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Optographic trace recording: a new method of strain measurement in geotechnical testing. Technical note
167A A paper presented at the 24th US Symposium on Rock Mechanics, 1983, not published in the conference proceedings. A large scale Block Test has been developed as part of the Basalt Waste Isolation Project. Design features include: location of the test block 1.5m back from the tunnel face to avoid blast damage, installation of flat jacks in grout boxes to allow removal and replacement in case of failure, use of a 275 ton capacity cable system to allow loading perpendicular to the tunnel face, and installation of an electro-optical deformation measurement system able to measure to an accuracy of 30 microns. 845034 Rock mass deformation properties from a large-scale block test Cramer, M L; Cunningham, J P; Kim, K
Bull Assoc Engng Geol V21, N1, Feb 1984, P47-54 A paper presented at the 24th US Symposium on Rock Mechanics, 1983, not published in the conference proceedings. A large scale Block Test is being conducted as part of the Basalt Waste Isolation Project. The primary measurement system to determine the rock deformational properties is the electrooptical Basalt Deformation Measurement System (BDMS). The deformation moduli and Poisson's ratio have been determined at ambient temperature at various confining stresses applied in different orientations. 845035 Behavioar of dry sand tested in a large triaxial apparatus Hettler, A; Vardoulakis, I
Geotechnique 1/34, N2, June 1984, P183-197
Different stress parameters have been used to describe states of stress in soil elements. It is suggested that for studying stressstrain behaviour of soils, the pair of stress parameters, mean effective stress and deviator stress should be used in triaxial conditions. For plane strain conditions, the parameters of mean stress in the plane of shearing and of maximum shear stress in the plane of shearing will be useful. 845039 Study of the hydrogeomechanical properties of rocks using experimental filtration tests and observations of ground water movement Mironenko, V A
lnt Assoc Engng Geol Bull N26-27, Dee 1982-June 1983, P489-491 (Paper to the International Symposium on Soil and Rock Investigations by In Situ Testing, Paris, 18-20 May 1983) The theory of how hydrogeomechanical processes, such as the stress-strain state of the rocks, affect pumping tests and the techniques of aquifer tests are discussed. It is suggested that aquifer test results may contribute to studies of rock mechanical characteristics such as compressibility and the stress-strain state of rocks. 845040 Ko-coeflicient of sand in triaxial apparatus. Technical note Feda, J
J Geotech Engng Div ASCE VllO, NGT4, April 1984, P519524
The results from an extensive experimental study of the stressstrain behaviour of dry sand in triaxial compression tests are presented. The experiments were performed in a new triaxial apparatus for large specimens. Emphasis is given to sources of error such as end restraint, bifurcation and imperfection sensitivity. The behaviour at small and large strains is presented and the rigid granular model of sand, its practical significance and limitations are discussed. Auth.
Experiments with dry sand in triaxial apparatus have demonstrated that Jaky's formula cannot be generally accepted. The coefficient of earth pressure at rest for normally consolidated soils depends on the stress path followed from the beginning of the test. A theory to evaluate this coefficient is proposed, using Rowe's stress-dilatancy relation. For an unloading path, an exponential relationship between the coefficient of earth pressure at rest for an overconsolidated soil and the overconsolidation ratio is verified.
845036 Note on the influence of fissures on the deformation characteristics of London clay. Technical note Costa-Filho, L M
845041 Experimental confirmation of some solutions of plane axisymmetric elastoplastic problems of soil mechanics Kustov, V P; Ruppeneit, K V
Geoteclmique V34, N2, June 1984, P268-272
Soil Mech Found Engng 1/20, N2, March-April 1983, P80-85
It is concluded from a review of experimental and analytical evidence that the effect of discontinuities on the initial portion of the stress-strain curve is reduced provided they are and do remain closed. 26 refs.
It is concluded that: (1) when soil is subjected to simple, axisymmettle, elastoplastic deformation, its behaviour is described well by a model incorporating the Coulomb-Mohr plasticity condition and the associated law relating stresses and strains - the cohesion and friction angle determined from this model agree very well with laboratory and field shear tests; (2) use of the Hencky relationships produces results that quantitatively and qualitatively contradict full-scale and laboratory test results; (3) use of the Mises-Botkin plasticity condition gives smaller values of cohesion and friction angle as compared to those determined by the Coulomb-Mohr condition.
845037 Optographic trace recording: a new method of strain measurement in geotechnical testing. Technical note Feeser, V
Geoteelmique V34, N2, June 1984, P277-281 A new method of measuring strain in specimens during laboratory triaxial testing is described. The surface of the sample is covered with fine luminous location points. These points change position during the test. By directing a camera at the sample and using an open shutter, the change in position can be ascertained as a trace on a photographic plate. The method has been used in the study of the failure mechanisms of stiff fissured clay. 845038 On stre~s parameters. Technical note Wood, D M
Geoteclmique V34, N2, June 1984, P282-287
845042 New joint element for the analysis of fractured rock Carol, I; Alonso, E E
Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 V2, PF147-F151. Publ Rotterdam: A. A. Balkema, 1983 A joint element believed to be an improvement on previous models has been developed for use in more general finite element codes. It incorporates all the relevant behaviour of joints in shear and compression and this is demonstrated with 2 examples.
