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Stress path, strength and dilatancy of rocks
26A
To d e t e r m i n e the cyclic stremgth of taillngs materials cyclic triaxial shear tests were carried ou~ on specimene of coarse sni fine ~ r a i ~ railings. The specimens were taken from different railings dam sites in C~ile ar~ Japan, plus 1 artificially ~round quartz power. Results showed that for the coarse tailir~s the cyclic stremgth was a little lower than for clean sand which has almost identical ~ s A n chsracterlsties. For the fine ~rained t a A l t ~ s cyclic s t r e r 6 t h was found to depend o n t h e consistency charac~eristlcs of the m~%erial. Fine grained railings classified as nor~lastlc were four~ to have a ,,~h lower cyclic strength than those classified as plastic.
822oZ~ m~AR ~
ANISOTROPY OF CLAY (ZN ~ALIA~)
Nqva, R Riv Ital Geotech, VIM, ~ , oct-Dec 1980,
~-2~ It is shown that the h~baviour of an inherently amlsotropic clay prior to failure may be described by an extension of the Cam Clay modal. Results from this new constitutive model are ccmpsre~ with e x ~ i m e n t a l results and it is c o n c l u d e d that t h e r e a s o n i n g b e h i n d t h e model is v a l i d but that furthe~ refinements are needed to get go~d quantitative s~reement.
8220~7 APPLICATION OF FINITE Y~'.m~EIVI'MEI'H(:~) (FE) FGR ESTIMATE OF STRESS IN STRATIFI~ ANISDTROI~C ROCK
MASSES (ZN &~m~c~O~.T) Vu~ic, J Rud Glas, N2, 1981 , P82-92 8220~8 STRESS PATH, STRENGTH AND DIIATANCY OF ROCKS Chen Yor~j Ya~ Xia~xi~ Ger~ Naiguar~ Scientia Sinica, V23, N~, April 1960, P~92-501 Triaxial ccmNresslon teats were carried out to study the strength ard dllata~cy of Jinan gabbro and C h a f i n g ~r,~-rdte along the following stress paths: case A, the maximmn principal stress was ir~rease~ until the rock failed, case B, confining pressure was decreased until ~ e rock ~tled, case C, confining pressure was increased (no rupture occorred in %his case). Both stremgth and dilatancy were found to be related to the stress path.
8220~9 SREAR ~
OF PLANES OF WEAKNESS IN BIOTITE SCHIST WITH SIMULATED BLAST D.~d~AG~8 Maki, K Swedish Dstonic Research Foumdation report DS 1981:4, 29 May 198.1, 5h.P
This wc~k presents the results of e×perlmental and ~Meeretleal atmales of the effect of movmments in rock Jclnts on the shear s t r e ~ of the Joints, Direct shear tests on continuous Joints with mated surfaces were evaluated in terms of the bilinear modal for the shear behaviour. A ccmparlson of the results with results from large scale direct shear tests on Joints from the rock confirm the validity of the model. Blast d a ~ e s in existing Joints were simulated by givlng the Joints a remaining aperture at the s t a r t o f shearing. The results show that the peak shear stre~6~h decreased due to remaini~ apertures in a way which was predicted by the cha2~e of the angle of inclination of the largest asperities on the sample surfaces. Avail: The Foumd~tion~ Box 32058, S-126 ii, Stockholm, Sweden
822050 STRESS CONCENTRATIONS IN THEUNIAXIALTENSILE ~ T H TEST WiJk, G SwedlshDetonic Research Fourdation report
z981:z4, 15 oct 1981, 8P The nature of the theoretical stress concentrations in the vicinities of the loaded areas of samples subjected to the uniexial tensile strength test is considered. Results from nmnerical calculations with the finite element method are cc~pered with experimental data from strain gauge measurements. The results are discussed in connection with strez~th measurements on rock materials. Auth. Avail: rFne Fourzlation, Box 32058, S-126 ii, Stockholm, Sweden
Deformation characteristics 822051 I N ~ r ~ D TRIAXIAL C ~ T FOR CYCLIC LOADING OF CLAYS Brown, S F; Austin$ G; Overy, R F Geotech Test J, V3, ~,Dec i~0, P145-152 The equipment described was developed for a fumdamental research study of the response of a silty clay to the type of cyclic loading associated with the foundations of offshore structures. Axial and radial deformations are m e a s t ~ e d d i r e c t l y o n t h e sample d u r i n g b o t h consolidation and subsequent cyclic loading. Stiff, sensitive systems measure pore pressure both at the base and at the centre of the specimen. A novel load cell built into the loading ram determines deviator stress and a pressure transducer monitors confining stress. Special fittings provide long term lubrication of leading platens. A servo-system permits consolidation under zero radial strain conditions.
