均质黏性土中静压沉桩桩土界面孔压增量及有效土压室内试验研究
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1.青岛理工大学 土木工程学院;2.华东建筑设计研究院有限公司 上海地下空间与工程设计研究院;3.同济大学 地下建筑与工程系

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TU 473

基金项目:

国家自然科学基金资助项目(No. 51778312, No. 41772318);山东省重点研发计划(No. 2017GSF16107 , No. 2018GSF117010);山东省自然科学(No. ZR2016EEP06)。


Experimental Test Study on increasing of pore pressure and effective radial stress of Pile-soil Interface During Jacked Pile-sinking in Clayey Soil
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Affiliation:

1.School of Civil Engineering,Qingdao Technological University;2.Shanghai Underground Space Engineering Design Research Institute,East China Architecture Design Research Institute Co,Ltd;3.Department of Geotechnical Engineering,Tongji University

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    摘要:

    研究饱和黏性土中静压沉桩引起的桩土界面孔压增量及有效径向应力的变化规律,对工程实践具有重要意义。利用自制的大比例模型试验系统,通过双壁开口和闭口管桩,实现了开口和闭口桩桩身表面嵌入式安装微型测试元件,得到了考虑孔压增量的桩土界面有效径向应力的变化规律。研究结果表明:入土深度越大,桩土界面孔压增量及有效径向应力越大,闭口桩桩土界面超孔压大于开口桩;桩身上部桩土界面超孔压和有效径向应力小于桩身下部;同一入土深度,随着桩身h/L的增加,桩土界面土压力存在“侧压力退化”的现象;本文特定试验条件下,闭口和开口桩桩土界面超孔压与上覆有效土体自重比值最大值分别是61.2%和52.1%,桩土界面有效径向应力是超孔压的3.76~5.46倍。因此,桩土界面超孔压和有效径向应力与桩身h/L位置有关,试验结果可供静压桩施工和承载力确定提供参考。

    Abstract:

    It’s important to study the variation of pore water increment and effective radial stress of pile-soil interface for jacked-in pile during pile jacking in saturated clayey soil for engineering practice. Embedded installation on open and closed pile body surface of micro earth pressure and pore water pressure sensors was realized. Then the effective radial stress of the pile-soil interface considering the increase of pore pressure is obtained successfully by using the large proportion model test system and double-walled open and closed model pipe pile. The results show that the excess pore water pressure and effective radial stress of pile-soil interface increase with the increasing of embedded depth. The excess pore water pressure of pile-soil interface of closed pile is greater than open pile. The excess pore water pressure and effective radial stress of upper part of pile is less than lower part of pile. The “lateral pressure degradation” presents with the embedded depth increasing at the same penetration depth. The maximal ratio of excess pore water pressure of pile-soil interface and effective pressure of superimposed soil of open and closed pile is respectively 61.2% and 52.1%. The effective radial stress of pile-soil interface is 3.76~5.46 times than excess pore water pressure. So the change of excess pore water pressure and effective earth pressure of pile-soil interface is influenced by variation of pile locations of h/L at different penetration depths. This experimental research is useful for jacked pile construction and bearing capacity design.

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  • 收稿日期:2022-04-06
  • 最后修改日期:2022-05-20
  • 录用日期:2022-06-22
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