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N <br />0 <br /> <br />RECTANGULAR COLLAPSE <br />~ , n (100 <br />N I N, <br />j __ , ~ oS <br />T F•-P-~"L''i <br /> <br />rWEDGE COL LAP; <br />I <br />AN} <br />T <br />H <br />1 <br />nT <br />T <br />~t, <br />~ ~ i <br />--~~~ L~ <br />N . 2A !OW <br />03 <br />H • 3n loo <br />S <br /> <br />30 <br /> L <br />_ ~ 25 <br />W <br />a W <br /> <br />Q ~ <br />Z <br />J W 20 <br />O ~ <br />LL LL <br />0 <br />= ~ 13 <br />a <br /> <br />W <br />= ~ <br />y 10 <br />-- <br /> Q <br />~ <br />~ w <br /> <br />Q ~ <br />W 5 <br />~ a <br /> <br />%9 • PERCENT SWELL • ~o~o° (100) <br />Vo ORIGINAL VOLUME OF UNBROKEN STRATA <br />Ve • VOLUME OF COLLAPSED ROOF 9E05 <br />Diagram showing notation for calculating <br />maximum height of collapse (H) in <br />relation to geometry of collapse. <br />0 <br />RANGE OF PERCENT <br />SWELL FOR <br />COAL MEASURE 9TRATA <br />f-~ <br />I <br />C~ittr{d mo•Imum nslpnt <br />o} oollo Dss in the min°. <br />i <br />9s~ ~ I <br />i <br />PERCENT SWELL °kS <br />Graph showing variation in maximum <br />height of collapse for different modes <br />of failure and percent swell of rock. <br />(modified from Piggott 8 Eynon, 1977) <br /> <br />r+, <br />~o r~ <br />JW <br />~ G <br />rt <br />• (D <br />a <br />ro <br />0 <br />rt <br />m <br />p <br />~r <br />r~ <br />a <br />r <br />(D <br />N~ <br />W <br />n <br />O <br />M <br />n <br />0 <br />r <br />r <br />w <br />ro <br />n <br />x <br />F/~ <br />ro <br />r~ <br />0 <br />rt <br />rt <br />a+ <br />M <br />.7 <br />0 <br />.a. <br />17 <br />m <br />a <br />r <br />a <br />r <br />r <br />G <br />tY <br />N <br />r~ <br />0. <br />N <br />7 <br />n <br />m <br />.~ <br />a <br />N <br />O <br />G <br />G <br />N <br />rr <br />r <br />J <br />r <br />U) <br />U) <br />m <br />