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Hydrofracturing stress determinations at Darlington, Ontario
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81611g HYDRAULIC FRACTURING STRESS ~ E A ~ S NEAR THE K ~ E E N A W FAULT IN U F F ~ MICHIGAN Kim, K; Smith, C C In: Underground Rock Emglneerlng (Papers to 13th Cap,alan Rock Mechanics Symposium, Toronto, 28-29 May 1980), P2~-30. Publ Montreal: CIMM, 1980 Analyses hydraulic fracturing test results from bcreholes ar~ laboratory data, to explain the in situ stresses present near the Keweer~w fault, Michigan. 816115 SUBTERRANEAN STRESS ENGINEERING EkP~IMENTS Campbell, J R; Colgate, S A; Wheat, B M In: Underground Rock Emglneeri~ (Papers to !3th Canadian Rock Mechanics Symposium, Toronto, 28-29 May 1980), F31-35. ~ubl Montreal : CIMM, 1980 Presents results from an experlmemt to alter in situ rock stress field in an oll shale mine by hydrofracturirg and high pressure In~ec~lon of a thlxotropic gel cement. 816116 EYDROFP~CTURING STRESS DETEEMINATIONS AT DARLINGTON, ONTARIO Haimson, B C; Lee, C F In: Underground Rock Engineering (Papers to 13th Canadian Rock Mechanics Symposium, T~onto, 28-29 ~a~ 1980), ~Z-~O. ~ubl Montreal: CINM, 1980 A series of I0 h~Irofracturing tests were
csrried out in a 303m deep hole to determine the state of stress in the Ordovician limestone bedrock and the granitic gneiss in the Precambrian basement at Darllmgton, Ontario. 816117 EFFECT OF STRESS-HISTORY ON THE D~OPMATION BEHAVIOUR OF UND~RGRODX~D OFENTNGS Kaiser, P K In: Undergrotund Rock Em~neering (Papers to 13th Canadian Rock Mechanics symposium, Toronto, 28-29 May 1980), P133-I~0. Publ Montreal : CINM, 1980 The deformation behavlour of u m d ~ r o u ~ openings in an overstressed rock mass is considereal. Amalytlcal amd material models are used to evaluate the effect of load hiatcry. The results are compared with measurements from the Arlberg Road Tunnel. 816118 DETERMINATION OF IN SIX'J HORIZOE'fAL ROCK STRESS ON BOTH A MINE-WIDE AND DISTRICT-W~DE BASIS Agaplto, J F T; Mitchell, S J; Hardy, M P US Bureau of Mines report OFR 143-80, 1 March 1980, 175P Reports investigations in ccal mines of the Beckley mining district of West Vir~Inla, using the strain relief overcc~Img technique. Avail: NTIS, s~ir~Efield, Va, 22161 USA (PB 81-139735 ) 816119 USE OF ADSORPTION/DESORPTION I ~ IN PREDICTING Ot~Z~RST CONDITIONS Lama, R D CSIRO Division of Applied Geomechanics, report GCM21, Jan 1981, 76P
These studies indicate that ~-dsorptlon amd desarption isotherms can be used to predict an outburst condition. A ne~" index L has been developed~ Further studies are under progress to establish that this index can be used as practlc~-I means of i~dicating ~-n outburst condltion, changes in the structur~_l properties of coal, and an approaching ahezr zone. The index does not require testing on site immediately after extracting a sample. The test is simple, easy to carry out, and the L value for a sample can be calculated in less than 20 minutes. It can easily be adc~ted as a routine method of predicting outburst conditions in mines. Avail: CSIRO Division of Applied Geomechanlcs, PO Box 49, Mount Waverley, Vic 3149, Australia
Surface subsidence and caving See also: 816219 816120 ~ SUBSIDENCE: NORTH EAST LEICESTERSHIRE PROSPECT Publ Nottingham: National Coal Board, 1980 , 50P Describes in general terms the likely effects of subsidence if new mines were worked in the NE Leicestershire coalfield. 816121 GROUND TILT IN RELATION TO SUBSIDE~CE IN LONGWALL MINING Whittaker, B M; Pasamehmetogens A G Int J Rock Mech Min Sci, V18, ~ , Aug 1981, P32!-329 Observations of ground tilt arising from longwall mining subsidence were made using a direct method which involved trials with an electrolevel. The results are cozpered to tilt derived by ~recise levelling ~ by a current ~redlction method. The electrolevel proved to be highly successful in investigating ground tilt chamges and enabled variations not hitherto appreciated to be ex=Jzined. Subsidence amd angle of draw were investigated and the electrolevel was used to determine when a significant change in ground tilt ccmdition occurred owing to the approach of mining subsidence effects towards surface structtu'es. Auth. 816122 PREDICTING SURFACE SUBSIDENCE FUR DAMAGE PREVENTION Peug, S S; Che~g, S L Coal Min Process, VI8, NS, May 1981, I~4-95 Discusses controlling factors in surface subsidence, types of grouni damage, and damage to surface structures. Pre~nts an empirical prediction method to determine the subsidence factor based on data from 7 lom~---ll panels and 8 room and pillar sections. 816123 SAFEGUARDING RIVER FLOOD PLAINS IN THE WESTERN DO,mASS (IN ~USSL~N) Onishchenko, A V; Voronkln, A I Ugol Ukralr~, N3, March 1980, .~26-27 Discusses calculation of the subsidence caused by mining coal from beneath the bed of the Samara River ar~ selection of a zlnlng method to
