Advances in Civil Engineering / 2018 / Article / Tab 1

Research Article

Safety Mining Technology of Coal Seams in Weathered Zone Based on Ground J-Type Pregrouting Reinforcement

Table 1

Mechanical properties of coal and rock.

LithologyCohesive force (MPa)Internal friction angle (°)Uniaxial compressive strength (MPa)Elastic modulus (GPa)Poisson’s ratioTensile strength (MPa)

Unconsolidated layers12.8934.7092.1025.350.2015.54
Loading layer 23.1641.3034.519.870.254.93
Soft rock4.5038.530.510.560.283.82
Loading layer 15.3642.5035.2811.450.245.19
13# coal0.4828.67.652.960.300.86
Floor strata7.6940.6045.6815.360.237.85

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