刚性桩复合地基渗流固结性能分析

发布时间：2018-05-17 18:55

  本文选题：刚性桩复合地基 + 褥垫层　； 参考：《建筑结构学报》2014年03期

【摘要】：基于饱和砂井渗流固结理论,推导了综合考虑褥垫层、桩、土模量的刚性桩复合地基渗流固结解析解。在ABAQUS中使用Modified Cam-clay模型和孔压单元模拟桩间土体,建立单桩复合地基有限元分析模型。计算结果与某高层结构刚性桩复合地基静载试验吻合较好,验证分析模型的有效性。使用该分析模型,研究褥垫层厚度、模量,桩长对刚性桩复合地基受力及固结变形的影响。结果表明:刚性桩复合地基固结速度远大于天然地基,固结速度随褥垫层模量增大而增大,随井径比减小而增大;结构施工过程中,地基固结沉降已基本完成;褥垫层模量的增大可减小刚性桩复合地基固结沉降,但褥垫层厚度及排水土层厚度的增加都会加大固结沉降。
[Abstract]:Based on the seepage consolidation theory of saturated sand wells, an analytical solution for seepage consolidation of rigid pile composite foundation considering cushion, pile and soil modulus is derived. In ABAQUS, Modified Cam-clay model and pore pressure element are used to simulate the soil between piles, and the finite element analysis model of single pile composite foundation is established. The calculated results are in good agreement with the static load test of a rigid pile composite foundation of a high-rise structure, which verifies the validity of the analytical model. The effects of cushion thickness, modulus and pile length on the stress and consolidation deformation of rigid pile composite foundation are studied by using the analytical model. The results show that the consolidation speed of rigid pile composite foundation is much faster than that of natural foundation, and the consolidation velocity increases with the increase of cushion modulus and decreases with the decrease of shaft diameter ratio, and the consolidation settlement of foundation is basically completed during the construction of structure. The increase of cushion modulus can reduce the consolidation settlement of rigid pile composite foundation, but the increase of cushion thickness and drainage soil layer thickness will increase the consolidation settlement.
【作者单位】： 华南理工大学亚热带建筑科学国家重点实验室;科，

本文编号：1902478