Laserfiche WebLink
<br /> <br />~urt`ace Deformation Prediction System 4.Op <br />>illar Stability Program <br />"ile Name --) UNTITLED <br />:ase Description <br />None <br />Input Data <br />pillar Stability <br />Average unit weight of overburden ... <br />Average overburden depth ............ <br />Pillar width ........................ <br />Pillar length ....................... <br />Pillar height ....................... <br />Opening width ....................... <br />Average extraction ratio ............ <br />Calculated extraction ratio ......... <br /> <br />160.00 (pcf ) <br />640.00 (ft) <br />80.00 (ft ) <br />BO.00 (ft) <br />6.00 ( ft ) <br />20.00 (ft ) <br />36.00 (%) <br />36.00 (%) <br />OS-14-199 <br />14=17=15 <br />In-situ uniaxial compressive strength of coal ....... 856.00 (psi) <br />Laboratory uniaxial compressive strength of coal .... 3000.00 (psi) <br />Size of specimen .................................... 6.00 (in) <br />Coal strength factor ................................ 7348.47 (psi(in) <br />:alculated Parameters <br />Safety Factor <br />1. Bieniawski 4.2 <br />2. Holland 2.8 <br />3. Holland - Gaddy 2.0 <br />4.-Obert - Duual-1 2.9 <br />Depth for Safety Factor = 1 <br />1. Bieniawski 2682 (ft) <br />2. Holland 1800 (ft) <br />3. Holland - Gaddy 1273 (ft) <br />4. Obert - Duvall 1843 (ft) <br />