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The problem of behaviour of seismic waves in discontinuities
92A
a systematic s~rvey on the geomechanical properties of one particular region. The survey includes drawing of a geomec~mical map of the region giving the geomechanical properties of rock fcrmations to~ether with every type of information which might be useful in mining and civil engineering.
Core recovery, logging, probing, boring and sampling 865 VASILE~,AV MOSCOW CITY TRUST MOS(~RGEO TBEST, SU MEDVEDEV, OP MOSCOW CITY TRUST MOSGC~GEO TREST, SU EOZLOVSKII,VI MOSCOW CITY TRUST MOSGC~GEO TEEST, SU Recovery of soil monoliths by the vibration method. 2T, 3R. SOIL MECH. FOUNDATION ENG.VIO, NB,1973,P206-107. Tests have been carried out in crdar to st%~y the effect of vibration method of drivir6 soil samplers upon the reliability of the obtained characteristics and index properties of soils." The data presented confirm the usefulness of the vibration method.
8~ EARANDAEV, GZ SCI.RES. INST. EO~T.MIN~.TOGLIATTI, SU Rapid determination of the shear stremgth of sandy soils by the vibratimg probe method. 2F,1T,IR. SOIL MECH.FOD-~XATION ENG.VlO, NB,1973,P208-210. Since both plastic anl elastic strains depend upon the physicomechanical ~roperties of the soil, it is assigned that the structural qualities of soils can be predicted on %he basis of vibrating probe test data. This assumption is checked by investigation of three sandy soil mixtures. This investigation confirms the promise of the vibrating probe technique as a rapid method of shear strength determination. 867 ROCHA,M LAB. NAC.ENG. CIVIL,LISBON, P Integral sampling in boreholes. Congress. Discussion. 12F. PROCEED. 2 CONGRESS, INTERNAT. SOC.ROCK MECH.HELGRAD,
1970,v4,197~, Pl~-197. The author presents a sampling method which is based on recovery of a c ~ e previously reinforced by means of a bar. Conditions in the rock mass were simulated in laboratc~y by superposing different kinds of rock layers, separated by Joints, some of which remained opened, others were filled up with clayey materials of different consistencies. The method yields oriented samples of rock masses.
Geophysical techniques 868 BROCK, JS DYNASTY EXPLORATION, VANCOUVER, B .C.CDN Geophysical exploration leading to the discovery of the Faro deposit. 16F,ST,8R. CAN. INST .MIN.METALL.BULL .V66,N738,OCT.1973, P97 -ll6.
869 TOPF~, ED Geophysical techniques in g r e a t e r exploration, foumdation er~iueerlng and earthir~ e~gineering. Part 1. Geoalectric resistivity methods. Part 2. Seismic refraction methods. Figs,Tabl.sIRefs. J. ENGNG. INSTN. ZAMBIA,VI7, N3,1973 sP37-~.
87O MOSSMAN, RW HEIM,GE DALTON, FE Vibroseis applications to engineering work in an urban area. Figs,Tabls,Refs. GEOPHYSICS, V38, N3,1973, P489-~99. In 1967 and i~68, seismic exploration using the
VibroSeis system was eomducted in support of the Deep Tunnel PrOject of The Metropolitan Sanltary District of Greeter Chica~o to map certain ah~1]ow rock strata in which extensive t ~ 1 1 i n g was planned for relief of storm water overflow in the combined s e w ~ system of the Chicago area. The capabilities of this seismic system for operating under extreme conditions of ambient noise without disturbance to the urban envlrorment made the method ideal for providing detailed density of control at a much lower cost than ar~ other means. Results were relatively precise and have been largely confirmed by drillimg ard construction of tunnels in the area. Auth.
871 BEIVPACCHI,P ENEL, MILANO, I Seismic velocity used for in-situ investigations of fourdations; Congress: Discussion. P R O C ~ . 2 CONGRESS, INTERNAT. S0C.ROCK MECH. ~ELGRAD, 1970,V4,1974, P201. The National Electric Energy Agency (ENEL) Italy has developed some geophysical methods of testing dam foundations: There are two methods, now used in Bergamo: 1. The microseismic method and 2. Sonic logging. The de~ree of soumdmess of the rock is determined making reference to the ~ropagation of the waves where rock is urdisturbed. The methods give a clear indication of weathered rock zones or faulted and fissured rocks.
