砂土中四桶吸力式基础水平及力矩承载力分析

ANALYSIS OF HORIZONTAL AND MOMENT BEARING CAPACITIES OF TETRAPOD BUCKET FOUNDATION IN SANDY SOIL

针对砂土中四桶吸力基础的承载性能,基于有限元软件ABAQUS,建立不同桶间距、桶埋深以及砂土密实度下的四桶基础模型,进而研究不同参数下四桶基础的承载特性和破坏模式。研究发现随着桶间距的增大,四桶基础的水平承载系数先增大后保持不变,而力矩承载系数则一直近似线性增加。桶间距相同时,四桶基础的水平与力矩承载系数均随桶埋深的增大而增大。此外,密实砂中四桶基础的水平承载系数始终要略大于中密砂,而力矩承载系数在不同砂土密实度中的值会受到桶间距的影响。

Aiming at examining the bearing capacity of the tetrapod bucket foundation in sandy soil,different buck-et separation distances,bucket embedment depths,and sand compactness are simulated by ABAQUS software.The bearing coefficient and failure mode of the tetrapod bucket foundation with dfferent parameters are obtained.With the increase of bucket separation distance,the horizontal bearing coefficient of the tetrapod bucket foundation first increases and then remains unchanged,while the moment bearing coefficient has been approximately linearly in-creasing.With the same bucket separation distance,the horizontal and moment bearing coefficients of the tetrapod bucket foundation increase with the increase of bucket embedment depth.In addition,the horizontal bearing coeffi-cient of the tetrapod bucket foundation in dense sand is always slightly larger than that of the medium dense sand,and the value of the moment bearing coefficient in different sand compactness will be affected by the bucket separa-tion distance.