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Table 1 Mechanical parameters of the strata

From: Deformation mechanisms in a coal mine roadway in extremely swelling soft rock

Name Bulk density (average)/(t/m3) Porosity (%) Compressive strength (average)/MPa Tensile strength (average)/MPa Apparent cohesion (average)/MPa Internal friction angle/(°)
Mudstone/carbon mudstone 1.66–2.14 (2.0) 26.20–54.11 0.12–5.12 (1.71) 0.06–0.39 (0.12) 0.24–0.39 (0.31) 25.16–29.01
Siltstone 2.01–2.65 (2.2) 17.48–27.13 0.64–8.00 (2.26) 0.07–0.61 (0.34) 0.23–0.50 (0.38) 13.70–25.50
Coal 1.16–1.35 (1.3) 25.40–45.72 1.18–9.44 (3.44) 0.35–1.13 (0.56) 0.42–1.02 (0.66) 27.05–32.03