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为了完善碎石桩复合地基固结理论,通过假设从桩体排出的水量等于流入桩体的水量与桩体体积变化之和以及地基扰动区土体水平渗透系数呈线性变化,并考虑上部荷载逐渐施加,推导了考虑桩体体积变化的碎石桩复合地基超静孔压及固结度解析解。当加载时间趋于零时,本文解可退化为瞬时加载情况下的解;当加载时间及桩径同时趋于零时,本文解可进一步退化为Terzaghi一维固结解,这证明了本文解的正确性。通过与已有解的比较,对地基固结性状进行了分析。结果表明,加载过程对地基固结度影响显著,加载历时越长,固结越慢;在各种条件下,不考虑桩体固结变形时地基固结始终比考虑桩体变形时快,并且其影响随着加载历时变小、桩径比变小、桩土模量比变小、桩土渗透系数变小而逐渐增大,这说明在实际工程固结计算中不考虑桩体固结变形是偏于不安全的。
In order to improve the consolidation theory of gravel pile composite foundation, supposing that the amount of water discharged from the pile body is equal to the sum of the volume of water flowing into the pile body and the volume change of the pile body, and the horizontal permeability coefficient of the soil body disturbance zone, Apply and derive the analytic solution of the excess pore pressure and consolidation degree of the gravel pile composite foundation considering the volume change of the pile body. When the loading time tends to zero, the solution of this paper can degenerate into the solution under transient load. When the loading time and the pile diameter both approach zero, the solution of this paper can be further degenerated into Terzaghi one-dimensional consolidation solution, which proves that the solution Correctness Through the comparison with the existing solutions, the foundation consolidation properties were analyzed. The results show that the loading process has a significant effect on the consolidation of the foundation, the longer the loading time, the slower the consolidation. Under all conditions, the consolidation of the foundation is always faster than the deformation of the pile considering the consolidation of the pile, As the loading duration decreases, the pile-diameter ratio becomes smaller, the ratio of pile-soil modulus becomes smaller, and the permeability coefficient of pile-soil becomes smaller and increases gradually, which shows that the settlement of pile consolidation is not considered in the consolidation calculation of the actual project It is insecure.