation pit project in the soft soil area,the finite element model with horizontal support is established,focusing on discussing the influence of the soil reinforcement section between the front and rear discharge piles on the force deformation of the ladder supporting structure.The research results show that the internal force in the front pile in the soft soil and the optimal ladder height ratio is h_(1)/h_(2)=1.5.When the ladder height ratio is smaller,the minimum is to for the safety of the foundation pit.
作者
徐成皓
周爱兆
侯绍雯
刘刚
胡梦狄
XU Chenghao;ZHOU Aizhao;HOU Shaowen;LIU Gang;HU Mengdi(School of Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S01期2165-2169,共5页
Building Structure
关键词
基坑工程
梯级支护
桩间土加固
foundation pit engineering
ladder support
soil reinforcement between pile