822052 ~PIRICAL
EVALUATION OF P R E S S ~ TEST DATA Arnold, M Can Geotech J, V18, N3, Aug I~i, P455-~59 Graphical procedures are c~m~only used to derive the maximum urzlrained shear stress ani the undrained modulus value from test data. An empirically-derived analytical relationship based on Kor~h~r's hyperbolic stress-straln relationship is presented which overcomes the disadvantages of the graphical procedure.
822053 CO4HISITE MODEL FOR THE ANISOTROFIC ELASTIC MODULI OF LEAN OIL SHALE Rumdle, J B; Schuler, K W GeOl~hysics, V~6, N2, Feb 1981, P163-171 A modal to predict the anisotropic elastic moduli of lean oil shale is formulated. Deformation of homogeneous elllpsoldal inclusion in a host matrix is used as the basis for coml~Itlng the deformation of the composite. Both inclusions and the host rock are presmmed to be separately isotroplc. Anls~ol~" of the composite arises from the non-s~herical shape of the kerogen inclusions. Six parameters are needed to quantify the model fully: two elastic modull for the host rock, two for the inclusions, the kerogen content, add the inclusion aspect ratio. The modal is compared to a set of statically measured elastic moduli. Good a6reement with lean oil shale data was found. However, some systematic differences appear in comparison with moduli measured ultrasonically. Auth.
To d e t e r m i n e the cyclic stremgth of taillngs materials cyclic triaxial shear tests were carried ou~ on specimene of coarse sni fine ~ r a i ~ railings. The specimens were taken from different railings dam sites in C~ile ar~ Japan, plus 1 artificially ~round quartz power. Results showed that for the coarse tailir~s the cyclic stremgth was a little lower than for clean sand which has almost identical ~ s A n chsracterlsties. For the fine ~rained t a A l t ~ s cyclic s t r e r 6 t h was found to depend o n t h e consistency charac~eristlcs of the m~%erial. Fine grained railings classified as nor~lastlc were four~ to have a ,,~h lower cyclic strength than those classified as plastic.
822oZ~ m~AR ~
ANISOTROPY OF CLAY (ZN ~ALIA~)
Nqva, R Riv Ital Geotech, VIM, ~ , oct-Dec 1980,
~-2~ It is shown that the h~baviour of an inherently amlsotropic clay prior to failure may be described by an extension of the Cam Clay modal. Results from this new constitutive model are ccmpsre~ with e x ~ i m e n t a l results and it is c o n c l u d e d that t h e r e a s o n i n g b e h i n d t h e model is v a l i d but that furthe~ refinements are needed to get go~d quantitative s~reement.
8220~7 APPLICATION OF FINITE Y~'.m~EIVI'MEI'H(:~) (FE) FGR ESTIMATE OF STRESS IN STRATIFI~ ANISDTROI~C ROCK
MASSES (ZN &~m~c~O~.T) Vu~ic, J Rud Glas, N2, 1981 , P82-92 8220~8 STRESS PATH, STRENGTH AND DIIATANCY OF ROCKS Chen Yor~j Ya~ Xia~xi~ Ger~ Naiguar~ Scientia Sinica, V23, N~, April 1960, P~92-501 Triaxial ccmNresslon teats were carried out to study the strength ard dllata~cy of Jinan gabbro and C h a f i n g ~r,~-rdte along the following stress paths: case A, the maximmn principal stress was ir~rease~ until the rock failed, case B, confining pressure was decreased until ~ e rock ~tled, case C, confining pressure was increased (no rupture occorred in %his case). Both stremgth and dilatancy were found to be related to the stress path.
