Application of Miniature FBG-MEMS Pressure Sensor in Penetration Process of Jacked Pile.
Application of Miniature FBG-MEMS Pressure Sensor in Penetration Process of Jacked Pile.
复制标题
微型FBG-MEMS压力传感器在静压桩贯入过程中的应用
DOI：
10.3390/mi11090876
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发表时间：
2020-09-21
期刊：
影响因子：
3.4
通讯作者：
Zhang M
中科院分区：
文献类型：
--
作者：
Liu X;Wang Y;Zhang M
为了研究静压桩在粘性土地基中的贯入机理，通过在模型桩体内安装硅压阻式土压力、孔隙水压力传感器和光纤光栅传感器，获得了桩土界面应力变化规律，确定了静压桩在均质粘性土中的贯入特性。试验结果表明：光纤光栅和硅压阻传感技术能较好地满足粘性土中静压桩特性测试的要求。均质粘性土中静压桩时，桩侧阻力与桩端阻力的比值是变化的。在压桩初期，桩侧阻力比值较小，压桩后期，桩侧阻力比值增大，但桩端阻力比值仍高于桩侧阻力比值。有效应力与总径向应力之比很高，两者随深度的变化规律一致。总径向应力、孔隙水压力和有效径向应力均表现出退化现象，且在同一深度下，退化程度随贯入深度的增加而逐渐减小。超孔隙水压力与上覆岩层重量的比值随深度的增加而减小，最大值为87%。研究成果可为粘性土地基静压桩的工程实践提供参考。
In order to study the penetration mechanism of jacked piles in viscous soil foundation, the stress variation law of the pile–soil interface was obtained by installing silicon piezoresistive earth pressure and pore water pressure sensors, and fiber Bragg grating (FBG) sensors in a model pile body, and the penetration characteristics of jacked piles in homogeneous viscous soil were defined. The test results show that: Fiber Bragg grating and silicon piezoresistive sensing technology can better meet the requirements of testing the characteristics of jacked pile in viscous soil. The ratio of pile lateral resistance to pile end resistance varies when pile is jacked in homogeneous viscous soil. In the early stage of pile jacking, the ratio of pile lateral resistance is small, and in the later stage of pile jacking, the ratio of pile lateral resistance increases, but the ratio of pile end resistance is still higher than that of pile lateral resistance. The ratio of the effective stress to the total radial stress is high, and the variation law of the two is consistent with the depth. The total radial stress, pore water pressure, and effective radial stress all exhibit the degradation phenomenon, and the degradation degree decreases gradually with the increase in penetration depth at the same depth. The ratio of excess pore water pressure to overburden weight decreases with the increase in depth, and the maximum value is 87%. The research results can provide a reference for the engineering practice of jacked pile in viscous soil foundation.
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DOI：
10.3390/s150922692
发表时间：
2015-09-08
期刊：
Sensors (Basel, Switzerland)
影响因子：
--
作者：
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通讯作者：
Huang J
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DOI：
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2017-01-01
影响因子：
6.6
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影响因子：
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DOI：
10.1177/1475921716665563
发表时间：
2017-05-01
影响因子：
6.6
作者：
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通讯作者：
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DOI：
10.1177/1475921716658616
发表时间：
2016-11-01
影响因子：
6.6
作者：
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通讯作者：
Rajan, Ginu