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SENT BY= ~5-95 ;lO~IOPM ; 0 S~f~ 303 832 8106;# 4/ 6 <br />Attachment 1 <br />Sur11face DeformationogPrrediction System 4.Op 02-16-1995 <br />FileaNameabi~icy`SDPS\PROGRAM\THWC455.PAD 08:08:13 <br />Case Description <br />None <br />Data <br />Stability <br />f <br />f <br />erage unit we}ght o <br />overburden ... <br />b <br />d <br />t 160.00 <br />5 <br />00 ppc <br />) <br />t <br />erage ppver <br />ep <br />h ............ <br />urdan <br />ll <br />dth 4 <br />5. <br />80 <br />00 P <br />ft <br />....................... <br />ar Wi . <br />liar length ....................... 80.00 ft <br />ll~r hei4ht ....................... <br />ening Width ..... .............. 7.50 <br />20.00 ft <br />ft <br />eragge extraction ratio ......... <br />~o~ 31.00 t) <br />......... <br />iculated extraction rat 36.00 t) <br />in-situ uniax~al compressive strength of coal .... 900.00 (psi) <br />Laboratory unlaxial compressive strength of coal .... 0.00 psi <br />size of specimen .. ................................ 6.00 inl <br />Coal strength factor ................................ 0.00 psiain) <br />Calculated Parameters <br />Safety Factor <br />i. Bieniamski 5.5 <br />2. Holland 4.0 <br />3. Holland - Gaddy 2.5 <br />4. Obert - Duvall 3.9 <br />Deptt} for Safety Factor = 1 <br />1. B1e~liawski 2504 ft <br />2. Holland 1825 ft <br />3. Holland - Gaddy 1154 ft <br />4. Obert - Duvall 1758 ft <br />