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Lake thistle emergency drainage project
101A
863187 Results from some oil shale fragmentation experiments conducted at the Amil Points mine. Colorado D~ck. R D In: Rock Mechanic~ in Productirity and Protection f Proceeding* of the Twenty-Fifth Svraposium on Rock .~lechanics, Evanston, Illinois, 25-2" June 1984) Pg.y9-999 Puhl .\'ca }',~rk ..113[E. I9~4 Criteria necessar.', to adequatel.', (ragment off shale v, ere e~aluated by field tests ,.qth simple and complex geometries The effects of stress ~a~es and pres,urisation on fragmentation. crater formation and the effects o( local geology ~ere studied. The tests ~wre instrumented v.~th ~elocit~ gauges and acceleron:eters and the C O R R T E X technique tcontinuous reflectomctry for radius ',ersus tm~c experiments) pro,.~ded reformation to evaluate the performance of the explosi,.e, s{em beha,,iour and crater formation.
863188 Lake Thistle emergency drainage project Essex. R J: Oriard. [. L: Freeman, S T In: Rock ,~lechanics in Productivity and Protection (Proceedings of the Twenty-Fifth Symposium on Rock .$h,chanics, Evanston, Illinois, 25-27 June 1984) P1¢)1¢)-1¢)I-. Puhl .\'ew York .-titlE. 19,'~'-1 \ mudslidc impounded a deep lake ~.hen it blocked the Span,sh Fork ri~er. L:tah. US.-",. To drain the lake and provide a permanent diversion of the ri,.cr, a lo,x le,.el tunnel and a raise bored ,,ertical shaft ,.~ere excavated. The inlet channel exca~a;ion invohed blast:ng a deep. narrow channel in medium grained slightly to highly cemented sandstone. The controlled bh,stmg techniques used and thc ~,upport for the inlet channd ~alls, grouted dottels and chain link wire mesh. are described.
863189 Microcomputer simulation of rock blasting to predict fragmentation Gama, (' D In: Rock .llechanics in Productivi O' and Protection (Proceedings of the Twenty-Fifth Symposium on Rock .$lechanics, Evanston, Illinois, 25-27 June 1984) P 10 I,~-1030. Put~l :Ve. York .'I/HE. 1984 To reduce the complexity of mechanisms influencing rock fragmentation by blasting, a simulation approach is proposed. using the capabilities of microcomputer interactive graphics. Situations involving cratering and bench blasting are simt'lated, and both jointed and intact rocks can be subjected :o cxplosKe action, taking into consideration the breakage mechamsms. Size anal',sis cur,,es relating to rock distribution before and after the blasts are determined and compared ~ith field data.
863190 Prototype sheathed explosive rock-breaker charge for open shooting in flammable atmospheres Mainiero. R J: Ha}. J E In: Rock Mechanics in Productivity and Protection (Proceedings of the Twenty-Fifth Symposium on Rock .~fechanics, Eranston, Illinois. 25-27 June 1984) PIO42-105tL Pt,hl .\'e~ York' .-IIWE. 1984 Ahhough there are occasions ~here it would be ad,.antageous from a safety ,,ie~ point to fire open shots, this is not permitted in underground bituminous coal mines in the USA. A prototype ch~,rge for ,,pen shooting, explosive surrounded by a c
la',er o( damp NaCI and contained m a rubber housing, has been de~cloped for use m flammable atmospheres. Details of gallery testin,, in a s~.,7.ulated gass', mines atmosphere, testing for zoxic fumes and rock breaking te>ts, both abo~c ground ar'.d m-n'ine, are dcsc-lbcd.
