Laserfiche WebLink
TEST DATA <br />Somerset Mine Samples <br /> <br />L D L/D ~- Co <br />4.125 4.125 1.000 3970 3790 <br />4.156 4.125 1.002 2690 2690 <br />4.281 4.125 1.038 3500 3529 <br />3.969 4.125 0.962 3140 3113 <br />3.781 4.125 0.917 3740 3666 <br />2.969 4.125 0.720 4540 4179 <br />2.719 4.125 0.659 5880 5275 <br />4.000 6.000 0, 667 2480 2232 <br />3.940 7.560 0.521 1210 1005 <br />4.000 7.560 0.529 3400 2839 <br />Co Avg = 3250 psi coal <br />bearing capacity <br /> <br />~J <br /> <br />Safety Factor = 3250 psi = 3. 64 <br />892. 9 psi <br />There will be no subsidence with a pillar safety factor this large. <br />F-48 <br />Rev. 1:6-18-81 <br />