Deterioration characterization of sandstone physical and mechanical properties under mining and water action.

Comparing the average water absorption rates of Groups B, C, D, and E, the overall average water absorption rate showed an increasing trend with the number of wet and dry cycles, and the average water absorption rate of the mining sandstone with the number of wet and dry cycles in Table 1 was fitted to the relationship Equation (0 ≤ n ≤ 10) as shown in Fig. 4 : 4 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym}

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The pattern of stage degradation and stage average degradation is roughly the same, showing an overall trend of first decreasing and then increasing.

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