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Gravitationally induced stresses around a large impact crater
232A
TRANS. TECH. PUBLICATIONS, V2,1975, 200P. This volume deals with the im:o~lem of 1~ar~latory passive resistance, rotatlomal passive resistance aml toe reslstance beyomd the at rest state of eq-~1~brium of the far material, is. when the retaining wall u~le~goes a displacement unler the action of t h e fcrces feeding to puah back the material upon itself.
Base courses and pavements of roads, railways and airfields 23O3 BROWN, SF UNIV. N ~ I ~ ; H A M , GB Repeated load testing of a grarAtlar material. 15F, 3T, IIR. J. GEOTECH. ENGNG. DIV. VI00, N •G ~ , JULY, 1974, I=@25-8~i. Repeated load triaxial tests were carried out on samples of a particular fine crtt~hed stone all c ~ to the same demsity and moisture comlitions. The experimental procedure is described and the results amalysed using the resilient modulus concept.
Construction m e t h o d s
Experimental and numerical techniques See also abstract:
2266.
2308 THC~4~EN,JM LAWRENCE L ~ R E LAB.UNIV.CALIF.USA BRYAN, JB LAWI~ LIVE~ IJ4B.UNIV.CAI/F.USA B ~ N , DE LAWRENCE LIVE~ORE LAB.UNIV.CALIF.USA A technique fc~ medellir~ of explosively formed craters. Abstract of pape~ for Fall Armual Meetimg, December 1973. Paper $8. EOS.TRANS.AMER.GEOPHYS.UNION,V54, Nil, NOV. 1973, PI132.
Comminution of rocks 2309 ~3G, S NYBROVEJ, SOPHIENHOLM, DK Cn,,,Inu~ion in the light of particle size analysis. 17F, IOR. P O W D ~ TECHNOL.VI0, NI- 2,JULY-AUG. 1974, PI-8.
230b, 'IDOMBS,AF
The perfcammmce of a caterpillar 815-17 M~ tamping roller in the compaction of soil. Figs, Refs. TRANSPORT AND ROAD RES.LAB.CROWTHDRNE, U.K. P~I~T, N PB-219 996-6,1973,23P. 2305 RODIONOV, VN V0VK, AA CH~,GI Digging camals amd trenches by means of line blasting. IF,4T, IR. SOVIET MIN. SCl .Vg,N2, MAR-APR. 1973, P17~-180.
G roundwater problems 2306 SLIWINSKI, ZJ Permeability of concrete diaphrs4~n walls. 6F. GROUND E ~ . V T , N4, JULY, 1974, P21-23. Concrete dial~hra~ walls are often used in constructions which require protection against water. This paper discusses the permeability of these wells in two parts'the permeability of panels and the permeability of Joints. Work by other researchers is discussed and the factors upon which the degree of protection against water depends, are revizwed.
Rock fracture under dynamic stresses 2310 V Y ~ Z H A N ~ N , VN K U Z B A S S t ~ CGMBINE, SU Proba~ilistlc ~dellimg of shock bumps in planmirg the developmemt of mimimg operations. 2F,3R. SOVIET MIN.SCI.Vg,~,ZULY-AUG.1973, P353-358. The pape~ looms i ~ o the possibility of minimizi~ the hazard of shock btlnps. The probability predictions are based on the physical state of the processes occurring at the time of a shock bump. Two parameters are taken into account: the probability of occurrence of a bump at time t, a~1 the intamsity of the pheDmmenon at time t. An algorithm is suggested which permits a shock bump to be re~mxled as a controlled process. This means that by choosing the best methods the occurrence of shock bumps, can be greatly reduced. In ~d~tion, using various preventive measures, e.g. wet-~ir6, the mechanical p~operties of coal can be altered.
Drilling 2311 LEVETUS, FB CAGNIONCLE, G Completely hydraulic rotary percussive rock drills.
Figs.
Influence of dynamic loads due to explosions or earthquakes 2307 DEIF2,B UNIV. STANFORD, CALIFORNIA, USA Gravitationally induced stresses around a large impact crater. Abstract of psper for Fall Annual Meetir~, December 1973. Paper T40. EOS.TRANS.AMER.GEOPHYS.UNION,V54, ~.~l,NOV.1973}p1207. Studies of lunar impact craters indicate a correlation between central u~lifts ani large-scale sl~npi~g of the crater walls. Calculations were conducted to determine the stresses set up by gravity when a crater-like excavation is made in an elastic half-space. The calculated stresses would produce failure by small-scale slumping of the crater wells directly into the crater rather than deep-seated slumping that would push up the crater floor and Iroduce cemtral uplift. Auth.
FLUID POWER, V39, APR. 197~, P35- 38 • This article describes, some of t h e problems to be overcome and the methods selected to solve them, in a type of rotary percussive drill developed as a Joint l~odttc~ between a French and a British firm. The perfo~msr~e of this machine is compared to that of compressed air machines and conclusions are drawn regarding the usefulness of this type of machine and of hydraulic impact devices in general. 2312 THIES, W [rrillir~ tool. Patent. UK PATENT NO.1,352,960,WALLRAM H A R ~ A L L
GM~.NOV.
26TH 1971,MAY l~r~ 1974. A rotary-percussive rock drill has a collar behind a w i d e r ~ cuttir~ head. Scourimg air ducts extemd from the collar to the euttimg edges of the drill.
