Study on crack propagation law of overlying strata in the process of small coal pillar mining in inclined extra-thick coal seam.

explored the evolution law of overburden fracture in variable mining height working face of deep buried thick coal seam by using physical similarity simulation experiment, and found that the fracture height showed a trend of “latent-sudden increase-gradual increase-stability” 10 .

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With the increase of height, the surface fracture rate of overburden deformation and collapse shows a decreasing trend, and the change trend shows that the complexity of overburden fracture network decreases gradually from the working face.

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