水平荷载作用下输电线路塔基斜桩承载特性数值分析  

Numerical analysis of the bearing behavior of the batter pile of the transmission tower subject to horizontal load

作　　者：樊文甫 许银雀 FAN Wen-fu;XU Yin-que(Xi’an Longi Clean Energy Co.,Ltd.,Xi’an 710017,Shaanxi,China;Shaanxi Construction Engineering Development Group Co.,Ltd.,Xi’an 710077,Shaanxi,China)

机构地区：[1]西安隆基清洁能源有限公司,陕西西安710017 [2]陕西建工发展集团有限公司,陕西西安710077

出　　处：《地基处理》2023年第6期492-497,共6页Journal of Ground Improvement

摘　　要：为研究塔基斜群桩水平承载特性,建立三维有限元模型模拟了水平荷载作用下斜群桩基础的承载性状,分析了不同桩身倾角对斜群桩基础桩顶及桩身水平位移、桩身弯矩的影响,并分析了斜群桩各桩的桩−土接触压力。结果表明:斜群桩的水平承载力要比直群桩的水平承载力大,桩身倾角越大,斜群桩水平承载力越大;随着桩身倾角增大,桩身弯矩及剪力减小;斜群桩基础桩顶下的连梁对于桩身弯矩及剪力值均有影响;斜群桩中各桩桩−土接触压力不仅受桩身倾角影响,还与水平荷载作用方向和斜桩倾斜方向的相对关系有关;前排斜桩浅土层桩前桩−土接触压力最大值随着桩身倾角的增大而增大,且均大于直桩,桩后浅土层桩−土接触压力最大值随着桩身倾角的增大而减小。To investigate the horizontal bearing characteristics of the batter pile group within transmission tower foundation,a three-dimensional finite element model was established to simulate the bearing behavior of the batter pile group under horizontal load.And the influence of different pile inclination angles on the horizontal displacement and bending moment of the batter pile group foundation pile top and pile body was analyzed.Additionally,the pile-soil contact pressure of the batter pile group was analyzed.The findings indicate that batter pile groups possess a higher horizontal bearing capacity compared to groups of straight piles.Furthermore,as the pile inclination angle increases,the horizontal bearing capacity of the batter pile group also increases.Notably,the higher the inclination of the pile body,the lower the bending moment and shear force exerted on the pile.It’s worth noting that the coupling beam under the top of the batter pile group foundation affects the bending moment and shear force.Furthermore,the pile-soil contact pressure for each pile in the batter pile group is influenced not only by the inclination angle of pile body but also by the relative orientation between the direction of the horizontal load and the inclination of the batter pile.Specifically,the maximum contact pressure between the front batter pile and the soil in the shallow soil layer before the pile increases as the inclination angle of pile body increases,surpassing that of straight piles.In contrast,the maximum contact pressure between the pile and the soil in the shallow soil layer behind the pile diminishes with increasing pile inclination angles.

关 键 词：塔基 斜群桩 水平承载特性 桩身倾角 桩土作用 数值分析 

分 类 号：TU473[建筑科学—结构工程]