中文摘要：

利用国内最新研制的三堆大型模拟试验台——中国矿业大学（北京）的城市地下工程相似模拟试验系统，进行了3组模型试验，试验研究了群桩与单桩复合地基在应力场、位移场等方面的不同．试验结果表明，群桩复合地基桩土应力比明显高于单桩复合地基；桩侧负摩阻力高于单桩复合地基，桩侧正摩阻力低于单桩复合地基；群桩复合地基沉降高于单桩复合地基；群桩复合地基存在差异沉降．所得结论可为进一步理论研究和工程设计提供有益参考。图12，表3。参10．

英文摘要：

Interaction of pile-soil-pile is an important problem in the theory of composite foundation. Three model experiments were conducted with analog simulation experiment system of urban underground engineering in China University of Mining ＆ Technology, Beijing campus. The differences in stress fields and settlement fields between the single pile composite foundation and pile group composite foundation were studied. Results show that pile-soil stress ratio, pile negative skin friction and settlement in pile group composite foundation are higher than single pile composite foundation, pile positive skin friction is less than single pile composite foundation, differential settlement exists in pile group composite foundation. The conclusions may be useful for further theoretical studies and practical design.12figs., 3tabs., 10refs.