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Simple new blast vibration predictor (based on wave propagation laws)
74A
842302 Earth dam characteristics from full-scale vibrations
Drilling
Gazetas. G, Abdel-Ghaffar, A M Proc lOth International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 June 1981 V3, P207-210 Publ Rotterdam A A Balkema, 1981
See 842309
Comprehenswe full-scale tests mvolvmg earthquake, ambient and forced vtbratlons of numerous earth/rockfill dams from three countries are systemattcally evaluated Valuable mformat~on is obtained regarding the vanabdtty of key material properttes within a dam and thetr variation wtth mtenstty level and type of exotatlon Major charactensUcs of the response to various forces are ldenttfied and new rehable analytical models are thereby developed to assess the vtbrattonal behavlour of embankment dams m lateral and longatudmal &rectlons Auth
842303 Foundation rocking under earthquake loading Taylor, P W, Bartlett, P E, Wtessmg, P R Proc 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 Jane 1981 V3, P313-322 Publ Rotterdam A A Balkema, 1981 A s~mple theory ~s developed for the moment-rotatton behavtour of a ngld footmg under constant vertical load on a Wmkler-type foundation, extended to include uphft and yteld Laboratory tests on model footings on clay and on sand are reported which support the general theoreucal pre&cttons The moment-rotatton relauonshtp is found to be non-hnear as a result of the hftmg of one edge of the footing, even when the foundation material behaves elasucally At rocking amphtudes large enough to cause yleldmg beneath one edge, a strongly nonhnear moment rotation relatlonshtp is formed, wtth hystereuc damping The research shows that rotational yteid may occur under spread footings when earthquake loadmgs are apphed, w~thout serious detriment to vertical Ioad-beanng capacRy, and that, under statable condmons, verucal &splacement, even after several cycles of rocking, can be small
842304 Evaluation of earthquake-indnced permanent displacements for rock slopes Lln, J S
Proc 24th US Symposium on Rock Mechanics, College Station, Texas, 20-23 June 1983 P187-192 Publ AEG, 1983
Comminution of Rocks 8423O5 Comparison of efftciency of mechanical and explosive comminution Lundqmst, R G, Konya, C J Proc 24th US Symposium on Rock Mechanics, College Station, Texas, 20-23 June 1983 P181-186 Publ AEG, 1983 Energy effioency of blastmg and jaw crushmg was measured on the laboratory scale for a sand-cement mortar material It was determined that optlmtzed blasting uuhzes energy m producmg new surface area about 1700 umes as efficiently as crushing on a comparable scale On an energy cost basis blasting ts from 57 to over 700 Umes as efficient dependmg on the partacular explostve selected For some operattons tt may be econormcal to replace most or even all pnmary crushing with mcreased explosive fragmentation. Auth
Blasting 842306 Using geophysical logs in highwall blast design Hagan, T N, Gibson, I M int Assoc Engng Geol Bull N26-27, Dec 1982-June 1983, P77-81 (Paper to the Internattonal Symposmm on Sod and Rock Investlgatwns by In Sttu Testing, Paris, 18-20 Ma) 1983 ) Some, denstty, natural gamma and cahper logs are useful tools for increasing the cost-effecuveness of overburden blasts m surface coal mmmg Such logs give the blastmg engmeer a greater abfltty to opUmlze the &ameter and depth of blastholes, burden d~stance, blasthole spacmg, and the lengths of both backfill and stemmmg
8423O7 Performance monitoring of production blasthole drills - a means of increasing blasting effw.iency Hagan, T N, Retd. I W Trans Inst Min Metall (Sect A Min ind) V92, Oct 1983, PA173-A179 Where heterogeneity causes rock strength characteristics to vary over short lateral and/or vertical &stances. ~t ~s recommended that rock mass characteristics are determined during the dnUmg of production blastholes The momtonng of penetration rate and rotary torque m particular would allow the deterruination of boundaries at which ~t ts necessary to change the blast parameters Performance momtormg could prove part~cularly useful m overburden blast destgn m surface coal mines but would be of no value where rock strength remains constant and rock mass vanabd~ty ts caused by changes m the mean spacing between d~scontmumes
842308 Simple new blast vibration predictor (based on wave propagation laws) Ghosh, A, Daemen, J J K
Proc 24th US Symposium on Rock Meclumics, College Station, Texas, 20-23 June 1983 P151-161 Pub/ AEG, 1983 A simple new blast vibration pre&ctor ~s introduced The proposed formula has one factor to account for geometrical spreading and one factor corresponding to inelastic attenuation The form of the geometrical spreading function is based on hkely source geometries and on the propagation charactensUcs of the predominant wave type Comparison with data from actual mines shows better agreement than conventional methods
Cutting 842309 Drimng with high-pressure water jets GeodriUing NI5, Aprd 1982, P8-11 Presents extracts from 2 papers presented at the 5th lnternaUonai Symposmm on Jet Cutting to dlustrate the types of research currently being earned out research into the mechamsm of how h~gh-pressure jets penetrate hard rocks and research into nozzle design and configuration
