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Mechanisms of soil plug formation of open-ended jacked pipe pile in clay

机译：黏土中开口管桩的土塞形成机理

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摘要

The mechanisms of soil plug formation during the jacking of an open-ended pipe pile into clay is investigated by using Coupled Eulerian-Lagrangian (CEL) method. According to the evolution of soil velocity field, the formation of soil plug is divided into: the upwelling stage, the partially plugged stage and the fully plugged stage. A concave arch is formed below the pile tip when the stress bulb expands from the pile wall to the pile axis. The initial soil plug and the fully soil plug are formed when the vertical stress increment of the soil below the pile tip reaches 6 and 9-10 times undrained shear strength (S-u), respectively. The results show that soil plug is easier to be formed in the pile with smaller diameter. The pipe pile shows a fully plugged mode in the stiff soil overlaying soft soil, while pipe pile shows a partially plugged mode in the soft soil overlaying stiff soil. The soil plug is hard to be formed in inhomogeneous clay due to the higher soil strength of deeper soil. An effective method is proposed to estimate the formation of soil plug with the equation for vertical stress increment of the soil below the pile tip.
机译：采用耦合欧拉-拉格朗日法（CEL）研究了开口管桩顶入粘土过程中土塞形成的机理。根据土壤速度场的演变，土壤堵塞的形成分为上升阶段，部分堵塞阶段和完全堵塞阶段。当应力球从桩壁向桩轴扩展时，在桩尖下方会形成一个凹拱。当桩端下方土壤的垂直应力增量分别达到不排水抗剪强度（S-u）的6倍和9-10倍时，便形成了初始土塞和完全土塞。结果表明，在直径较小的桩中，土塞较易形成。管桩在覆盖软土的硬土中显示完全堵塞的模式，而管桩显示在覆盖硬土的软土中完全堵塞的模式。由于较深土壤的土壤强度较高，因此很难在非均质粘土中形成土塞。提出了一种有效的方法，通过桩端下方土体的垂直应力增量方程来估算土塞的形成。

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  • 来源
    《Computers and Geotechnics》 |2020年第2期|103334.1-103334.13|共13页
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  • 作者单位

    China Univ Petr East China Sch Petr Engn 66 Changjiang West Rd Qingdao Peoples R China;

    Shanghai Jiao Tong Univ Sch Naval Architecture Ocean & Civil Engn State Key Lab Ocean Engn 800 Dongchuan Rd Shanghai 200240 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Soil plug; Pipe pile; Clay; CEL; Incremental filling ratio; Plug length ratio;

    机译：土塞;管桩;粘土;CEL;增量填充率;插头长度比;

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