| 黄河冲积平原区静压管桩超静孔隙水压力时空效应试验研究 |
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| 引用本文： | 张思峰,任子夤,郑帅,张弛.黄河冲积平原区静压管桩超静孔隙水压力时空效应试验研究[J].路基工程,2022,0(1):53-57. |
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| 作者姓名： | 张思峰 任子夤 郑帅 张弛 |
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| 作者单位： | 1.山东建筑大学交通工程学院，济南 250000 |
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| 基金项目： | 山东省路桥集团有限公司项目（H19268Z） |
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| 摘 要： | 依托京台高速德州至齐河段改扩建工程管桩处治软土实例，通过在管桩不同深度、不同径向距离处埋设孔隙水压力计，对黄河冲积平原区管桩沉桩过程中引起的超静孔隙水压力的时空效应进行了研究。结果表明:管桩沉桩过程中产生的超静孔隙水压力是影响桩基承载力的重要因素。超静孔隙水压力的消散率随深度增加呈线性减小规律，随水平距离增加呈指数形式衰减规律，其有效影响范围约为9倍桩径；超静孔隙水压力的上升主要体现在桩体贯入的中前期，后期随沉桩速率减小到3 m/min时基本保持稳定。
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| 关 键 词： | 黄河冲积平原区 静压管桩 超静孔隙水压力 时空效应 消散率 沉桩速率 |
| 收稿时间： | 2021-08-06 |
Experimental Study on Space-time Effect of Excess Pore Water Pressure of Static Pressure Pipe Pile in the Alluvial Plain of the Yellow River |
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| Abstract: | In relation to the example of soft soil treatment of pipe pile in the reconstruction and expansion project of Dezhou—Qihe section of Beijing—Taiwan highway, the space-time effect of excess pore water pressure in the alluvial plain of the yellow river caused by pile driving is studied by embedding pore water pressure gauge at different depth and radial distance of pipe pile. The results show that the excess pore water pressure in pipe pile driving is an important factor affecting the bearing capacity of pile. The dissipation rate of the excess pore water pressure decreases linearly with the increase of depth, and decreases exponentially with the increase of the horizontal distance, and the effective influence range is about 9 times of the pile diameter; The rise of the excess pore water pressure mainly reflected in the middle and early stage of pile penetration, and the later stage showed a stable state when the pile driving rate is reduced to about 3 m/min. |
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