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886061 Effects of initial anisotropic fabric and intermediate principal stress on strength and deformation characteristics of sand
268A 886055 Cyclic soil data for design of gravity structures Andersen, K H; Kleven, A; Heien, D J Geotech Engng Div ASCE V114, N5, May 1988, P517-539
886059 Compression of two dimensional model granular materials (In French) Travers, T; Ammi, M; Bideau, D; Gervois, A; Lemaitre, J; Messager, J C; Troadec, J P Rev Fr Geotech N43, 1988, P21-34
Foundation design problems related to undrained cyclic loading of clay soils are briefly reviewed. Stress conditions beneath a gravity structure are examined. A laboratory testing program to obtain necessary soil data for analysis of the problem is described. Results from undrained cyclic triaxial and direct simple shear tests on Drammen clay are presented. These data provide general knowledge about soil behaviour under cyclic loading and form the basis of a database to be used in determining soil parameters for early feasibility studies of gravity structures, designing test programs, and development of theoretical models.
Experiments carried out on a matrix of horizontal cylindrical rods under confined vertical compression are reported. Influences due to packing geometry and the effects of mixing hard and soft grains were examined. Two distinct regimes were evident, one of consolidation, the other post consolidation. Power law stress strain relations held in both cases. Effects of equipment walls and the size of the matrix of rods were also investigated. Results were often supported by photoelastic observations.
886056 Can Cam-clay model be generalized? Srinivasa Murthy, B R; Vatsala, A; Nagaraj, T S J Geotech Engng Div ASCE Vl14, N5. May 1988, P601-613
Undrained shear strength of remoulded marine clays Nakase, A; Kamei, T Soils Found V28, Nl, March 1988, P29-40
The Cam clay model, based on critical state concepts fitted into the theory of plasticity, requires determination of four parameters to enable prediction of behaviour of a given soil under specified conditions. An attempt is made to extend the successful generalisation of compressibility of fine grained saturated soils using diffuse double layer theory to generalise shear strength behaviour. This indicates the possibility of a general and unique Cam clay model, which implies a constant value of M for any soil. The constancy of M is substantiated from basic considerations, and reasons for deviations from this value in practice discussed. Generalisation will increase practical applicability of the Cam clay model.
886057 Pressuremeter test and disturbance effects. Technical note Sayed, S M; Hamed, M A J Geotech Engng Div ASCE V114, N5, May 1988, P631-637 Disturbance associated with placement of the probe in the pressuremeter test and remoulding at the cavity-soil interface is particularly serious for cohesionless soils and very sensitive clays. An extensive parametric study of test data has allowed development of charts for direct assessment of the effect of the remoulded annulus on deformation characteristics obtained for unsaturated soils in the drained or undrained state. Disturbance index is a function of degree of remoulding, size of remoulded annulus, and Poisson’s ratio.
886058 Deformation phenomena in jointed rock Barton, N R Norw Geotech Inst Pub1 N168. 1987, 21P The role of rock joints in rock mass deformation phenomena is discussed. Deformation modes, effect of jointing on stress slabbing, effect of jointing on stress contrasts, joint aperture and conductivity phenomena, compaction and depletion phenomena in jointed reservoirs, hydraulic shearing phenomena, modelling shear, dilation and conductivity coupling, coupled phenomena during seismic loading, stress transformation with dilation, and joint deformation around underground openings are considered. 0
A series of laboratory tests on artificially mixed soils showed that undrained shear strength anisotropy increased with decreased plasticity index. To verify this relationship, the same consolidated undrained triaxial extension and compression tests were conducted on 8 types of remoulded marine clays. Results show a relationship between shear strength characteristics and plasticity index almost identical to that of the artificially mixed soils, and that the angle of shearing resistance and pore pressure coefficient at failure are in an almost linear relation with plasticity index.
fU36061 Effects of initial anisotropic fabric and intermediate principal stress on strength and deformation characteristics of sand Lam, W K; Tatsuoka, F Soils Found V28. Nl, March 1988, P89-106 A series of drained shear tests was undertaken to study the strength and deformation characteristics of air-pluviated sand. Samples were subjected to triaxial compression, plane strain compression and triaxial extension tests in a conventional triaxial cell. The results show that initial anisotropy had a significant effect on strength and deformation of all specimens, and that strength in triaxial extension was strongly influenced by failure modes. Also, the angle of internal friction of airpluviated sand was found to be a function of principal stresses with respect to material axes and failure mode.
886062 Windsor test - new method of measuring rock or soil strength Ladeira, F L Proc CARE 88 (Conference on Applied Rock Engineering), Newcastle, 6-8 January 1988 P127-131. Pub1 London: IMM, 1988 In the Windsor Test to measure compressive strength, a probe is fired into the rock or soil and the penetration depth measured. The penetration depth is a function of impact energy, lithology and rock fabric. Results on several rock types show the test to be accurate for rocks with a compressive strength less than lOOMPa and that the relation between penetration depth and strength is linear on a log-log scale.
