基于桩基静载试验的地基附加应力分布规律研究

A study on the distribution pattern of additional stress of foundation based on pile static load test

在桩基静载试验中,荷载通过压重平台支墩支撑于地基,由千斤顶分级转移至试桩,堆置的荷载引起基准桩下地基内部产生附加应力,附加应力的增减引发地基土层的压缩、回弹变形,造成基准桩相对于试桩产生升降位移,对桩基静载试验产生影响。为研究地基变形对静载试验结果的影响程度,本文对压重平台下地基不同位置、不同深度的附加应力量值进行计算,对其分布规律进行分析研究。

In a static load test of pile foundation,the load is supported on the foundation through the buttresses of the pressure platform,and transferred from jack to the test pile in stages.Stacked weights cause additional stress inside the foundation under the reference pegs.The increase and decrease of the additional stress cause the compression and rebound deformation of the foundation soil layer,which causes the up-and-down displacement of the reference pegs relative to the test pile,and affects the static load test of the pile foundation.In order to study the influence of foundation deformation on the results of static load test,in this paper,we calculate the additional stresses at different positions and different depths of the foundation under the pressure platform,and analyze their distribution law.