Crushing and grinding 863191 Crushing of soil particles Hardin. B O J Geotech Engng Dir ..tSCE i 1 I I . Vin. Oc t 19N5. PII--IIO2 :\ dcrinitam of the de~ree to ~hich the particle> of a soil element are crushed or broken during loading is neccssarx in order to dcri,.c mathematical models o( such bcha~iour and understand the constituti,,e beha~iour of soils. The cxtent of crushing depends on particle shape and size distribution, state o( effective stress, effectivc stress path. ,,oid ratio, hardness and water content. Using data from single mineral soils and rockfill-type matcrials, equations are derixed ~hlch ma'. be used to estimate total breakage for a ,_,ixcn soil under a specified loading.
Machine excavation 863192 Roadheaders open ne,~ horizons at San Manuel Douglas. W Engng 31in J VI,~6. .\~. Aug 1985. P__-_. At the San Manuel mine, Arizona, US:\. con',entional drill and blast methods ~cre originall,, used to dri'.e drifts. Four roadheaders equipped ~ith high pressure. ~ater-assisted cutting heads are now in use. Extensive tests of cutterhead picks. ventilation systems, and ground support systems were conducted to determine methods and uses in the active mining areas. It has been sho~n that the key, to success of an}, highly mechanized mining sxstem is a sound preventi,.e maintenance program. A!thot, gh still experimental, high pressure water assisted cutting should allow the roadheaders to successfully cut the hardest rock.reduce destructive vibration in the machine, and dramatically reduce dust•
863193 Current state of the art of rock cutting and dredging Hignett. H J L'S ,army Corps of Engineers report GL-.~'4-I~. Sept 1984. 69P Dredging requirements are changing from predominantIy excavation of alluvial sands and silts to strongly cohesive clays and rock - an area of dredging with little published information or guidelines for contract preparation. As many' excava. tion problems in tunnelling are interrelated to rock dredging, particularly' in the soft to medium rock range, the possible technology transfer from the tunnelling industry that ma'. assist the growth of technology in the dredging industry is examined. Site in'.estigation, rock cutting, and contracts are considered. It is hoped that reduction in risk and cost ~il[ result. 59 refs.
Avail: National Technical Information Service. 5285 Port Royal Road. Springfield.Virginia 22161 USA
1986 Pergamon Press Ltd. Reproduction not permitted
863187 Results from some oil shale fragmentation experiments conducted at the Amil Points mine. Colorado D~ck. R D In: Rock Mechanic~ in Productirity and Protection f Proceeding* of the Twenty-Fifth Svraposium on Rock .~lechanics, Evanston, Illinois, 25-2" June 1984) Pg.y9-999 Puhl .\'ca }',~rk ..113[E. I9~4 Criteria necessar.', to adequatel.', (ragment off shale v, ere e~aluated by field tests ,.qth simple and complex geometries The effects of stress ~a~es and pres,urisation on fragmentation. crater formation and the effects o( local geology ~ere studied. The tests ~wre instrumented v.~th ~elocit~ gauges and acceleron:eters and the C O R R T E X technique tcontinuous reflectomctry for radius ',ersus tm~c experiments) pro,.~ded reformation to evaluate the performance of the explosi,.e, s{em beha,,iour and crater formation.
863188 Lake Thistle emergency drainage project Essex. R J: Oriard. [. L: Freeman, S T In: Rock ,~lechanics in Productivity and Protection (Proceedings of the Twenty-Fifth Symposium on Rock .$h,chanics, Evanston, Illinois, 25-27 June 1984) P1¢)1¢)-1¢)I-. Puhl .\'ew York .-titlE. 19,'~'-1 \ mudslidc impounded a deep lake ~.hen it blocked the Span,sh Fork ri~er. L:tah. US.-",. To drain the lake and provide a permanent diversion of the ri,.cr, a lo,x le,.el tunnel and a raise bored ,,ertical shaft ,.~ere excavated. The inlet channel exca~a;ion invohed blast:ng a deep. narrow channel in medium grained slightly to highly cemented sandstone. The controlled bh,stmg techniques used and thc ~,upport for the inlet channd ~alls, grouted dottels and chain link wire mesh. are described.
