(1.北京波森特岩土工程有限公司  102218;2.北京金隅嘉业房地产开发有限公司  100078)
［提要］  采用弹塑性力学理论中的圆孔扩张理论和球形扩张理论分析载体桩施工过程中桩身和复合载体的挤土效应，确定塑性区的半径。计算结果表明，在复合载体夯扩桩的施工过程中，影响邻桩施工质量的因素是复合载体的施工，而非桩身的成孔影响。根据球形扩张理论，可以大致预估出施工过程中桩间土的隆起。分析为设计提供了一定的参考，并通过实际工程验证了结果的正确性。
［关键词］  复合载体桩  球性扩张  挤土效应  隆起
Compacting Effect Analysis of Forming Process of Ramcompaction Piles with Composite Bearing Base/Yang Qi'an1,  Du Qiang2(1 Beijing Puissant Geotechnical Engineering Co., Ltd., Beijing 102218,China; 2 Beijing Gem Real Estate Development Co., Ltd.,  Beijing 100078, China)
Abstract:The compacting effect in the forming process of ramcompaction piles with composite bearing base during the construction is analyzed by the expanding theory of circular and sphere with theory of elastic and plastic force.The plastic radius is decided.It is shown that during the construction, the factor effecting the quality of ramcompaction piles with composite bearing base is construction of the composite bearing base,not the construction of the pile shaft. According to the theory of circular and sphere, the heave of the soil during the construction can be calculated.It provides the designer reference, and the theory is tested by a real engineering.
Keywords:ramcompaction piles; composite bearing base; expanding theory of circular; compacting effect; heave of soil