基于土体塑性与剪胀的复合地基静载数值模拟  

Numerical simulation on static loading test for composite foundation based on plastic and shear dilatation properties of soil

作　　者：谢蒙[1] 李玉伟[1] 吴立彬[1] 刘毅光 

机构地区：[1]中水珠江规划勘测设计有限公司,广东广州510610 [2]中交广州航道局有限公司,广东广州510610

出　　处：《人民长江》2012年第15期47-50,共4页Yangtze River

摘　　要：CFG桩复合地基的承载力计算仍依赖于现场的静载试验以及经验公式等原位测试手段,但原位测试和经验公式均存在局限性,不能真实反映地基的实际承载情况。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问题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了参考。The calculation of bearing capacity of CFG pile composite foundation still depends on the in - situ static load test, so it is a new method to estimate its bearing capacity through numerical analysis. In order to increase the precision of the numeri- cal analysis, the reasonable simulation constitutive model which can well reflect the characteristics of the soil is needed. The Plaxis software is used to simulate the static load test of CFG pile in the marine soft soil, and the Hardening - Soil model which could reflect the plastic and shear dilatation characteristics of soil is used to simulate the soil between piles. By comparing the re- suits of numerical analysis and field static load test, it is revealed that by using this model, the bearing capacity of composite foundation is well reflected, and so is the deformation and reloading characteristics. Those results can provide effective reference for the design and construction of CFG pile composite foundation in soft soil.

关 键 词：承载力 静载 数值分析 复合地基 

分 类 号：TU47[建筑科学—结构工程]