复合地基沉降计算传统方法参数取值研究

Study on Parameter's Value of Conventional Method for Composite Foundation Settlement Calculation

针对国家标准《建筑地基基础设计规范》(GB50007-)修编工作中有关复合地基沉降计算问题的讨论,基于郑州地区较完整的高层、小高层住宅楼及河南省体育中心等14栋建筑沉降监测资料,研究了复合地基变形计算中分层总和法模型参数的取值问题.分别采用地基处理规范方法和本文分析方法对刚性基础条件下复合地基工程沉降进行了数值计算,并和实测结果进行了比较分析.研究表明,复合地基的变形计算,可采用规范的"当量模量法"和上下分别计算附加应力系数的应力扩散法,其中的下卧土层沉降变形经验系数,可通过地区沉降数据回归获取,无经验时也可参考建筑地基处理规范.

Combining with the discussion on the settlement calculation of composite foundation in the revision of the Code for Design of Building Foundation（GB50007-）,based on relatively complete settlement monitoring data of 14 buildings,including four high-rise,small high-rise residential building in Zhengzhou,Henan Sports Center and so on,the model parameter’s values of the layer summation-method in the deformation calculation of the composite foundation were studied.Using settlement calculation methods and the analysis method proposed in this paper,the numerical analysis of the settlement of composite foundation with rigid foundation was performed and the comparison between the numerical results and actual deformation data measured was conducted.The results show that the deformation calculation of composite foundation can use the equivalent modulus method（EMM） and the stress diffusion method in which the additional stress coefficient calculated separately.The experiential coefficient for settlement of substratum can regressively obtain from the settlement data of the region or refer to the construction foundation treatment code when no experience can be available.