群桩基础地基中的竖向附加应力性状研究

根据我国４幢高层建筑桩基础的共同作用分析成果，对群桩基础中桩的荷载传递特性，桩间土、下卧层土中的竖向附加应力分布特性作了研究。结果表明，群桩的荷载传递特性与单桩不同，群桩基础在下卧层地基中的竖向附加应力分布特性也明显地区别于等代深基础。按本文方法得到的群桩基础地基中的竖向附加应力，用分层总和法计算地基变形，无论是桩间土的变形特性还是桩基沉降量均与现有的实测成果比较一致

Behavior of Applied Vertical Stress in Subsoil of Pile Group Foundations

Based on the results of pile-foundation-interaction analysis for four high rise buildings, a research on pile groups is made to reveal the load transfer of piles and the applied vertical stress distribution in subsoil Analysis results indicate that pile groups are different from a single pile in load transfer behavior, and that pile group foundations are obviously different to equivalent deep foundations in applied vertical stress distribution in substratum The applied vertical stress is used to calculate the deformation of subsoil The results are in agreement with the deformation measured