Analysis of deformation and mechanical characteristics of buried pipelines in mining subsidence areas

doi:10.16265/j.cnki.issn 1003-3033.2020.10.012

Abstract

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.

Key words: mining subsidence area, buried natural gas pipeline, numerical simulation, force and deformation characteristics, subsidence curve

CLC Number:

X944.4

REN Jiandong, WANG Wen, DONG Miao, GAO Shisong. Analysis of deformation and mechanical characteristics of buried pipelines in mining subsidence areas[J]. China Safety Science Journal, 2020, 30(10): 82-89.

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