Study on the evolution mechanism of damage to overburden fissures of repetitive mining of close coal seam groups by positive faults.

As the upper seam is mined after the lower seam is mined, the stress distribution of the upper seam is affected by the mining of the lower seam, resulting in an increasing trend in the stress level sustained by the upper seam compared to the stress level of the lower seam under the same mining conditions.

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