Proved the appearance of the efficiency of pile groups and together got thecharacter of the changing of Ux,Uy and Sx by comparing with the four modelsmentioned above.

• 通过单桩-土体模型分别与两桩-土体模型和三桩-土体模型 Ux、Uy、Sx的对比,证明了群桩效应的产生,并得到了群桩 Ux、Uy、Sx的变化特点;