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.

中文翻译：

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微型FBG-MEMS压力传感器在压桩穿透过程中的应用。

为了研究顶桩在粘性土基础中的渗透机理，通过在模型中安装硅压阻土压力和孔隙水压力传感器以及光纤布拉格光栅（FBG）传感器，获得了桩-土界面的应力变化规律。定义了桩身，定义了顶桩在均质粘性土中的渗透特性。测试结果表明：光纤布拉格光栅和硅压阻传感技术可以更好地满足测试粘性土中压桩特性的要求。在均质粘性土壤中顶桩时，桩的横向阻力与桩端阻力之比会发生变化。在顶桩的早期，桩的侧向阻力比很小，而在顶桩的后期，桩侧阻力比增大，但桩端阻力比仍比桩侧阻力高。有效应力与总径向应力之比很高，二者的变化规律与深度一致。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，并且在相同深度处，随着穿透深度的增加，退化程度逐渐降低。随深度的增加，多余的孔隙水压力与上覆地层重量之比减小，最大值为87％。研究结果可为黏性地基中顶桩的工程实践提供参考。有效应力与总径向应力之比很高，二者的变化规律与深度一致。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，并且在相同深度处，随着穿透深度的增加，退化程度逐渐降低。随深度的增加，多余的孔隙水压力与上覆地层重量之比减小，最大值为87％。研究成果可为黏性地基中顶桩的工程实践提供参考。有效应力与总径向应力之比很高，二者的变化规律与深度一致。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，并且在相同深度处，随着穿透深度的增加，退化程度逐渐降低。随深度的增加，多余的孔隙水压力与上覆地层重量之比减小，最大值为87％。研究成果可为黏性地基中顶桩的工程实践提供参考。在相同深度下，随着穿透深度的增加，降解程度逐渐降低。随深度的增加，多余的孔隙水压力与上覆地层重量之比减小，最大值为87％。研究结果可为黏性地基中顶桩的工程实践提供参考。在相同深度下，随着穿透深度的增加，降解程度逐渐降低。随深度的增加，多余的孔隙水压力与上覆地层重量之比减小，最大值为87％。研究结果可为黏性地基中顶桩的工程实践提供参考。