主裙楼变厚度筏板计算分析

Mathematical Analysis of Variable Thickness Raft Foundation

本文采用三维有限元法的三维退化层合单元法和分区积分技术 ,将桩土看成弹簧作用在筏板上 ,把群桩中单桩非线性刚度和土的刚度结合到总刚度中 ,建立起桩 -土 -筏相互作用简化方法 ,分析了高层建筑主裙楼采用平板式筏板和梁板式筏板相结合基础型式的桩筏基础的沉降和筏板中的应力等分布情况 ,并与实测结果进行了比较 ,结果比较一致。

The paper distributes a method to take into account the piles-raft-soil′s interaction. The pile and soil under the raft are simplified into springs. The stiffness of the pile is calculated from the P-S curve of the single pile. The settlement of substratum is calculated by layer-wise summation method. The settlement in the whole foundation, the stress in the raft, the reaction force on the top of piles are analyzed.