两个相邻高层建筑桩箱基础的共同作用分析

根据分层地基上相邻刚性基础共同作用的分析方法 ,进一步提出了相邻桩箱基础共同作用的分析方法。计算中可考虑荷载偏心、基础埋深以及建筑物荷载重心高度对桩箱基础倾斜的影响。着重对某工程两个相邻桩箱基础共同作用产生的整体对倾和周围地基土中的竖向附加应力分布特点进行了研究。根据对倾实测结果推算 ,密集群桩的影响范围大致相当于L +rg (L、rg 分别为桩长和群桩基础等效圆面积的半径 ) ;受主楼附加应力扩散作用的影响 ,主楼与裙房之间的沉降差较小。

STUDY ON INTERACTION OF TWO ADJACENT PILE-BOX FOUNDATIONS

The interaction of adjacent pile?box foundations with soil is studied in the paper. It is based on the numerical method to analysis the adjacent rigid foundations on the layered soil. The study is emphasized on the effects of whole inclinations and vertical additional stress distribution on the soil. It can be take account of the influences of load eccentricity, foundation depth, and height of load center to foundation base. A practical example is presented for illustration; it is shown that the influence range of group piles is approximated about the pile length plus the equivalent radius. It is found that the difference of settlements of difference foundations is decreased; it is due to the spread effect of the additional vertical stress of tall buildings.