TRANS. TECH. PUBLICATIONS, V2,1975, 200P. This volume deals with the im:o~lem of 1~ar~latory passive resistance, rotatlomal passive resistance aml toe reslstance beyomd the at rest state of eq-~1~brium of the far material, is. when the retaining wall u~le~goes a displacement unler the action of t h e fcrces feeding to puah back the material upon itself.
Base courses and pavements of roads, railways and airfields 23O3 BROWN, SF UNIV. N ~ I ~ ; H A M , GB Repeated load testing of a grarAtlar material. 15F, 3T, IIR. J. GEOTECH. ENGNG. DIV. VI00, N •G ~ , JULY, 1974, I=@25-8~i. Repeated load triaxial tests were carried out on samples of a particular fine crtt~hed stone all c ~ to the same demsity and moisture comlitions. The experimental procedure is described and the results amalysed using the resilient modulus concept.
Construction m e t h o d s
Experimental and numerical techniques See also abstract:
2266.
2308 THC~4~EN,JM LAWRENCE L ~ R E LAB.UNIV.CALIF.USA BRYAN, JB LAWI~ LIVE~ IJ4B.UNIV.CAI/F.USA B ~ N , DE LAWRENCE LIVE~ORE LAB.UNIV.CALIF.USA A technique fc~ medellir~ of explosively formed craters. Abstract of pape~ for Fall Armual Meetimg, December 1973. Paper $8. EOS.TRANS.AMER.GEOPHYS.UNION,V54, Nil, NOV. 1973, PI132.
Comminution of rocks 2309 ~3G, S NYBROVEJ, SOPHIENHOLM, DK Cn,,,Inu~ion in the light of particle size analysis. 17F, IOR. P O W D ~ TECHNOL.VI0, NI- 2,JULY-AUG. 1974, PI-8.
230b, 'IDOMBS,AF
The perfcammmce of a caterpillar 815-17 M~ tamping roller in the compaction of soil. Figs, Refs. TRANSPORT AND ROAD RES.LAB.CROWTHDRNE, U.K. P~I~T, N PB-219 996-6,1973,23P. 2305 RODIONOV, VN V0VK, AA CH~,GI Digging camals amd trenches by means of line blasting. IF,4T, IR. SOVIET MIN. SCl .Vg,N2, MAR-APR. 1973, P17~-180.
G roundwater problems 2306 SLIWINSKI, ZJ Permeability of concrete diaphrs4~n walls. 6F. GROUND E ~ . V T , N4, JULY, 1974, P21-23. Concrete dial~hra~ walls are often used in constructions which require protection against water. This paper discusses the permeability of these wells in two parts'the permeability of panels and the permeability of Joints. Work by other researchers is discussed and the factors upon which the degree of protection against water depends, are revizwed.
Rock fracture under dynamic stresses 2310 V Y ~ Z H A N ~ N , VN K U Z B A S S t ~ CGMBINE, SU Proba~ilistlc ~dellimg of shock bumps in planmirg the developmemt of mimimg operations. 2F,3R. SOVIET MIN.SCI.Vg,~,ZULY-AUG.1973, P353-358. The pape~ looms i ~ o the possibility of minimizi~ the hazard of shock btlnps. The probability predictions are based on the physical state of the processes occurring at the time of a shock bump. Two parameters are taken into account: the probability of occurrence of a bump at time t, a~1 the intamsity of the pheDmmenon at time t. An algorithm is suggested which permits a shock bump to be re~mxled as a controlled process. This means that by choosing the best methods the occurrence of shock bumps, can be greatly reduced. In ~d~tion, using various preventive measures, e.g. wet-~ir6, the mechanical p~operties of coal can be altered.
Drilling 2311 LEVETUS, FB CAGNIONCLE, G Completely hydraulic rotary percussive rock drills.
Figs.
Influence of dynamic loads due to explosions or earthquakes 2307 DEIF2,B UNIV. STANFORD, CALIFORNIA, USA Gravitationally induced stresses around a large impact crater. Abstract of psper for Fall Annual Meetir~, December 1973. Paper T40. EOS.TRANS.AMER.GEOPHYS.UNION,V54, ~.~l,NOV.1973}p1207. Studies of lunar impact craters indicate a correlation between central u~lifts ani large-scale sl~npi~g of the crater walls. Calculations were conducted to determine the stresses set up by gravity when a crater-like excavation is made in an elastic half-space. The calculated stresses would produce failure by small-scale slumping of the crater wells directly into the crater rather than deep-seated slumping that would push up the crater floor and Iroduce cemtral uplift. Auth.
FLUID POWER, V39, APR. 197~, P35- 38 • This article describes, some of t h e problems to be overcome and the methods selected to solve them, in a type of rotary percussive drill developed as a Joint l~odttc~ between a French and a British firm. The perfo~msr~e of this machine is compared to that of compressed air machines and conclusions are drawn regarding the usefulness of this type of machine and of hydraulic impact devices in general. 2312 THIES, W [rrillir~ tool. Patent. UK PATENT NO.1,352,960,WALLRAM H A R ~ A L L
GM~.NOV.
26TH 1971,MAY l~r~ 1974. A rotary-percussive rock drill has a collar behind a w i d e r ~ cuttir~ head. Scourimg air ducts extemd from the collar to the euttimg edges of the drill.