Size effect on the dynamic response of buried gas pipelines under blasting seismic loads

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (2) : 64-73.

ZHAO Ke1，JIANG Nan1,2，ZHOU Chuanbo1，YAO Yingkang2,3，ZHU Bin1

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Abstract

Based on the dimensional analysis theory and analysis of the physical quantities affected the vibration velocity of buried gas pipeline under the given blasting earthquake, the blasting vibration velocity prediction formula that reflected the pipe size effect was deduced. Combined with the full-scale buried earth graphite cast iron gas pipeline downburst test, the simplified model was established for calculation and verified by the field measured data. Numerical models of different pipe sizes (different pipe diameters, different diameter-thickness ratios) were established with verified models and parameters to study the dynamic response characteristics of buried gas pipelines in consideration of the common pipeline types and embedding conditions in Wuhan. The results show that under the action of blasting seismic wave, the peak particle velocity (PPV) and the peak particle effective stress (PES) of pipeline cross section appear on the burst side. The PPVand PES decrease with the increase of pipe diameter and increase with the increase of pipe diameter-thickness ratio. There is a corresponding relationship between the PPVof the surface and the diameter of pipeline. On the basis of the corresponding relation between surface controlled vibration velocity and pipe diameter, it is proposed that the surface control vibration speeds of common pipeline DN700(nominal diameter 700 mm), DN800, DN900, DN1000 and DN1200 are 9.16 cm/s、8.26cm/s、8.10cm/s、7.95cm/s、7.04cm/s respectively. On the basis of the dimensional analysis, the formula between the peak von-Mises stress of the pipeline and the pipeline size and the allowable diameter-thickness ratio have certain guiding significance for the actual production of the pipeline.

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blasting vibration / gas pipeline / size effect / dimensional analysis / dynamic response

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ZHAO Ke1，JIANG Nan1,2，ZHOU Chuanbo1，YAO Yingkang2,3，ZHU Bin1. Size effect on the dynamic response of buried gas pipelines under blasting seismic loads[J]. Journal of Vibration and Shock, 2022, 41(2): 64-73

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