盾构开挖不同特性围岩振动特征分析

打开文本图片集

中图分类号：TU443 文献标识码：A

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， considering 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 185Hz ， 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.

Key words： shield construction; vibration response; HHT transformation; EMD decomposition

在盾构掘进过程中，盾构机对岩土层的掘进工作会在地层中产生剧烈振动，这种振动会对隧道周围岩土体产生影响。（剩余8120字）