Citation

Ren J, Wang W, Dong M, Gao S. China Saf. Sci. J. 2020; 30(10): 82-89.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.10.012

PMID

unavailable

Abstract

In order to study influence of coal seam mining on buried natural gas pipelines in gas-coal overlap areas, stress and deformation characteristics of pipelines under mining influence were studied by using theoretical analysis and numerical simulation, and a mathematic model for deformation under different mining levels was established. It was obtained that stress state at top of pipelines changed from tension to compression and the other way round for bottom part under vertical stress, while under horizontal stress, both top and bottom parts were subject to tensile stress, and direction of force on left and right sides of inflection point was opposite. The results show that deformation of buried pipelines in subsidence areas can be represented by Gaussian function. And under vertical stress, stress state of top and bottom parts shows reverse symmetry up and down while left-and-right symmetry regarding subsidence center. Entire force state of pipelines is left-and-right symmetrical surrounding subsidence center. © 2020 China Safety Science Journal. All rights reserved.

Language: zh