Research on dust and rockburst control technology for coal mining and mathematical correlation.

For instance, when measuring the permeability of the 4# coal sample at 9 MPa injection pressure, the permeability of the 12th cycle was smaller than that of the 9th cycle, indicating a decreasing trend.

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These results indicate that the native microcracks and pores within the sample gradually expand throughout the entire cycle under the influence of alternating hydraulic pressure, resulting in an increasing trend in permeability.

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