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CFG桩复合地基的承载力计算仍依赖于现场的静载试验等原位测试手段,通过数值分析预估其承载力成为新途径之一,而提高数值分析精度的重点就是采用能够合理模拟土体特性的本构模型。运用Plaxis软件对海积软土上CFG桩静载试验进行数值分析,并采用能够有效反映土体塑性与剪胀性的Hardening-Soil模型来模拟桩间土。将数值分析结果与现场静载试验的结果对比发现,采用该模型能够很好地反映复合地基的承载力,同时也较好地反映了CFG桩的变形和再加载特性,为软土区CFG桩复合地基的设计施工提供有效参考。
CFG pile composite foundation bearing capacity calculation is still dependent on the scene of static load test and other in situ testing methods, numerical analysis to predict the bearing capacity as one of the new ways to improve the numerical accuracy of the analysis is to use reasonable to simulate the soil Constitutive model of properties. Plaxis software was used to analyze the static load of CFG pile on soft soil. The Hardening-Soil model which can effectively reflect the plasticity and dilatancy of soil was used to simulate the inter-pile soil. Comparing the result of numerical analysis with the result of on-site static load test, it is found that the model can well reflect the bearing capacity of composite foundation and also better reflect the deformation and reloading characteristics of CFG pile. Design and construction of composite foundation provide effective reference.