842310 Single and malelple pass disc cutting in Slmp Granite Snowdon, R A, Ryley, M D Tunn Tumdg I"15, Nil, Not, 1983, P15-19
842302 Earth dam characteristics from full-scale vibrations
Drilling
Gazetas. G, Abdel-Ghaffar, A M Proc lOth International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 June 1981 V3, P207-210 Publ Rotterdam A A Balkema, 1981
See 842309
Comprehenswe full-scale tests mvolvmg earthquake, ambient and forced vtbratlons of numerous earth/rockfill dams from three countries are systemattcally evaluated Valuable mformat~on is obtained regarding the vanabdtty of key material properttes within a dam and thetr variation wtth mtenstty level and type of exotatlon Major charactensUcs of the response to various forces are ldenttfied and new rehable analytical models are thereby developed to assess the vtbrattonal behavlour of embankment dams m lateral and longatudmal &rectlons Auth
842303 Foundation rocking under earthquake loading Taylor, P W, Bartlett, P E, Wtessmg, P R Proc 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 Jane 1981 V3, P313-322 Publ Rotterdam A A Balkema, 1981 A s~mple theory ~s developed for the moment-rotatton behavtour of a ngld footmg under constant vertical load on a Wmkler-type foundation, extended to include uphft and yteld Laboratory tests on model footings on clay and on sand are reported which support the general theoreucal pre&cttons The moment-rotatton relauonshtp is found to be non-hnear as a result of the hftmg of one edge of the footing, even when the foundation material behaves elasucally At rocking amphtudes large enough to cause yleldmg beneath one edge, a strongly nonhnear moment rotation relatlonshtp is formed, wtth hystereuc damping The research shows that rotational yteid may occur under spread footings when earthquake loadmgs are apphed, w~thout serious detriment to vertical Ioad-beanng capacRy, and that, under statable condmons, verucal &splacement, even after several cycles of rocking, can be small
842304 Evaluation of earthquake-indnced permanent displacements for rock slopes Lln, J S
Proc 24th US Symposium on Rock Mechanics, College Station, Texas, 20-23 June 1983 P187-192 Publ AEG, 1983
Comminution of Rocks 8423O5 Comparison of efftciency of mechanical and explosive comminution Lundqmst, R G, Konya, C J Proc 24th US Symposium on Rock Mechanics, College Station, Texas, 20-23 June 1983 P181-186 Publ AEG, 1983 Energy effioency of blastmg and jaw crushmg was measured on the laboratory scale for a sand-cement mortar material It was determined that optlmtzed blasting uuhzes energy m producmg new surface area about 1700 umes as efficiently as crushing on a comparable scale On an energy cost basis blasting ts from 57 to over 700 Umes as efficient dependmg on the partacular explostve selected For some operattons tt may be econormcal to replace most or even all pnmary crushing with mcreased explosive fragmentation. Auth
Blasting 842306 Using geophysical logs in highwall blast design Hagan, T N, Gibson, I M int Assoc Engng Geol Bull N26-27, Dec 1982-June 1983, P77-81 (Paper to the Internattonal Symposmm on Sod and Rock Investlgatwns by In Sttu Testing, Paris, 18-20 Ma) 1983 ) Some, denstty, natural gamma and cahper logs are useful tools for increasing the cost-effecuveness of overburden blasts m surface coal mmmg Such logs give the blastmg engmeer a greater abfltty to opUmlze the &ameter and depth of blastholes, burden d~stance, blasthole spacmg, and the lengths of both backfill and stemmmg
8423O7 Performance monitoring of production blasthole drills - a means of increasing blasting effw.iency Hagan, T N, Retd. I W Trans Inst Min Metall (Sect A Min ind) V92, Oct 1983, PA173-A179 Where heterogeneity causes rock strength characteristics to vary over short lateral and/or vertical &stances. ~t ~s recommended that rock mass characteristics are determined during the dnUmg of production blastholes The momtonng of penetration rate and rotary torque m particular would allow the deterruination of boundaries at which ~t ts necessary to change the blast parameters Performance momtormg could prove part~cularly useful m overburden blast destgn m surface coal mines but would be of no value where rock strength remains constant and rock mass vanabd~ty ts caused by changes m the mean spacing between d~scontmumes
842308 Simple new blast vibration predictor (based on wave propagation laws) Ghosh, A, Daemen, J J K
Proc 24th US Symposium on Rock Meclumics, College Station, Texas, 20-23 June 1983 P151-161 Pub/ AEG, 1983 A simple new blast vibration pre&ctor ~s introduced The proposed formula has one factor to account for geometrical spreading and one factor corresponding to inelastic attenuation The form of the geometrical spreading function is based on hkely source geometries and on the propagation charactensUcs of the predominant wave type Comparison with data from actual mines shows better agreement than conventional methods
Cutting 842309 Drimng with high-pressure water jets GeodriUing NI5, Aprd 1982, P8-11 Presents extracts from 2 papers presented at the 5th lnternaUonai Symposmm on Jet Cutting to dlustrate the types of research currently being earned out research into the mechamsm of how h~gh-pressure jets penetrate hard rocks and research into nozzle design and configuration
842310 Single and malelple pass disc cutting in Slmp Granite Snowdon, R A, Ryley, M D Tunn Tumdg I"15, Nil, Not, 1983, P15-19