872 WERNER, D UN. FRID~ICANA, INST.BODEN.KAHLSRUHE, D The problem of behaviour of seismic waves in discontirali%ies. CO~ress. Discussion. In German. PROCE~.2 C O N G S E S S , ~ . S O C . I ~ C K MECH.~GRAD,
1970,V~, 197~,P205-206. An attempt is made to fired a relationship between discontinuities in rock masses and wave propagatlon.
873 KASPAR3M ORE RESEARCH INST.PRAHA, CS PECEN, J ORE BESEARCH INST.PRAHA, CS Pressure effects of a steep vein at great depth. C o ~ e s s . ~ Discussion. PROCEED.2 CONGRESS, INT~N~T.SOC.ROCK MECH.BELGRAD, 1970,V4,1974, P207-208. Natural seismic-acoustic phencmema of a rock massif have been observed for some time to forecast the pressure effects of t h e steep vein at a depth of 1500 m. The conclusion drs~n from this research ir~icates that the frequency of the seismlc-acous~ic activity of a rock massif cannot be used as the only one parameter for a successful forecast of pressures in a mine. The next step taken was to analyse t h e seismic activities using comptlters. This method proved to be more successful but also more expensive.
874 MOHLIER, P Deformability of rock masses. Congress. Discussion. In French; PROCEED. 2 CONGRESS, INTERNAT. SOC.ROCK MECH. HE,GRAD, 1970,V4,19~4, P235 • In Irevious papers l~esented at the Congress, a comparison between static smddymsmlc You~g's moduli was given. Paper N7 gives two properties which can be established in the laboratory; Both concern the velocity of waves umdmr shear. 1. In fissured or porous rock the wave velocity is independent of the fluid contents and its rm~ure; 2. In fissured rocks the dynamic shear modulus is equal to the static shear modulus. This phenomeraaon makes the measurement of wave velocity under shear much more useful then the measurement of longitudinal wave velocities •
a systematic s~rvey on the geomechanical properties of one particular region. The survey includes drawing of a geomec~mical map of the region giving the geomechanical properties of rock fcrmations to~ether with every type of information which might be useful in mining and civil engineering.
Core recovery, logging, probing, boring and sampling 865 VASILE~,AV MOSCOW CITY TRUST MOS(~RGEO TBEST, SU MEDVEDEV, OP MOSCOW CITY TRUST MOSGC~GEO TREST, SU EOZLOVSKII,VI MOSCOW CITY TRUST MOSGC~GEO TEEST, SU Recovery of soil monoliths by the vibration method. 2T, 3R. SOIL MECH. FOUNDATION ENG.VIO, NB,1973,P206-107. Tests have been carried out in crdar to st%~y the effect of vibration method of drivir6 soil samplers upon the reliability of the obtained characteristics and index properties of soils." The data presented confirm the usefulness of the vibration method.
8~ EARANDAEV, GZ SCI.RES. INST. EO~T.MIN~.TOGLIATTI, SU Rapid determination of the shear stremgth of sandy soils by the vibratimg probe method. 2F,1T,IR. SOIL MECH.FOD-~XATION ENG.VlO, NB,1973,P208-210. Since both plastic anl elastic strains depend upon the physicomechanical ~roperties of the soil, it is assigned that the structural qualities of soils can be predicted on %he basis of vibrating probe test data. This assumption is checked by investigation of three sandy soil mixtures. This investigation confirms the promise of the vibrating probe technique as a rapid method of shear strength determination. 867 ROCHA,M LAB. NAC.ENG. CIVIL,LISBON, P Integral sampling in boreholes. Congress. Discussion. 12F. PROCEED. 2 CONGRESS, INTERNAT. SOC.ROCK MECH.HELGRAD,
1970,v4,197~, Pl~-197. The author presents a sampling method which is based on recovery of a c ~ e previously reinforced by means of a bar. Conditions in the rock mass were simulated in laboratc~y by superposing different kinds of rock layers, separated by Joints, some of which remained opened, others were filled up with clayey materials of different consistencies. The method yields oriented samples of rock masses.
