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• •~ <br />C~ <br />TABLE XII <br />PRELIMINARY NOMINAL DESIGN VALUES: PHYSICAL PROPERTIES <br />T <br />T <br />a <br />r <br />n <br />a <br />m <br />9 <br />Z <br />O <br />Z <br />r <br />Upper Lover <br />Wheeler Wheeler Various Rock Types <br />PHYSICAL PROPERTY ROOF COAL INTERBURDEN COAL FLOOR SANDSTONE SILTSTONE CLAYSTONE <br />Uniaxial Compressive Strength,MPa 75 20 60 15 50 70 75 30 <br />Elastic Modulus,GPA 10 2 10 2 7 8 10 7 <br />Internal Friction Angle 55° 45° 50° 40° SS° 50° 55° 45° <br />Cohesion,MPa 12 4 11 3.5 8 10 12 6 <br />Brazilian Tensile Strength,TlPa 4 1.5 3 1 3.5 5 5 2 <br />Flexural Strength,MPa 5 2 4 2 4.5 7 7 3 <br />Bulk Density 2.34 1.28 2.24 1.23 2.56 2.49 2.48 2.40 <br />Porosity,x 5 B 7 6 4 5 4 10 <br />Moiature,x 1 4 2 5 1 1 1 4 <br />Slaking Potential VVH N MH N M N H MR <br />Snelling Potential N N N N N N VVL N <br />Protodyakonov Number N/A 1.20 N/A 1.20 N/A N/A N/A N/A <br />N <br />V <br />