Experimental research on compressive strength deterioration of coal seam floor sandstone under the action of acidic mine drainage.

Figure 8 presents the curves depicting the relationship between the compressive strength of the samples and porosity under the action of AMD with pH values of 7.48, 4.81, and 2.62, all displaying a decreasing trend with an increase in porosity.

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For pH values of 7.48, 4.81, and 2.62, respectively, the porosity of the samples demonstrates an increasing trend with an increase in the acidity of AMD and infiltration time.

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