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在深厚软土地基处理中,联合使用透水与不透水桩,既可以加速地基固结,又能较大地提高地基的承载力,具有广泛的应用价值。基于轴对称固结模型,并考虑透水桩的体积压缩,建立了透水与不透水桩组合型复合地基的固结微分方程,利用边界条件和初始条件,得到了外部荷载瞬时施加情况下的地基固结解析解,并将该解与现有解析解进行对比分析,验证其合理性;同时,对桩的扰动效应、井阻效应、压缩模量等影响因素进行了分析,探讨了该复合地基的固结特性。结果表明:不考虑透水桩体积变化将高估组合型复合地基的固结速率;减小透水桩的井阻效应和施工扰动效应,增大置换率及桩体模量,将加快组合型复合地基的固结速率,实际工程中可以从这些方面减少地基的工后沉降。
In deep soft soil foundation treatment, the joint use of permeable and impervious piles can not only accelerate the foundation consolidation, but also greatly improve the bearing capacity of the foundation, which has a wide range of application value. Based on the axisymmetric consolidation model and considering the volumetric compression of permeable pile, the consolidation differential equation of composite foundation with permeable and impervious piles was established. By using the boundary conditions and initial conditions, the foundation consolidation At the same time, the influencing factors such as the disturbance effect, the well resistance effect and the compressive modulus of the pile are analyzed, and the influences of the complex foundation Consolidation properties. The results show that the consolidation rate of composite foundation will be overestimated irrespective of the volume change of permeable pile, the well blocking effect and construction disturbance effect of permeable pile will be overestimated, the replacement ratio and pile modulus will be increased, Consolidation rate, the actual project can reduce the post-construction settlement from these aspects.