岩溶地区刚性桩复合地基宏观本构模型研究

发布时间：2018-04-22 17:46

本文选题：刚性桩复合地基 + 压板试验　；参考：《建筑结构学报》2015年02期

【摘要】：针对岩溶地区刚性桩复合地基承载力与沉降关系的复杂性,对4类典型地质条件下的44个复合地基现场压板试验数据样本进行数理统计分析,在此基础上提出基于Winkler地基模型的修正二折线和四折线弹簧本构模型。为了得到偏于安全的用于工程设计的复合地基弹簧本构模型,采用共同作用分析方法对一栋典型的高层建筑结构进行多折线参数敏感性分析。分析结果表明:二折线弹簧本构模型比四折线弹簧本构模型得到的筏板内力大,在工程设计中,可采用二折线本构模型;对于二折线弹簧本构模型,承载力特征值对应的沉降越小,筏板的内力越大,综合考虑筏板设计的安全性和经济性,在实际工程中,建议承载力特征值点对应的沉降取10 mm,承载力极限点对应的沉降取40 mm。
[Abstract]:In view of the complexity of the relationship between bearing capacity and settlement of rigid pile composite foundation in karst area, the paper makes mathematical statistical analysis on the data of field compression plate test of 44 composite foundation under four kinds of typical geological conditions. On this basis, a modified two-fold and four-line spring constitutive models based on Winkler foundation model are proposed. In order to obtain a safety constitutive model of composite foundation spring for engineering design, a common action analysis method is used to analyze the sensitivity of a typical high-rise building structure with multiple broken line parameters. The analysis results show that the internal force of raft plate obtained by the constitutive model of two-fold line spring is larger than that of four-fold spring constitutive model, which can be used in engineering design, and the two-fold line spring constitutive model can be used in engineering design. The smaller the settlement corresponding to the eigenvalue of bearing capacity, the greater the internal force of the raft. Considering the safety and economy of the raft design, it is suggested that the settlement corresponding to the eigenvalue of bearing capacity should be 10 mm and the settlement corresponding to the limit point of bearing capacity 40 mm.
【作者单位】：华南理工大学高层建筑结构研究所;华南理工大学亚热带建筑科学国家重点实验室;
【基金】：华南理工大学亚热带建筑科学国家重点实验室自主研究课题(2011ZA05)
【分类号】：TU470

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