Laserfiche WebLink
SE7Yf HY; 2-15-95 :10=10PM : 0 S M-~ 303 832 8106:# 4/ 6 <br />Attachment 1 <br />Sur <br />rediction System 4.Op <br />face Deformation <br />P 02-16-1995 <br />l1 <br />pg <br />~ <br />meabi~iCy <br />A <br />WC <br />55 <br />FileaN <br />S <br />PR <br />T <br />P <br />SD 08:08:13 <br />4 <br />. <br />\ <br />\ <br />OGR <br />M\ <br />a <br />P <br />H <br />AD <br />Case Description <br />None <br />pp <br />1a <br />DStabilit <br />Pi <br />y <br />r <br />1 <br />d <br />i <br />Average un <br />t we qht of overbur <br />en ... <br />b <br />d <br />th <br />~ 160.00 c <br />~ f) <br />A erage over <br />ep <br />._.......... <br />ur <br />an 455.00 t <br />P liar width ....................... 80.00 ft <br />P llar length .................. .. 80.00 ft <br />Pillar herght ....................... 7.50 ft <br />ng width ..... .............. <br />Openi 20.00 ft <br />n <br />Calculated extraction ratio......... 36.00 g1 <br />In-situ uniax~.al compressive strength of coal .... 900.00 psi) <br />Laboratory uniaxial compressive streng th of co al .... 0.00 psi)) <br />Site of specimen .. ................. ........ ....... 6.00 in) <br />Coal strength factor ................. ........ ....... 0.00 psiRin) <br />Calculated Parameters <br />Safety Factor <br />i. Bieniawski 5.5 <br />2. Holland 4.0 <br />3. Holland - Gaddy 2.5 <br />4. Obert - Duvall 3.9 <br />Deptt} fqr Safety Factor = 1 <br />1. Bie~1lawskl 2504 ft <br />2. Holland 1825 ft <br />~ <br />3. Holland - Gaddy 1154 ft <br />4. Obert - Duvall 1758 ft <br />