Geophysical techniques 868 BROCK, JS DYNASTY EXPLORATION, VANCOUVER, B .C.CDN Geophysical exploration leading to the discovery of the Faro deposit. 16F,ST,8R. CAN. INST .MIN.METALL.BULL .V66,N738,OCT.1973, P97 -ll6.
869 TOPF~, ED Geophysical techniques in g r e a t e r exploration, foumdation er~iueerlng and earthir~ e~gineering. Part 1. Geoalectric resistivity methods. Part 2. Seismic refraction methods. Figs,Tabl.sIRefs. J. ENGNG. INSTN. ZAMBIA,VI7, N3,1973 sP37-~.
87O MOSSMAN, RW HEIM,GE DALTON, FE Vibroseis applications to engineering work in an urban area. Figs,Tabls,Refs. GEOPHYSICS, V38, N3,1973, P489-~99. In 1967 and i~68, seismic exploration using the
VibroSeis system was eomducted in support of the Deep Tunnel PrOject of The Metropolitan Sanltary District of Greeter Chica~o to map certain ah~1]ow rock strata in which extensive t ~ 1 1 i n g was planned for relief of storm water overflow in the combined s e w ~ system of the Chicago area. The capabilities of this seismic system for operating under extreme conditions of ambient noise without disturbance to the urban envlrorment made the method ideal for providing detailed density of control at a much lower cost than ar~ other means. Results were relatively precise and have been largely confirmed by drillimg ard construction of tunnels in the area. Auth.
871 BEIVPACCHI,P ENEL, MILANO, I Seismic velocity used for in-situ investigations of fourdations; Congress: Discussion. P R O C ~ . 2 CONGRESS, INTERNAT. S0C.ROCK MECH. ~ELGRAD, 1970,V4,1974, P201. The National Electric Energy Agency (ENEL) Italy has developed some geophysical methods of testing dam foundations: There are two methods, now used in Bergamo: 1. The microseismic method and 2. Sonic logging. The de~ree of soumdmess of the rock is determined making reference to the ~ropagation of the waves where rock is urdisturbed. The methods give a clear indication of weathered rock zones or faulted and fissured rocks.
872 WERNER, D UN. FRID~ICANA, INST.BODEN.KAHLSRUHE, D The problem of behaviour of seismic waves in discontirali%ies. CO~ress. Discussion. In German. PROCE~.2 C O N G S E S S , ~ . S O C . I ~ C K MECH.~GRAD,
1970,V~, 197~,P205-206. An attempt is made to fired a relationship between discontinuities in rock masses and wave propagatlon.
873 KASPAR3M ORE RESEARCH INST.PRAHA, CS PECEN, J ORE BESEARCH INST.PRAHA, CS Pressure effects of a steep vein at great depth. C o ~ e s s . ~ Discussion. PROCEED.2 CONGRESS, INT~N~T.SOC.ROCK MECH.BELGRAD, 1970,V4,1974, P207-208. Natural seismic-acoustic phencmema of a rock massif have been observed for some time to forecast the pressure effects of t h e steep vein at a depth of 1500 m. The conclusion drs~n from this research ir~icates that the frequency of the seismlc-acous~ic activity of a rock massif cannot be used as the only one parameter for a successful forecast of pressures in a mine. The next step taken was to analyse t h e seismic activities using comptlters. This method proved to be more successful but also more expensive.
874 MOHLIER, P Deformability of rock masses. Congress. Discussion. In French; PROCEED. 2 CONGRESS, INTERNAT. SOC.ROCK MECH. HE,GRAD, 1970,V4,19~4, P235 • In Irevious papers l~esented at the Congress, a comparison between static smddymsmlc You~g's moduli was given. Paper N7 gives two properties which can be established in the laboratory; Both concern the velocity of waves umdmr shear. 1. In fissured or porous rock the wave velocity is independent of the fluid contents and its rm~ure; 2. In fissured rocks the dynamic shear modulus is equal to the static shear modulus. This phenomeraaon makes the measurement of wave velocity under shear much more useful then the measurement of longitudinal wave velocities •