1988 Pergamon Press plc. Reproduction
not permitted
886059 Compression of two dimensional model granular materials (In French) Travers, T; Ammi, M; Bideau, D; Gervois, A; Lemaitre, J; Messager, J C; Troadec, J P Rev Fr Geotech N43, 1988, P21-34
Foundation design problems related to undrained cyclic loading of clay soils are briefly reviewed. Stress conditions beneath a gravity structure are examined. A laboratory testing program to obtain necessary soil data for analysis of the problem is described. Results from undrained cyclic triaxial and direct simple shear tests on Drammen clay are presented. These data provide general knowledge about soil behaviour under cyclic loading and form the basis of a database to be used in determining soil parameters for early feasibility studies of gravity structures, designing test programs, and development of theoretical models.
Experiments carried out on a matrix of horizontal cylindrical rods under confined vertical compression are reported. Influences due to packing geometry and the effects of mixing hard and soft grains were examined. Two distinct regimes were evident, one of consolidation, the other post consolidation. Power law stress strain relations held in both cases. Effects of equipment walls and the size of the matrix of rods were also investigated. Results were often supported by photoelastic observations.
886056 Can Cam-clay model be generalized? Srinivasa Murthy, B R; Vatsala, A; Nagaraj, T S J Geotech Engng Div ASCE Vl14, N5. May 1988, P601-613
Undrained shear strength of remoulded marine clays Nakase, A; Kamei, T Soils Found V28, Nl, March 1988, P29-40
The Cam clay model, based on critical state concepts fitted into the theory of plasticity, requires determination of four parameters to enable prediction of behaviour of a given soil under specified conditions. An attempt is made to extend the successful generalisation of compressibility of fine grained saturated soils using diffuse double layer theory to generalise shear strength behaviour. This indicates the possibility of a general and unique Cam clay model, which implies a constant value of M for any soil. The constancy of M is substantiated from basic considerations, and reasons for deviations from this value in practice discussed. Generalisation will increase practical applicability of the Cam clay model.
886057 Pressuremeter test and disturbance effects. Technical note Sayed, S M; Hamed, M A J Geotech Engng Div ASCE V114, N5, May 1988, P631-637 Disturbance associated with placement of the probe in the pressuremeter test and remoulding at the cavity-soil interface is particularly serious for cohesionless soils and very sensitive clays. An extensive parametric study of test data has allowed development of charts for direct assessment of the effect of the remoulded annulus on deformation characteristics obtained for unsaturated soils in the drained or undrained state. Disturbance index is a function of degree of remoulding, size of remoulded annulus, and Poisson’s ratio.
886058 Deformation phenomena in jointed rock Barton, N R Norw Geotech Inst Pub1 N168. 1987, 21P The role of rock joints in rock mass deformation phenomena is discussed. Deformation modes, effect of jointing on stress slabbing, effect of jointing on stress contrasts, joint aperture and conductivity phenomena, compaction and depletion phenomena in jointed reservoirs, hydraulic shearing phenomena, modelling shear, dilation and conductivity coupling, coupled phenomena during seismic loading, stress transformation with dilation, and joint deformation around underground openings are considered. 0
A series of laboratory tests on artificially mixed soils showed that undrained shear strength anisotropy increased with decreased plasticity index. To verify this relationship, the same consolidated undrained triaxial extension and compression tests were conducted on 8 types of remoulded marine clays. Results show a relationship between shear strength characteristics and plasticity index almost identical to that of the artificially mixed soils, and that the angle of shearing resistance and pore pressure coefficient at failure are in an almost linear relation with plasticity index.
fU36061 Effects of initial anisotropic fabric and intermediate principal stress on strength and deformation characteristics of sand Lam, W K; Tatsuoka, F Soils Found V28. Nl, March 1988, P89-106 A series of drained shear tests was undertaken to study the strength and deformation characteristics of air-pluviated sand. Samples were subjected to triaxial compression, plane strain compression and triaxial extension tests in a conventional triaxial cell. The results show that initial anisotropy had a significant effect on strength and deformation of all specimens, and that strength in triaxial extension was strongly influenced by failure modes. Also, the angle of internal friction of airpluviated sand was found to be a function of principal stresses with respect to material axes and failure mode.
886062 Windsor test - new method of measuring rock or soil strength Ladeira, F L Proc CARE 88 (Conference on Applied Rock Engineering), Newcastle, 6-8 January 1988 P127-131. Pub1 London: IMM, 1988 In the Windsor Test to measure compressive strength, a probe is fired into the rock or soil and the penetration depth measured. The penetration depth is a function of impact energy, lithology and rock fabric. Results on several rock types show the test to be accurate for rocks with a compressive strength less than lOOMPa and that the relation between penetration depth and strength is linear on a log-log scale.
1988 Pergamon Press plc. Reproduction
not permitted