株洲二线船闸深基坑双排桩结构的受力特性

对株洲航电枢纽二线船闸高挡土环境中的双排桩结构变形及内力特征,采用数值计算和工程观测相结合的方法,分析不同桩径、不同开挖深度时结构的变形及受力形态。结果表明:双排桩排距取3倍桩径时,不同开挖深度的前排桩最大位移值呈现二次抛物线形态;前排桩内力呈现单锚板桩的受力特征,后排桩内力呈现悬臂板桩的受力特征;通过设置卸荷板、采用抗剪强度大的材料回填可有效控制结构变形及内力。

Force characteristics of double row piles in deep foundation pit of Zhuzhou second ship lock

About the structural deformation and internal force characteristics of double-row piles in high retaining soil environment,we apply the numerical calculation and engineering observation methods,and analyze the deformation and force patterns of structures at different pile paths and different excavation depths.The results show that the maximum displacement of the front row piles with different excavation depths presents a secondary parabola when the pile spacing is taken 3 times the diameter of the pile.The internal force of the front pile presents the force characteristics of the single anchor board pile and the internal force of the rear pile presents the force characteristics of the cantilever board pile.The deformation and internal force of the structure can be controlled effectively by setting the unloading plate and using the material backfill with high shear strength.