（同济大学地下建筑与工程系，上海 200092）

［摘要］针对开口钢管桩在成桩过程中形成土塞的闭塞效应，回顾总结了影响土塞性状的因素、土塞的力学分析及评价和土塞机理及分析方法。目前，国内外对于土塞的研究多是针对土塞闭塞效应，从宏观的角度进行定性或半定量的研究，很少对开口管桩沉桩过程中土塞的形成和发展机理进行细观研究，尤其是对土塞机理的定量分析更是处于初级阶段。最后，基于先进的数码摄像可视化跟踪技术和数字信息计算机实时处理技术的应用，提出了土塞效应细观颗粒流(PFC)模拟方法，为开口管桩土塞效应研究提供了一种新思路。

［关键词］开口管桩；土塞；土塞效应；土拱效应；土塞增量填充率

Development and expectation  on soil plug in driving or jacked openended pipe piles

Zhou Jian, Wang Guanying

(Department of Geotechnical Engineering, Tongji University, Shanghai  200092,China)

Abstract:Studies on soil plug in driving or jacked open-ended pipe piles were reviewed and summarized, which include  the influence factors of soil plug characteristic,the mechanics analysis and the evaluation of soil plug,and the mechanism of soil plug and the analysis method for soil plug. At present, studies on soil plug mainly aimed at the studies of qualitative and quasi-quantitative from the point of macro-view, both at home and abroad. There are few study which aimed at the micro-mechanism of soil plug, especially for the quantitative studies of soil plug. Finally, according to the apply of advanced digital photographic video tracing technique and computer real time digital information processing technique, a new method for researching the effect of the soil plug in open-ended pipe pile,the particle flow code in 2-dimension(PFC^2D)simulation of soil plug，is proposed.

Keywords:open-ended pipe pile; soil plug; soil plug effect; soil arching effect;  incremental filling ration

*国家自然科学基金资助(50578122)。