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Reconstruction of three-dimensional micro pore structure of coal and Simulation of its mechanical properties

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Document pages: 9 pages

Abstract: This paper takes the low permeability coal seam in the coalfield of nanbuerze basin, Xinjiang as the research object. Using the methods of statistics and digital image analysis, the pore structure characteristics of coal and rock mass in low permeability coal seam are quantitatively analyzed by scanning electron microscope (SEM). According to the pore structure parameters and distribution function of coal and rock mass, a three-dimensional porous cylinder model with different porosity is established by using FLAC3D software. The numerical simulation of the reconstructed pore model shows that: (1) there is an obvious nonlinear relationship between porosity and compressive strength, which satisfies the negative exponential relationship; (2) Porosity significantly affects the stress distribution; Use incremente of micro porosity, the stress distribution becomes nonuniform; (3) the compressive failures of different models are mainly shear failures, and the shape of fracture section is related to porosity; (4) the variation of seepage coefficient of the pore reconstruction model is consistent with the development of micro cracks. The micro mechanism of the deformation and failure of coal and the interaction of multiphase flow with porosity are revealed, which provides a theoretical reference for the clean development of the low permeability coal seam.

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