Attenuation and Time-Frequency Characteristics of Explosion Ground Vibration of Shallow Buried OD1422-X80mm-12 MPa Pipeline Based on Prototype Experiment

AbstractIn this paper, the explosion experiment of OD1422-X80mm-12 MPa natural gas pipeline was carried out to study the vibration hazards. The classic Sodev’s empirical formula was improved to predict the vibration velocity of the gas pipeline explosion. At the same time, the fast Fourier-transform (FFT) was used to analyze the data. It was found that the vibration energy was mainly distributed in the range of 0–100 Hz, and there were several subfrequency centers. The Hilbert–Huang transform (HHT) method was used to decompose the vibration into time-frequency domain. It was shown that the pipeline explosion vibration presented multiple loading modes, and there were extremely low frequency (ELF) components that existed for a long time. The research results laid the foundation for further comprehensive analysis of the hazards of natural gas pipeline explosion, and provided reference for safety design of parallel pipeline and buildings.