863189 Microcomputer simulation of rock blasting to predict fragmentation Gama, (' D In: Rock .llechanics in Productivi O' and Protection (Proceedings of the Twenty-Fifth Symposium on Rock .$lechanics, Evanston, Illinois, 25-27 June 1984) P 10 I,~-1030. Put~l :Ve. York .'I/HE. 1984 To reduce the complexity of mechanisms influencing rock fragmentation by blasting, a simulation approach is proposed. using the capabilities of microcomputer interactive graphics. Situations involving cratering and bench blasting are simt'lated, and both jointed and intact rocks can be subjected :o cxplosKe action, taking into consideration the breakage mechamsms. Size anal',sis cur,,es relating to rock distribution before and after the blasts are determined and compared ~ith field data.
863190 Prototype sheathed explosive rock-breaker charge for open shooting in flammable atmospheres Mainiero. R J: Ha}. J E In: Rock Mechanics in Productivity and Protection (Proceedings of the Twenty-Fifth Symposium on Rock .~fechanics, Eranston, Illinois. 25-27 June 1984) PIO42-105tL Pt,hl .\'e~ York' .-IIWE. 1984 Ahhough there are occasions ~here it would be ad,.antageous from a safety ,,ie~ point to fire open shots, this is not permitted in underground bituminous coal mines in the USA. A prototype ch~,rge for ,,pen shooting, explosive surrounded by a c
la',er o( damp NaCI and contained m a rubber housing, has been de~cloped for use m flammable atmospheres. Details of gallery testin,, in a s~.,7.ulated gass', mines atmosphere, testing for zoxic fumes and rock breaking te>ts, both abo~c ground ar'.d m-n'ine, are dcsc-lbcd.
Crushing and grinding 863191 Crushing of soil particles Hardin. B O J Geotech Engng Dir ..tSCE i 1 I I . Vin. Oc t 19N5. PII--IIO2 :\ dcrinitam of the de~ree to ~hich the particle> of a soil element are crushed or broken during loading is neccssarx in order to dcri,.c mathematical models o( such bcha~iour and understand the constituti,,e beha~iour of soils. The cxtent of crushing depends on particle shape and size distribution, state o( effective stress, effectivc stress path. ,,oid ratio, hardness and water content. Using data from single mineral soils and rockfill-type matcrials, equations are derixed ~hlch ma'. be used to estimate total breakage for a ,_,ixcn soil under a specified loading.
Machine excavation 863192 Roadheaders open ne,~ horizons at San Manuel Douglas. W Engng 31in J VI,~6. .\~. Aug 1985. P__-_. At the San Manuel mine, Arizona, US:\. con',entional drill and blast methods ~cre originall,, used to dri'.e drifts. Four roadheaders equipped ~ith high pressure. ~ater-assisted cutting heads are now in use. Extensive tests of cutterhead picks. ventilation systems, and ground support systems were conducted to determine methods and uses in the active mining areas. It has been sho~n that the key, to success of an}, highly mechanized mining sxstem is a sound preventi,.e maintenance program. A!thot, gh still experimental, high pressure water assisted cutting should allow the roadheaders to successfully cut the hardest rock.reduce destructive vibration in the machine, and dramatically reduce dust•
863193 Current state of the art of rock cutting and dredging Hignett. H J L'S ,army Corps of Engineers report GL-.~'4-I~. Sept 1984. 69P Dredging requirements are changing from predominantIy excavation of alluvial sands and silts to strongly cohesive clays and rock - an area of dredging with little published information or guidelines for contract preparation. As many' excava. tion problems in tunnelling are interrelated to rock dredging, particularly' in the soft to medium rock range, the possible technology transfer from the tunnelling industry that ma'. assist the growth of technology in the dredging industry is examined. Site in'.estigation, rock cutting, and contracts are considered. It is hoped that reduction in risk and cost ~il[ result. 59 refs.
Avail: National Technical Information Service. 5285 Port Royal Road. Springfield.Virginia 22161 USA
1986 Pergamon Press Ltd. Reproduction not permitted