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POWDERHORN COAL COMPANY <br />• ROADSIDE MINE <br />PROTECTIVE PILLAR DESIGN <br />Pi//or heighf, m > G.S~Y. <br />Pi//or ~idfh , p 20~/. <br />Overburden depth, H = /500ff <br />Overburden density, r . /aa /6/cu./1. <br />Ang/e o~'i~tervo/ friction, ~ = 9d.8' <br />Compression strength ofpi//or ribside, ~ = 698psi. <br />Moxrmum rertic%oi//ors/ress, ~ <br />_~6.944x/0-jr,vf~F)Ton~t opsi. <br />-~ /t,Sin <br />Tones- /-sin = X356 <br />6.944 x /0 -j~(i4a)(/500~(4356~ t 698 <br />. 7232,asi. <br />Distance rnto/~i/%r fo eaa~ned Cow, r <br />• Y T~ nf1(Ton,B.i)'~ ~ t F r~B Ton ~f. <br />~.p <br />~ G.5 7232 <br />Y X956(3.356) 'G'' 698x0 <br />Z y= 4.34f1,p=20ff. <br />2 y <p, .'. use /ormu/o forwidepi//ors <br />Load carrying copocily o/,oi/% L <br />L = 0.072 ~ ~pl-PY -~ Y t 33 y ` Tons <br />L = 0.072(1292) f/~)/80l '~.{~Z./7~~ao)/z r7~ t %/z r7) J <br />L : 723,400Tons <br />Tiibutory Areo Laid (TAL~ is the weghf of /he orerbuiden Ib 1he ,tarfoce oclinq oneocfi pi//o~ <br />U~ U~~~ <br />- - - n'butory Areo. <br />so' ~ ~ i ~'`Pi//ors <br />• ~ ~------~ I----._-J <br />/00' <br />