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(1 同濟(jì)大學(xué)地下建筑與工程系  上海 200092； 2 寶山鋼鐵股份有限公司  上海 201900)
【提要】在開(kāi)口管樁的打入過(guò)程中，土體進(jìn)入樁內(nèi)形成土塞。土塞的形成及其承載力受諸多因素的影響。綜合評(píng)述不同條件下土塞的穩(wěn)定理論，并以一個(gè)特殊工程為例，根據(jù)土塞的一維平衡理論和地下水滲流原理，探討承壓水條件下打樁過(guò)程中土塞的形成特點(diǎn)及打樁過(guò)后承壓水對(duì)土塞穩(wěn)定的影響。理論分析和工程實(shí)踐均表明承壓水能促使土塞涌動(dòng)，減弱土塞的閉塞作用。
【關(guān)鍵詞】  承壓水層  管樁  管涌  土塞  穩(wěn)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