Bull Assoc Engng Geol V21, N1, Feb 1984, P47-54 A paper presented at the 24th US Symposium on Rock Mechanics, 1983, not published in the conference proceedings. A large scale Block Test is being conducted as part of the Basalt Waste Isolation Project. The primary measurement system to determine the rock deformational properties is the electrooptical Basalt Deformation Measurement System (BDMS). The deformation moduli and Poisson's ratio have been determined at ambient temperature at various confining stresses applied in different orientations. 845035 Behavioar of dry sand tested in a large triaxial apparatus Hettler, A; Vardoulakis, I
Geotechnique 1/34, N2, June 1984, P183-197
Different stress parameters have been used to describe states of stress in soil elements. It is suggested that for studying stressstrain behaviour of soils, the pair of stress parameters, mean effective stress and deviator stress should be used in triaxial conditions. For plane strain conditions, the parameters of mean stress in the plane of shearing and of maximum shear stress in the plane of shearing will be useful. 845039 Study of the hydrogeomechanical properties of rocks using experimental filtration tests and observations of ground water movement Mironenko, V A
lnt Assoc Engng Geol Bull N26-27, Dee 1982-June 1983, P489-491 (Paper to the International Symposium on Soil and Rock Investigations by In Situ Testing, Paris, 18-20 May 1983) The theory of how hydrogeomechanical processes, such as the stress-strain state of the rocks, affect pumping tests and the techniques of aquifer tests are discussed. It is suggested that aquifer test results may contribute to studies of rock mechanical characteristics such as compressibility and the stress-strain state of rocks. 845040 Ko-coeflicient of sand in triaxial apparatus. Technical note Feda, J
J Geotech Engng Div ASCE VllO, NGT4, April 1984, P519524
The results from an extensive experimental study of the stressstrain behaviour of dry sand in triaxial compression tests are presented. The experiments were performed in a new triaxial apparatus for large specimens. Emphasis is given to sources of error such as end restraint, bifurcation and imperfection sensitivity. The behaviour at small and large strains is presented and the rigid granular model of sand, its practical significance and limitations are discussed. Auth.
Experiments with dry sand in triaxial apparatus have demonstrated that Jaky's formula cannot be generally accepted. The coefficient of earth pressure at rest for normally consolidated soils depends on the stress path followed from the beginning of the test. A theory to evaluate this coefficient is proposed, using Rowe's stress-dilatancy relation. For an unloading path, an exponential relationship between the coefficient of earth pressure at rest for an overconsolidated soil and the overconsolidation ratio is verified.
845036 Note on the influence of fissures on the deformation characteristics of London clay. Technical note Costa-Filho, L M
845041 Experimental confirmation of some solutions of plane axisymmetric elastoplastic problems of soil mechanics Kustov, V P; Ruppeneit, K V
Geoteclmique V34, N2, June 1984, P268-272
Soil Mech Found Engng 1/20, N2, March-April 1983, P80-85
It is concluded from a review of experimental and analytical evidence that the effect of discontinuities on the initial portion of the stress-strain curve is reduced provided they are and do remain closed. 26 refs.
It is concluded that: (1) when soil is subjected to simple, axisymmettle, elastoplastic deformation, its behaviour is described well by a model incorporating the Coulomb-Mohr plasticity condition and the associated law relating stresses and strains - the cohesion and friction angle determined from this model agree very well with laboratory and field shear tests; (2) use of the Hencky relationships produces results that quantitatively and qualitatively contradict full-scale and laboratory test results; (3) use of the Mises-Botkin plasticity condition gives smaller values of cohesion and friction angle as compared to those determined by the Coulomb-Mohr condition.
845037 Optographic trace recording: a new method of strain measurement in geotechnical testing. Technical note Feeser, V
Geoteelmique V34, N2, June 1984, P277-281 A new method of measuring strain in specimens during laboratory triaxial testing is described. The surface of the sample is covered with fine luminous location points. These points change position during the test. By directing a camera at the sample and using an open shutter, the change in position can be ascertained as a trace on a photographic plate. The method has been used in the study of the failure mechanisms of stiff fissured clay. 845038 On stre~s parameters. Technical note Wood, D M
Geoteclmique V34, N2, June 1984, P282-287
845042 New joint element for the analysis of fractured rock Carol, I; Alonso, E E
Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 V2, PF147-F151. Publ Rotterdam: A. A. Balkema, 1983 A joint element believed to be an improvement on previous models has been developed for use in more general finite element codes. It incorporates all the relevant behaviour of joints in shear and compression and this is demonstrated with 2 examples.