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Shear strength of claystone and limestone in Jura
77A
In French. 4F. PROCk~D.2 CONGRESS, I I ~ T . S O C . R O C K MECH.BELGRAD, 1970,V4,1974, P232-233. Compression te~ts done on schists presente~ mamy difficulties due to weathering alterations, characteristic to all rocks of poor permeability; These alteraT~ions obstruct dissipation of interstitial stresses in the zone affected by the experiment; A special experimental procedure has been acqlz[red, applyimg cycles of intensive loading in time intervals; The whole experiment took 80 hours. Other investigations incl~rled uniaxial ~ triaxial cce~pression tests on intact specimens; Results of both types of experiments are compared on stress-strain curves;
716 MLADYENUVITCH,V COYNE ET ~ T r ~ R , BUR.I~3.CONS.PARIS, F Deformability of rock masses, effect of loading. Congress; Discussion:- In French. 5F. P R O C ~ . 2 CONGRESS, INT~RNAT.SOC.ROCK MECH.BELGRAD, 1970,V~, 1974, P233-235. Formulae for displacements in depth of a rock mass caused by loading on the surface, have been presented. The formulae have been calculated using the equations of Boussineeq ard Cerrutiv Examples are given; 717 REBOLLO, A Deformability at depth of a rock mass. Congress; Discussion; 2F. PROCEED.2 CONGRESS, INTERNAT.SOC.ROCK MECH.B~IERAD, 1970,V4,1974, P2~I. The author gives an example of vertical deformations which occurred in a rock mass during construction, of a dam, in Spain.-
718 ENDOKIMOV, PD VNIIG IM.VENEDENEEVA, LENI N3RAD, SU Mechanical resistance of rock masses; Review. Congress; In Er4~lish, French end German. llR. FROC~D.2 CONDRESS, INTERNAT.SOC.ROCK M E C H . ~ , 1970,V4,1974, P260-300. The reporter based the review on 53 papers presented at the Conference, The review starts with an account of the recent state of knowledge underlining the problem of evaluation of the strength of rock masses in-situ, of assessment of the stability of matural and excavated slopes amd the shearing strength and stability of rock fourdations, referring especially to hydraulic structures whose foundations ere subJeered t o shearing loads ~ hydrodymsmic pressures of wate~. The subject is divided into the following chapters: i. Shear strength of rock masses; 2. Shear strength along Joints of rocks; 3. The strength of solid blocks of a rock mass in CC~l~ession, tension and shear; 719 KRSMANOVIC,D UNIV.OBALA VOJVODE STEPE,SARAJEVO,YU The initial and residual shear resistances; Congress; Discussion: 8F, 2T, 2R. PROCEED. 2 CONGRESS, I RNAT.SOC.ROCK MECH. HELGRAD, 1970,V4,1974,P322-326. The author presents results of a large n ~ e r of shear tests with compact blocks of rocks; The tests were carried out by direct shearing of rocks of different types on large laboratory scale with different normal pressures and with different magnitudes of shear deformations; It was found that the compact rocks, depending on their strength, behave differently at the direct shearirg both in qualitative and quantitative aspects; The types of tested rocks and the data on test corditions, together with limit values of parameters are listed; The values of sheer resistances are given far each type of tested rocks;
