大直径群桩基础承载特性现场试验及数值模拟分析

Field Test and Numerical Simulation Analysis of Bearing Characteristics of Large Diameter Pile Group Foundation

文中利用虚拟仿真方法对基桩、群桩的竖向及水平向的承载特性进行分析。结果表明,随着荷载的增加,桩顶水平位移不断增加,最大水平位移为34.6 mm;当加载量为800 kN时,荷载位移曲线开始出现弯曲趋势,该条件下的桩顶水平位移为10 mm;第一级荷载下的承台中心点竖向位移为5 mm,最大荷载下的承台中心点竖向位移为86 mm;第一级水平荷载下的承台中心点水平位移为3 mm,最大水平荷载下的承台中心点水平位移为38 mm;中心桩的桩顶竖向位移最大为86 mm,角桩的桩顶竖向位移最小为83.5 mm;中心桩的桩顶水平位移最大为38 mm,角桩的桩顶竖向位移最小为35.2 mm。

In this paper,the vertical and horizontal bearing characteristics of foundation pile and pile group are analyzed by virtual simulation method.The results show that the horizontal displacement of pile top increases with the increase of load,and the maximum horizontal displacement is 34.6 mm.When the load is 800 kN,the load displacement curve begins to bend,and the horizontal displacement of pile top is 10 mm under this condition.The vertical displacement of the center point of the cap under the first load is 5 mm,and that under the maximum load is 86 mm.The horizontal displacement of the center point of the cap under the first level of horizontal load is 3 mm,and the horizontal displacement of the center point under the maximum load is 38 mm.The maximum vertical displacement of the center pile is 86 mm,and the minimum vertical displacement of the corner pile is 83.5 mm.The maximum horizontal displacement of the center pile is 38 mm,and the minimum vertical displacement of the corner pile is 35.2 mm.