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T <br />z <br />(D <br />r <br />r <br />W <br />0 <br />I <br />�o <br />w <br />• <br />RECTANGULAR COLLAPSE <br />K N x 0001 <br />T 1-- P-`t-L^t <br />WEDGE COLLAPSE <br />NI <br />h <br />h <br />H 2000) <br />` oS <br />100) <br />N 3n %S <br />Vc-yo <br />%S x PERCENT SWELL x Vo (100) <br />Vo • ORIGINAL VOLUME OF UNBROKEN ,STRATA <br />Vc x VOLUME OF'COLLAPS'EOROOF REDS <br />Ologrom Showing nolallon for calculoting moxlmun height of <br />collapse (H) In reloliOn 10 goonelr,y of eollopee. <br />(modified from Piggott 6 Eynon, 1977) <br />30 <br />1 X 25 <br />i U <br />= <br />RANGE OF PERCENT <br />X <br />N, <br />SWELL FOR <br />N W <br />COAL MEASURE STRATA <br />0 20 <br />n <br />02 <br />K <br />C < <br />J F <br />c f l <br />i^ Cv O7Sdeved maxtmvmheipht I <br />O <br />0 <br />w <br />of Collopse in tits mine. I <br />N <br />0 <br />n¢ <<9 <br />U. p I S <br />I <br />h7 <br />N <br />CO J <br />W :e 10 <br />< <br />�T <br />S^CL�SR <br />(t <br />r <br />cl <br />N S <br />r <br />w <br />C OLIApSE <br />e <br />W <br />0 <br />30% 40010 500/. <br />: <br />PERCENT SYIEL�. %S <br />(EXPRESSEO ASAPERCENTAGE) <br />Grcph Showing vorlolion In maslmum heiphl Of Collopse <br />for Citferant mcdes of failure and bulking toctors. <br />(modified from Piggott 9 Eynon, 1977) <br />H <br />C) <br />M <br />