基于虚土桩模型的层状地基群桩沉降研究

发布时间：2018-12-19 14:00

【摘要】：群桩中各基桩之间的加筋与遮帘效应和桩端土体变形是群桩沉降计算中的关键部分,极大地影响计算结果的准确性,然而,目前相关的研究仍显不足。采用剪切位移法原理分析了各基桩之间的加筋与遮帘效应,通过荷载传递法原理推导出层状地基土中各基桩桩底、顶之间的沉降与轴力关系式;基于虚土桩模型,探讨了虚土桩长度的影响因素并给出了定量计算公式,得到了层状地基土中各虚土桩顶、底之间的沉降与轴力关系式;利用基桩与虚土桩的边界条件和平衡关系确定柔度系数矩阵,进而根据不同的承台形式求得群桩沉降。工程案例计算表明,理论计算与实测值吻合较好,该方法具有较高的准确性。其研究结果对群桩沉降计算理论的发展具有一定的补充和推动作用。
[Abstract]:The reinforcement and curtain effect between pile groups and the deformation of soil at the pile end are the key parts of settlement calculation of pile groups, which greatly affect the accuracy of the results. However, the relevant research is still insufficient. The reinforcement and curtain effect between piles are analyzed by the principle of shear displacement method, and the relationship between settlement and axial force of pile bottom and top in layered soil is deduced by the principle of load transfer method. Based on the model of virtual soil pile, the influencing factors of the length of virtual soil pile are discussed, and the quantitative calculation formula is given, and the relationship between settlement and axial force between the top and bottom of each virtual soil pile in layered soil is obtained. The flexibility coefficient matrix is determined by using the boundary condition and equilibrium relation between foundation pile and virtual soil pile, and then the settlement of pile group is obtained according to different pile cap forms. The calculation of engineering case shows that the theoretical calculation is in good agreement with the measured value, and the method has high accuracy. The results of this paper are helpful to the development of pile group settlement calculation theory.
【作者单位】：山东大学岩土与结构工程研究中心;
【基金】：国家自然科学基金项目(No.41572275)~~
【分类号】：TU473.1

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