半刚性水泥搅拌桩软基加固三维数值模拟

半刚性水泥搅拌桩加固处理的海堤软基沉降计算等问题基本以复合地基法为主。为对比分析复合指标与实体桩计算结果的差异,结合某斜坡式海堤工程实例,以岩土有限元软件PLAXIS 3D作为分析平台,分别采用实体桩及复合指标建立水泥搅拌桩海堤软基加固稳定性分析的空间弹塑性有限元数值模型。结果表明,实体桩模型能够较清晰地模拟出桩间土体的"土拱"效应、桩头平面处桩土间的沉降差,以及水泥搅拌桩对于桩间土体的"约束"作用,更为真实地反映软土地基的位移及应力分布情况。分析成果对类似工程以及半刚性桩加固处理软基的数值模拟计算具有一定的参考意义。

Numerical simulation of semi-rigid cement soil mixing pile for soft soil foundation reinforcement

The settlement calculation of soft foundation under seawall reinforced by semi-rigid piles is mainly based on the composite foundation calculation method.In order to compare the difference between the calculation results of the composite index calculation method and the solid pile method,combined with an engineering example of a sloping seawall,taking the geotechnical finite element software PLAXIS 3D as the analysis platform,we respectively used solid piles and composite indexes to establish the spatial elastoplastic finite element model for the stability analysis of cement mixing piles on the sea embankment soft foundation.The results show that the solid pile model can simulate the soil arch effect,settlement difference between pile and soil in the plane of pile head,and the constraint effect of cement mixing pile on soil between piles,and reflect the displacement and stress distribution of soft soil foundation more truly.The analysis results provide reference for similar engineering and numerical simulation calculation of soft foundation reinforced by semi-rigid piles.