8220~9 SREAR ~
OF PLANES OF WEAKNESS IN BIOTITE SCHIST WITH SIMULATED BLAST D.~d~AG~8 Maki, K Swedish Dstonic Research Foumdation report DS 1981:4, 29 May 198.1, 5h.P
This wc~k presents the results of e×perlmental and ~Meeretleal atmales of the effect of movmments in rock Jclnts on the shear s t r e ~ of the Joints, Direct shear tests on continuous Joints with mated surfaces were evaluated in terms of the bilinear modal for the shear behaviour. A ccmparlson of the results with results from large scale direct shear tests on Joints from the rock confirm the validity of the model. Blast d a ~ e s in existing Joints were simulated by givlng the Joints a remaining aperture at the s t a r t o f shearing. The results show that the peak shear stre~6~h decreased due to remaini~ apertures in a way which was predicted by the cha2~e of the angle of inclination of the largest asperities on the sample surfaces. Avail: The Foumd~tion~ Box 32058, S-126 ii, Stockholm, Sweden
822050 STRESS CONCENTRATIONS IN THEUNIAXIALTENSILE ~ T H TEST WiJk, G SwedlshDetonic Research Fourdation report
z981:z4, 15 oct 1981, 8P The nature of the theoretical stress concentrations in the vicinities of the loaded areas of samples subjected to the uniexial tensile strength test is considered. Results from nmnerical calculations with the finite element method are cc~pered with experimental data from strain gauge measurements. The results are discussed in connection with strez~th measurements on rock materials. Auth. Avail: rFne Fourzlation, Box 32058, S-126 ii, Stockholm, Sweden
Deformation characteristics 822051 I N ~ r ~ D TRIAXIAL C ~ T FOR CYCLIC LOADING OF CLAYS Brown, S F; Austin$ G; Overy, R F Geotech Test J, V3, ~,Dec i~0, P145-152 The equipment described was developed for a fumdamental research study of the response of a silty clay to the type of cyclic loading associated with the foundations of offshore structures. Axial and radial deformations are m e a s t ~ e d d i r e c t l y o n t h e sample d u r i n g b o t h consolidation and subsequent cyclic loading. Stiff, sensitive systems measure pore pressure both at the base and at the centre of the specimen. A novel load cell built into the loading ram determines deviator stress and a pressure transducer monitors confining stress. Special fittings provide long term lubrication of leading platens. A servo-system permits consolidation under zero radial strain conditions.
822052 ~PIRICAL
EVALUATION OF P R E S S ~ TEST DATA Arnold, M Can Geotech J, V18, N3, Aug I~i, P455-~59 Graphical procedures are c~m~only used to derive the maximum urzlrained shear stress ani the undrained modulus value from test data. An empirically-derived analytical relationship based on Kor~h~r's hyperbolic stress-straln relationship is presented which overcomes the disadvantages of the graphical procedure.
822053 CO4HISITE MODEL FOR THE ANISOTROFIC ELASTIC MODULI OF LEAN OIL SHALE Rumdle, J B; Schuler, K W GeOl~hysics, V~6, N2, Feb 1981, P163-171 A modal to predict the anisotropic elastic moduli of lean oil shale is formulated. Deformation of homogeneous elllpsoldal inclusion in a host matrix is used as the basis for coml~Itlng the deformation of the composite. Both inclusions and the host rock are presmmed to be separately isotroplc. Anls~ol~" of the composite arises from the non-s~herical shape of the kerogen inclusions. Six parameters are needed to quantify the model fully: two elastic modull for the host rock, two for the inclusions, the kerogen content, add the inclusion aspect ratio. The modal is compared to a set of statically measured elastic moduli. Good a6reement with lean oil shale data was found. However, some systematic differences appear in comparison with moduli measured ultrasonically. Auth.