考虑群桩加筋效应的桩基沉降计算方法研究

发布时间：2018-06-30 08:23

本文选题：群桩沉降 + Poulos弹性理论法　；参考：《建筑结构学报》2016年06期

【摘要】：基于弹性半空间的Mindlin位移解的数值积分,结合叠加原理的Poulos弹性理论方法,对群桩进行沉降分析,但在工程应用中,对大型群桩的沉降结果偏大。为了得到合理的桩基沉降值,提出了三桩模型方法,该模型考虑了群桩加筋效应。为了进一步提高群桩加筋效应的计算效率,提出了加筋系数的概念,并推导了群桩加筋系数的矩阵表达式,进而提出了考虑遮拦-群桩加筋效应的群桩加筋系数分析法,并进行了相关的算例分析。结果表明:分析小型群桩沉降时,文中方法与Poulos法和Butterfield的边界元解结果均吻合较好;分析上海中心大厦的大型群桩沉降时,与Poulos法相比文中方法更接近实测值。
[Abstract]:Based on the numerical integration of Mindlin displacement solution in elastic half-space and the Poulos elastic theory method based on superposition principle, the settlement of pile group is analyzed. However, in engineering application, the settlement of large pile group is larger. In order to obtain a reasonable settlement value of pile foundation, a three-pile model method is proposed, which considers the reinforcement effect of pile group. In order to further improve the calculation efficiency of reinforcement effect of pile group, the concept of reinforcement coefficient is put forward, the matrix expression of reinforcement coefficient of pile group is derived, and the analysis method of reinforcement coefficient of pile group considering the effect of blocking and reinforcement of pile group is put forward. An example is given. The results show that the proposed method is in good agreement with the results of the Poulos method and Butterfield's boundary element solution, and the method is closer to the measured value when analyzing the settlement of large pile groups in Shanghai Central Mansion compared with the Poulos method.
【作者单位】：同济大学地下建筑与工程系;华东建筑设计研究院有限公司地下空间与工程设计研究院;
【基金】：“十二五”国家科技支撑计划(2012BAJ01B00) 国家自然科学基金项目(51508522)
【分类号】：TU473.1;TU433

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