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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />?OTENTIAL FAILURE SUP.FAC` <br />1 / <br />i) WEAK RO:.C \~ <br />MATERIAL ; \ \ \ <br />~ __ <br />1 <br />,y~ <br />~, <br />/ / `. <br />ii) INTcVSE OR <br />VERY WEAK ROCK MATERIAL <br />FUTURE SURFACE <br />INOE°ENDANT OF JOINTING <br />IN ROCK MASS. <br />INTu~SE JOINTING WITH <br />MANY ORIENTATIONS <br />=AILURE ALONG A 57E?DE'J <br />SURFAC.:, CONTINUOUSLY <br />4LONG JOINT SURFACE. <br />HARD (STRONG ROCK <br />FRAGMENTS) <br />VOIDS OR SOFT (GOUGE) <br />MATRIX <br />WAVY FAILURE SURFACE <br />BETWEEN HARD FRAGMENTS <br />FIGURE I Types of weak rock mcsses <br />FRE?JOM <br />