地面超载条件下土体侧移模式及对邻近桩基影响分析

建立了三维数值模型，进行堆载-弹塑性地基-桩基共同作用有限元数值分析。在地面超载条件下，对自由场土体的侧向位移模式进行了探讨，得出了土体侧向变形规律。在此基础上，对堆载作用下邻近桩基的力学性状进行了分析，包括不同堆载大小、不同堆载距离和不同桩间距等情况下桩基的侧向变形和弯矩的变化规律。分析结果表明：随着堆载的增加，桩基的变形和弯矩都有显著的增长，桩基逐渐弯曲。在同样条件下，增加桩的刚度，桩身弯矩迅速减小，桩身刚度很大时，会发生整体侧移。桩间距和堆载距离对桩身弯矩和变形有重要影响，随着桩间距和堆载距离的增大，桩身的变形和弯矩都将减小。

Soil lateral mode and numerical analysis of pile foundataion subjected to adjacent surcharge loads

3-D finite element method is used to analyze soil’s lateral deformation mode in the free field state in this paper. On the basis of that, lateral deformation and moment variable regularity of adjacent piles due to surcharge loads on the ground is explored, including different loads, loading distances, pile spacings and so on. Analytical results show that, piles’ deformation and moment will increase with the increase in loads, and piles will gradually become curved. If other conditions are the same, pile moment decreases quickly with the increase in piles’ stiffness, when the piles’ stiffness gradually become large, the pile will take on global displacement. Pile spacing and surcharge loads distance have important influence on pile moment and deformation. Pile moment and deformation will diminish with the augment in pile spacing and surcharge load distance.