81611g HYDRAULIC FRACTURING STRESS ~ E A ~ S NEAR THE K ~ E E N A W FAULT IN U F F ~ MICHIGAN Kim, K; Smith, C C In: Underground Rock Emglneerlng (Papers to 13th Cap,alan Rock Mechanics Symposium, Toronto, 28-29 May 1980), P2~-30. Publ Montreal: CIMM, 1980 Analyses hydraulic fracturing test results from bcreholes ar~ laboratory data, to explain the in situ stresses present near the Keweer~w fault, Michigan. 816115 SUBTERRANEAN STRESS ENGINEERING EkP~IMENTS Campbell, J R; Colgate, S A; Wheat, B M In: Underground Rock Emglneeri~ (Papers to !3th Canadian Rock Mechanics Symposium, Toronto, 28-29 May 1980), F31-35. ~ubl Montreal : CIMM, 1980 Presents results from an experlmemt to alter in situ rock stress field in an oll shale mine by hydrofracturirg and high pressure In~ec~lon of a thlxotropic gel cement. 816116 EYDROFP~CTURING STRESS DETEEMINATIONS AT DARLINGTON, ONTARIO Haimson, B C; Lee, C F In: Underground Rock Engineering (Papers to 13th Canadian Rock Mechanics Symposium, T~onto, 28-29 ~a~ 1980), ~Z-~O. ~ubl Montreal: CINM, 1980 A series of I0 h~Irofracturing tests were
csrried out in a 303m deep hole to determine the state of stress in the Ordovician limestone bedrock and the granitic gneiss in the Precambrian basement at Darllmgton, Ontario. 816117 EFFECT OF STRESS-HISTORY ON THE D~OPMATION BEHAVIOUR OF UND~RGRODX~D OFENTNGS Kaiser, P K In: Undergrotund Rock Em~neering (Papers to 13th Canadian Rock Mechanics symposium, Toronto, 28-29 May 1980), P133-I~0. Publ Montreal : CINM, 1980 The deformation behavlour of u m d ~ r o u ~ openings in an overstressed rock mass is considereal. Amalytlcal amd material models are used to evaluate the effect of load hiatcry. The results are compared with measurements from the Arlberg Road Tunnel. 816118 DETERMINATION OF IN SIX'J HORIZOE'fAL ROCK STRESS ON BOTH A MINE-WIDE AND DISTRICT-W~DE BASIS Agaplto, J F T; Mitchell, S J; Hardy, M P US Bureau of Mines report OFR 143-80, 1 March 1980, 175P Reports investigations in ccal mines of the Beckley mining district of West Vir~Inla, using the strain relief overcc~Img technique. Avail: NTIS, s~ir~Efield, Va, 22161 USA (PB 81-139735 ) 816119 USE OF ADSORPTION/DESORPTION I ~ IN PREDICTING Ot~Z~RST CONDITIONS Lama, R D CSIRO Division of Applied Geomechanics, report GCM21, Jan 1981, 76P
These studies indicate that ~-dsorptlon amd desarption isotherms can be used to predict an outburst condition. A ne~" index L has been developed~ Further studies are under progress to establish that this index can be used as practlc~-I means of i~dicating ~-n outburst condltion, changes in the structur~_l properties of coal, and an approaching ahezr zone. The index does not require testing on site immediately after extracting a sample. The test is simple, easy to carry out, and the L value for a sample can be calculated in less than 20 minutes. It can easily be adc~ted as a routine method of predicting outburst conditions in mines. Avail: CSIRO Division of Applied Geomechanlcs, PO Box 49, Mount Waverley, Vic 3149, Australia
Surface subsidence and caving See also: 816219 816120 ~ SUBSIDENCE: NORTH EAST LEICESTERSHIRE PROSPECT Publ Nottingham: National Coal Board, 1980 , 50P Describes in general terms the likely effects of subsidence if new mines were worked in the NE Leicestershire coalfield. 816121 GROUND TILT IN RELATION TO SUBSIDE~CE IN LONGWALL MINING Whittaker, B M; Pasamehmetogens A G Int J Rock Mech Min Sci, V18, ~ , Aug 1981, P32!-329 Observations of ground tilt arising from longwall mining subsidence were made using a direct method which involved trials with an electrolevel. The results are cozpered to tilt derived by ~recise levelling ~ by a current ~redlction method. The electrolevel proved to be highly successful in investigating ground tilt chamges and enabled variations not hitherto appreciated to be ex=Jzined. Subsidence amd angle of draw were investigated and the electrolevel was used to determine when a significant change in ground tilt ccmdition occurred owing to the approach of mining subsidence effects towards surface structtu'es. Auth. 816122 PREDICTING SURFACE SUBSIDENCE FUR DAMAGE PREVENTION Peug, S S; Che~g, S L Coal Min Process, VI8, NS, May 1981, I~4-95 Discusses controlling factors in surface subsidence, types of grouni damage, and damage to surface structures. Pre~nts an empirical prediction method to determine the subsidence factor based on data from 7 lom~---ll panels and 8 room and pillar sections. 816123 SAFEGUARDING RIVER FLOOD PLAINS IN THE WESTERN DO,mASS (IN ~USSL~N) Onishchenko, A V; Voronkln, A I Ugol Ukralr~, N3, March 1980, .~26-27 Discusses calculation of the subsidence caused by mining coal from beneath the bed of the Samara River ar~ selection of a zlnlng method to