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Table 1 Physical mechanical parameter statistics tables of coal rock

From: Intelligent optimization for support pressure zone algorithm based on fuzzy neural network damage identification

Rock strata Density ρ (kg/m3) Modulus of elasticity E (GPa) Poisson’s ratio ν Cohesion C (Mpa) Friction angle Φ (°)
Coarse sandstone 2600 16.5 0.206 4.5 34
Siltstone 2460 19.5 0.2 2.75 38
Medium sandstone 2650 18 0.21 3.5 35
Mudstone 2461 17.7 0.204 1.2 32
Coal 1380 5.3 0.32 1.25 32
Fine sandstone 2873 28.3 0.235 3.2 42