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L~ <br />N <br />O 1/B I/4 HILE <br /> <br />-- ceaocK:MLY41Mr5D <br /> BY K. FLECK a n. PAPP <br /> PoannocFCOrnnletls <br />+.~ sunsTOtlETw <br />lO PREROl1RDEN FALI~E T0I <br />TOP CF RIDER COAL <br />O 5041E MYlERPDUCED <br /> <br />• <br />lO LUUJ 0VEROUf1DEN•WEATI IEFlItIG <br /> EFFECTS OF SHA1F <br /> DMINAGE ~HYDROLOGICALe <br />8 FRAl;TUPE EFFECTS <br />~ Pf1O8ABLE SiT1ESS REUTED TO <br /> SAND UTIR W ROOF 6 TOPO~ <br /> Gf4PHD EFFECTS <br />O DMITUGE_4f01STURE6 <br />SFIME <br />O PROBABLE STRESS <br />REUTED TO <br />TCPOGTUPl1C EFFECTS <br />I RIDER C0AL a.5 W ROOF <br />2 SDERffE NOOlAE4 W <br />///~~~ WMEDIATE HOOF <br />WATER AT BASE OF SEAM <br />1 FRACRRlE EFFECTS <br />S SOME MNER WDUCED <br />O STRESS FROM TOPOGRAPHY <br />MID PFIOBABLY SOME <br />IN STN <br />lO CMfKxKFMURE DUE TO <br /> CHMN TEL NI P.ILIEDW E ROOF <br />O STRE SS ON PILLN1Sa HOOF <br /> DUE TO lOAOPIG PRESSURE <br /> OF SAND UNIT <br />O DMINAGE • r1YDROLOGICAI 6 <br /> FMCTURE EFFECTS <br />O POSSIOLE STRESS OtI SI ULE <br /> REUTED TO 70T'OGTIMIIY <br /> ACID CI W lIlE11IIGI I PI ROOF <br />]O RIDER MPRO%. C RI ROOF <br />O FAULTS A FMCTURE ZWIE <br /> WIRI41O1STURE Orl SI IAIE <br />O SIESSDUE T00PEtl0TK7UtD <br /> PO5510.E <br />lO FAl1LTaFMCTURE ZONE W1111 <br />MOISTURE ON 51 ULE <br />8 CM ROCK FAILURE DUE TO <br />CHArrEL <br />~ DMINAGE ~ FRACTURE a MOIS~ <br />IUTIEEFFECTS <br />O STTIESSFROM <br />tl lMalEL <br />LOADING. <br />TOFOCTVPIN <br />MD OPEN <br />GT1WD <br />Poor Roof Conditions alid i'ossible Cause (ARCO, (987) <br />FIGURE 3.4.A.2 <br /> <br />