考虑径竖向渗流的刚性桩复合地基固结解析解

Analytical Solutions for Rigid-pile Composite Foundation in Consideration of Radial and Vertical

为评估桩土压缩模量比和置换率对刚性桩复合地基固结的影响,以砂井轴对称固结模型为基础,采用Fourier正弦级数和分离变量法,并且考虑扰动区压缩和附加应力沿深度任意分布,推导了径竖向同时固结条件下复合地基孔压和固结度完整表达式,分析了桩土压缩模量比和置换率对地基固结的影响,计算结果表明,固结速率随着桩土压缩模量比和置换率增大而加快,当桩体强度较高时,其对固结影响并不明显;复合地基固结以竖向为主。

In order to assess the effects of pile-soil compression modulus ratio and transfer ratio on the consolidation of rigid-pile composite ground, and based on the model of axisymmetric consolidation of sand-drains, the Fourier sine series method and separated variation method are adopted to deduce the explicit expressions of excess pore water pressure and consolidation degree for composite ground, and analyze the influences of pile-soil compression modulusratio and transfer ratio on ground consolidation. The calculation results show that the ground consolidation gets faster with the increase of pile-soil compression modulus ratio and transfer ratio, but it has less influence on the consolidation when the pile strength gets larger; Meanwhile, the composite ground consolidation is predominated by vertical consolidation.