720 WACKERNAGEL, A ETH,BASEL, SD Shear strength of claystone and limestone in Jura.
Congress; Discussion: In German, 7F. P R O C ~ , 2 CO~GRESS, INI~RNAT.SOC.ROCK MECH.~nRAD,
1970,V4,1974,P3o4-3o8. A surface slip occurred in Eptingen, Switzerlaud destroying the limestone slopes of the valley; Sheer tests on limestone stud claystones have been initiated and their results indicsted a large defc~ion. The slopes have been st~ppcrted with rock anchars:° The stability calculations took into account the Joint orientation and the sheer stremgth of the rocks; Labc~story tests were in good agreement with the mathematical analyses; 721 D~41RI S, C Definition of rock strain by applying tension; Congress:- Discussion; In French: 5F. PROCEED.2 CO~RESS, INI~RNAT.SOC.ROCK MECH.BELGRAD, 1970,V~, 197~, P308-310. The method is described and the main parameters which influence the method ere discussed, The fracture of marble and granite cylindrical specimens has been investigated; Special attention has been paid to the size of the sDhere adherent to the specimen durimg application of the force of the specimen. Comparison with other methods has been done; 722 HUGGE~, AU Teleroakmeter, an instrument for rock strain measurement. Comgress; Discussion; In German; 6F. PROCEED.2 CONGRESS, INT~NAT.SOC.ROCK MECH.H~LGRAD, 1970,V4,1974, P326-328. 723 VIADUT,T INST.DE STUDI I,HIDROENERG~2I CE~BUCAHEST,R Studies on shear resistance A Comgress. Conclusions; In French. 2F. PROCEED.2 CON3EESS, I N T ~ . S O C . R O C K MECH.BELGRAD, 1970, V4,1974,P341-342. Investigations on determination of shear resistance of rocks have been carried out in R ~ m ~ l a , on a dam, which foundation was of gneiss changed by the l~rocess of cataclasis; The main l~roblem was to identify the role and action of water under pressure. This was studied from two parallel observation bcreholes situated at various distances from the bcrehole under shear loading and water pressure; The results indicated that the gneiss has not been influenced either by shear or by water.
724 MIIAhKY~C, D KONSTRUE~OR, SPLIT,YU E ~ u a t i o n of the modulus of deformation ~nder shear and compression. Cor~ess. Discussion. In French. 2F. PROCEED.2 CONGRESS, INT~NAT.SOC.ROCK MECH.~_~PJU), 1970,V4,1974,P342-343 •
Friction in rocks 725 RENGERS, N UNIV.KARLSRUHE,D Rock mechanics research in Karlsruhe. Congress. Discussion; 2F. PROCEED.2 CO~3EESS, I N I ~ . S O C . R O C K MECH.BELGRAD, 1970,V4,1974,P338. The writer reports on shear-and friction testsj amd on co~relation between field and laboratory testing; Roughness characteristics of a few rock separation planes are demor~rated. Dilatancy characteristics of a tension Joint and a shear zone, both in sandstone are discussed. The importance of the value of dilation in underground structures is umderlined.
In French. 4F. PROCk~D.2 CONGRESS, I I ~ T . S O C . R O C K MECH.BELGRAD, 1970,V4,1974, P232-233. Compression te~ts done on schists presente~ mamy difficulties due to weathering alterations, characteristic to all rocks of poor permeability; These alteraT~ions obstruct dissipation of interstitial stresses in the zone affected by the experiment; A special experimental procedure has been acqlz[red, applyimg cycles of intensive loading in time intervals; The whole experiment took 80 hours. Other investigations incl~rled uniaxial ~ triaxial cce~pression tests on intact specimens; Results of both types of experiments are compared on stress-strain curves;
716 MLADYENUVITCH,V COYNE ET ~ T r ~ R , BUR.I~3.CONS.PARIS, F Deformability of rock masses, effect of loading. Congress; Discussion:- In French. 5F. P R O C ~ . 2 CONGRESS, INT~RNAT.SOC.ROCK MECH.BELGRAD, 1970,V~, 1974, P233-235. Formulae for displacements in depth of a rock mass caused by loading on the surface, have been presented. The formulae have been calculated using the equations of Boussineeq ard Cerrutiv Examples are given; 717 REBOLLO, A Deformability at depth of a rock mass. Congress; Discussion; 2F. PROCEED.2 CONGRESS, INTERNAT.SOC.ROCK MECH.B~IERAD, 1970,V4,1974, P2~I. The author gives an example of vertical deformations which occurred in a rock mass during construction, of a dam, in Spain.-
718 ENDOKIMOV, PD VNIIG IM.VENEDENEEVA, LENI N3RAD, SU Mechanical resistance of rock masses; Review. Congress; In Er4~lish, French end German. llR. FROC~D.2 CONDRESS, INTERNAT.SOC.ROCK M E C H . ~ , 1970,V4,1974, P260-300. The reporter based the review on 53 papers presented at the Conference, The review starts with an account of the recent state of knowledge underlining the problem of evaluation of the strength of rock masses in-situ, of assessment of the stability of matural and excavated slopes amd the shearing strength and stability of rock fourdations, referring especially to hydraulic structures whose foundations ere subJeered t o shearing loads ~ hydrodymsmic pressures of wate~. The subject is divided into the following chapters: i. Shear strength of rock masses; 2. Shear strength along Joints of rocks; 3. The strength of solid blocks of a rock mass in CC~l~ession, tension and shear; 719 KRSMANOVIC,D UNIV.OBALA VOJVODE STEPE,SARAJEVO,YU The initial and residual shear resistances; Congress; Discussion: 8F, 2T, 2R. PROCEED. 2 CONGRESS, I RNAT.SOC.ROCK MECH. HELGRAD, 1970,V4,1974,P322-326. The author presents results of a large n ~ e r of shear tests with compact blocks of rocks; The tests were carried out by direct shearing of rocks of different types on large laboratory scale with different normal pressures and with different magnitudes of shear deformations; It was found that the compact rocks, depending on their strength, behave differently at the direct shearirg both in qualitative and quantitative aspects; The types of tested rocks and the data on test corditions, together with limit values of parameters are listed; The values of sheer resistances are given far each type of tested rocks;
