盾构开挖不同特性围岩振动特征分析
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TU443

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国家自然科学基金资助项目(51874118)


Analysis of Vibration Characteristics of Surrounding Rock with Varied Properties During Shield Tunnel Excavation
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    摘要:

    为深入了解盾构掘进振动对不同地层的影响,选择盾构机在软岩地层、中硬岩地层、硬岩地层掘进的典型工况进行现场振动信号监测。在对振动信号进行分析时,针对盾构施工中振动信号瞬时非平稳性的特点,结合希尔伯特黄变换分析法的自适应优势,运用经验模态分解方法(EMD)深入分析了3种地层的测点振动信号。分析结果显示:盾构施工在三种岩层的振动信号频率主要集中在0~185 Hz范围内,且信号EMD分量中,本征模态函数中2~4频段成分占据主导地位,涵盖了信号的绝大部分能量,盾构掘进过程中各地层瞬时能量主要范围和主要振动频带近似,随着地层类型从软岩逐渐过渡到硬岩,地层的剪切波速逐渐增大,地层振动的瞬时能量峰值也逐渐变大,3个地层中硬岩地层能量最大,中硬岩地层能量次之,软岩地层能量最小。

    Abstract:

    To gain a deeper understanding of the influence of shield tunneling vibration on different strata, on-site vibration signal monitoring was conducted under typical working conditions of shield machines in soft strata, strata with soft upper and hard lower layers, and medium-hard sandstone strata, taking a certain shield construction project as an example. When analyzing the vibration signals, consi-dering the instantaneous non-stationarity of the vibration signals during shield construction and the adaptive advantages of the Hilbert-Huang Transform analysis method, the Empirical Mode Decomposition (EMD) method was used to deeply analyze the vibration signals at the measurement points in the three strata. The analysis results show that the vibration signal frequencies of shield construction in the three rock strata mainly concentrate in the range of 0 to 185 Hz, and in the EMD components of the signals, the Intrinsic Mode Function (IMF) 2 to 4 frequency band components dominate, covering the majority of the signal energy. During the shield tunneling process, the instantaneous energy range and the main vibration frequency band of each stratum are approximately the same. As the stratum type gradually changes from soft rock to hard rock, the shear wave velocity of the stratum gradually increases, and the peak value of the instantaneous energy of the stratum vibration also gradually increases. Among the three strata, the hard rock stratum has the largest energy, the medium-hard rock stratum has the second largest energy, and the soft soil stratum has the smallest energy.

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金杨文润,刘长春,张鸿,刘军,徐泽全,甄梦阳.盾构开挖不同特性围岩振动特征分析[J].河北工程大学自然版,2025,42(2):53-59,66

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  • 收稿日期:2024-06-18
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  • 在线发布日期: 2025-05-15
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