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<br />' -30- <br />• Figure <br />Passive pressure potential for confined <br />• central core of a pillar <br />f <br />! =r z Passive 6H ~ 1 + Sin 3 Crv' + C <br />d Cl -sin ~, <br />• ~~ r ~ = Angle of internal friction <br />.. ^ <br />- ~ C =Sail cohesion <br />w <br />~ ~ ~ =Overburden (confining) stress <br />r ~ <br />~~ T T <br />/1 <br />r•~ <br />=Stress necessary to push aside soil confined by <br />`= "Cfv " and with cohesion of "C" (Passive resistance <br />- of soil) <br />r: .. <br />L - ~°~ - <br />.. <br />' I~arf`allr CONFINED Y Passive ~ =(i ± 51^_° <br />D~s~ressed C£I3TRAL~ ~ `1 - Sinm)~ { <br />~one5 ~`~ f~ic~~ CORE. ~ =Horizontal (confining) stress <br />~o =Sock mass uniaxial compres- <br />sion strergta <br />' : ~Q' _ :taxia~sa stable vertical pillar stress under conFinsment <br />of "~ " a_nd wi~~ rock mass :usiaxial co7apressicn <br />strengt's " ~ • , <br />