720 WACKERNAGEL, A ETH,BASEL, SD Shear strength of claystone and limestone in Jura.
Congress; Discussion: In German, 7F. P R O C ~ , 2 CO~GRESS, INI~RNAT.SOC.ROCK MECH.~nRAD,
1970,V4,1974,P3o4-3o8. A surface slip occurred in Eptingen, Switzerlaud destroying the limestone slopes of the valley; Sheer tests on limestone stud claystones have been initiated and their results indicsted a large defc~ion. The slopes have been st~ppcrted with rock anchars:° The stability calculations took into account the Joint orientation and the sheer stremgth of the rocks; Labc~story tests were in good agreement with the mathematical analyses; 721 D~41RI S, C Definition of rock strain by applying tension; Congress:- Discussion; In French: 5F. PROCEED.2 CO~RESS, INI~RNAT.SOC.ROCK MECH.BELGRAD, 1970,V~, 197~, P308-310. The method is described and the main parameters which influence the method ere discussed, The fracture of marble and granite cylindrical specimens has been investigated; Special attention has been paid to the size of the sDhere adherent to the specimen durimg application of the force of the specimen. Comparison with other methods has been done; 722 HUGGE~, AU Teleroakmeter, an instrument for rock strain measurement. Comgress; Discussion; In German; 6F. PROCEED.2 CONGRESS, INT~NAT.SOC.ROCK MECH.H~LGRAD, 1970,V4,1974, P326-328. 723 VIADUT,T INST.DE STUDI I,HIDROENERG~2I CE~BUCAHEST,R Studies on shear resistance A Comgress. Conclusions; In French. 2F. PROCEED.2 CON3EESS, I N T ~ . S O C . R O C K MECH.BELGRAD, 1970, V4,1974,P341-342. Investigations on determination of shear resistance of rocks have been carried out in R ~ m ~ l a , on a dam, which foundation was of gneiss changed by the l~rocess of cataclasis; The main l~roblem was to identify the role and action of water under pressure. This was studied from two parallel observation bcreholes situated at various distances from the bcrehole under shear loading and water pressure; The results indicated that the gneiss has not been influenced either by shear or by water.
724 MIIAhKY~C, D KONSTRUE~OR, SPLIT,YU E ~ u a t i o n of the modulus of deformation ~nder shear and compression. Cor~ess. Discussion. In French. 2F. PROCEED.2 CONGRESS, INT~NAT.SOC.ROCK MECH.~_~PJU), 1970,V4,1974,P342-343 •
Friction in rocks 725 RENGERS, N UNIV.KARLSRUHE,D Rock mechanics research in Karlsruhe. Congress. Discussion; 2F. PROCEED.2 CO~3EESS, I N I ~ . S O C . R O C K MECH.BELGRAD, 1970,V4,1974,P338. The writer reports on shear-and friction testsj amd on co~relation between field and laboratory testing; Roughness characteristics of a few rock separation planes are demor~rated. Dilatancy characteristics of a tension Joint and a shear zone, both in sandstone are discussed. The importance of the value of dilation in underground structures is umderlined.