(1 同济大学地下建筑与工程系  上海 200092； 2 宝山钢铁股份有限公司  上海 201900)
【提要】在开口管桩的打入过程中，土体进入桩内形成土塞。土塞的形成及其承载力受诸多因素的影响。综合评述不同条件下土塞的稳定理论，并以一个特殊工程为例，根据土塞的一维平衡理论和地下水渗流原理，探讨承压水条件下打桩过程中土塞的形成特点及打桩过后承压水对土塞稳定的影响。理论分析和工程实践均表明承压水能促使土塞涌动，减弱土塞的闭塞作用。
【关键词】  承压水层  管桩  管涌  土塞  稳定
Stability Analysis of Soil Plugs in Pipe Pile Driven in Bearing Aquifer/Xie Yongjian1，Zhu Hehua1，Wang Huaizhong2，Tao Lübing1(1 Department of Geotechnical ngineering,Tongji University,Shanghai 200092,China;2 Baoshan Steel Limited Stock Company,Shanghai 201900,China)
Abstract:During installation of openpipe piles,soil enters the pile until the innersoil cylinder develops sufficiently to prevent further soil intrusion and the pile becomes plugged.”After openpipe piles have driven in bearing aquifer,piping originates in soil plugs under high water pressure.The theory of plugs stability under different condition are discussed.Based on the onedimensional analysis of soil plugs in pipe pile and seepage theory,one especial engineering case is analyzed.For openpipe piles driven in bearing aquifer,the soil plug behavior of pile during driving and the stability of soil plug after finishing driving are discussed.It is shown that soil plugs can take piping and its soil plug effect is weakened when openpipe piles driven in bearing aquifer.
Keywords:bearing aquifer;pipe pile;soil plug;stability