Analysis on pore structure characteristics of coal and rock mass based on nuclear magnetic resonance technology and fractal theory
To effectively evaluate and characterize the pore structure of coal and rock mass,based on the nuclear magnetic resonance experiments and fractal theory,the pore structure characteristics and fractal dimension features of coal samples with different metamorphic degrees from different mining areas were studied.The results show that as the metamorphic degree of coal samples deepens,the permeability gradually decreases,and the proportions of micropores and small pores is gradually in-creasing.The pore structure of coal and rock mass exhibits the dual fractal characteristics,with the fractal dimensions of smal-ler pore structures ranging between 1.219 28 and 1.623 59,and those of larger pore structures ranging between 2.876 73 and 2.907 10.The research results can quantitatively characterize the pore structure characteristics of coal and rock mass,which is of great significance for the development and utilization of coal.
nuclear magnetic resonancepore structurefractal theoryporosity