轴向荷载作用下非均匀地基中单桩及群桩分析

该文发展了一种非均匀地基中单桩及群桩分析方法。该方法将桩身离散成若干圆柱形和圆形单元,相应地也将与桩接触的土体界面离散成同样类型和数量的单元,分别建立桩单元和土体界面单元的应力与位移方程。建立桩身单元的位移应力方程时,采用压缩杆理论;建立土体界面单元方程时,采用层状材料基本解。然后,采用桩和土体界面上位移相容条件建立整体方程,计算垂直荷载作用下单桩及群桩的荷载和位移,并且给出桩-基础滑移的计算方法。最后进行了算例分析。由于采用了层状材料的基本解,该数值方法能处理力学参数沿深度方向任意变化的地基。

ANALYSIS OF AXIALLY LOADED SINGLE PILE AND PILE GROUP IN NON-HOMOGENEOUS SOIL

The method for analyzing a single pile and pile groups in non-homogeneous soil is presented. The pile is discretized into cylinder and circular elements, and the corresponding soil is also discretized into the elements of the same amount and type. The equations of stress and displacements are established for piles and soil, respectively. The beam theory is used to establish the pile equation of stress and displacements, and the fundamental solutions of layered solids are used to establish the pile equation. The global equations for obtaining loads and displacements of pile-foundation interaction are presented by using displacement compatibility. The slipping problem of a pile and foundation is also considered. Finally, three examples of a single pile or pile groups are analyzed to demonstrate this numerical method. Because of using the fundamental solutions of layered elastic solids, the proposed method can be used for analysis of the pile-foundation interaction in non-homogeneous soil.