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Soil deformation properties evaluated from hydrogeological tests
346A strains are correlated with residual effective stress ratio. An empirical model is proposed to evaluate development of pore pressure and residual shear strain. 926053 Response of soft clays to cyclic loads Jagau, H; Gudehus, G Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, Pl15120. Publ Rotterdam." A A Balkema, 1991 Cyclic loads from vehicular or machine origins have led to unexpected settlement damage to buildings on shallow foundations in soft clays. Cyclic triaxial tests were carried out to examine the vibration-sensitivity of Konstanz lacustrine clay. Changes in soil stiffness on cycling, and effects of frequency, strain level, load, and pore pressure were evaluated. Safe cyclic loading limits to prevent vibration induced settlement are discussed.
926054 Variation of the modulus of deformation of unsaturated soils with suction Juca, J F T; Escario, V Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, P121124. Publ Rotterdam. A A Balkema, 1991 Deformability of a soil is a function of effective stress and therefore of suction. Penetration tests were carried out on compacted soil samples in a specially adapted oedometer cell with controlled suction. Two clay soils and a clayey sand were tested. Deformation modulus increased nonlinearly as suction was increased from zero to a maximum of 12MPa. Influence of sample compaction method and testing technique on results is discussed. 926055 Applications of the flat dilatometer test (DMT) in cohesive soils Kalteziotis, N A; Pachakis, M D; Zervogiannis, H S Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, P125128. Publ Rotterdam." A A Balkema, 1991 Flat dilatometer tests, pressuremeter tests (PMT), and crosshole seismic tests (CHT) were carried out at 6 cohesive soil sites in Greece. Correlations are presented between DMT parameters, initial liftoff and final corrected pressures and Young's modulus, and S wave velocity and shear modulus from the CHT and limit pressure and Young's modulus from the PMT. Application of the DMT to prediction of pile behaviour on the basis of these results is examined. 926056 Cyclic shear modulus of natural, marine clays Lango, H; Grande, L Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, Pl29132. Publ Rotterdam." A A Balkema, 1991 To improve our knowledge of variation of soil stiffness with stress and strain, time, and geological and loading history, a series of small strain amplitude, multistage triaxial tests was carried out on three NTH reference clays (normally consolidated, slightly overconsolidated, and stiff overconsolidated). A near linear correlation is seen between cyclic secant shear modulus and cyclic shear stress amplitude and mean effective stress level.
926057 Shear strength of shear surfaces under fast loading Lemos, L J L Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, P 137141. Publ Rotterdam. A A Balkema, 1991 Strength of shear surfaces of cohesive soils is known to be strain rate sensitive, and this must be considered when assessing seismic stability. Rapid shear rate ring shear tests were carried out on shear surfaces, preformed by slow shear, of a range of clay and till soils. Some showed ultimate fast strength greater then slow residual strength, others the reverse. The latter (negative) rate effect is thought to be an intrinsic soil property. Soils showing the negative effect can give fast failure with large displacement on earthquake excitation. 926058 Assessment of ground stiffness from field and laboratory tests Powell, J J; Butcher, A P Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V I . P153156. Publ Rotterdam: A A Balkema, 1991 Ground stiffness was measured at 6 sites, 2 of overconsolidated glacial clay tills, 3 of stiff heavily overconsotidated aged clays, and 1 of soft normally consolidated silty clay. Direct methods, large diameter plate loading tests, pressuremeter tests, and small strain triaxial tests, and indirect methods, based on measurement of velocity of S waves in the field and laboratory and of Rayleigh waves in the field, were used. Consistent patterns of normalised shear moduli at working strains were obtained for each site. The potential of the Rayleigh wave method to estimate stiffness is discussed. 926059 Soil deformation properties evaluated from hydrogeoiogical tests Schuldt, J; Foged, N Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V I, P159162. Publ Rotterdam." A A Balkema, 1991 The storage coefficient, S, of artesian aquifers is an expression of the elastic properties of the volume of aquifer affected by pumping, and is therefore directly related to compressibility of soil and rock as measured in geotechnical engineering. The theoretical background to this correspondence is presented. Data from pumping of artesian aquifers in Denmark are presented and inferred values of elasticity/compressibility are seen to be consistent with geotechnical measurements. Large scale descriptions of these properties may be obtained using pumping tests.
926060 Elastic properties of granular materials measured in the laboratory Shibuya, S; Tatsuoka, F; Teachavorasinskun, S~ Park, C S: Abe, F Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, P163166. Publ Rotterdam: A A Balkema, 1991 Triaxial plane strain compression and torsional simple shear tests, using monotonic and cyclic loading, were carried out on samples of a rounded gravel and rounded and angular to subangular sands. Elastic shear modulus was evaluated in the small strain (lt 0.001%) region, where the soil response was essentially linear elastic. Results indicate that for a given soil, Gmax was predominantly a function of density and current state of stress, and effectively independent of initial shear and type of shearing.
@ 1992 Pergamon Press Ltd. Reproduction not permitted
926054 Variation of the modulus of deformation of unsaturated soils with suction Juca, J F T; Escario, V Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, P121124. Publ Rotterdam. A A Balkema, 1991 Deformability of a soil is a function of effective stress and therefore of suction. Penetration tests were carried out on compacted soil samples in a specially adapted oedometer cell with controlled suction. Two clay soils and a clayey sand were tested. Deformation modulus increased nonlinearly as suction was increased from zero to a maximum of 12MPa. Influence of sample compaction method and testing technique on results is discussed. 926055 Applications of the flat dilatometer test (DMT) in cohesive soils Kalteziotis, N A; Pachakis, M D; Zervogiannis, H S Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, P125128. Publ Rotterdam." A A Balkema, 1991 Flat dilatometer tests, pressuremeter tests (PMT), and crosshole seismic tests (CHT) were carried out at 6 cohesive soil sites in Greece. Correlations are presented between DMT parameters, initial liftoff and final corrected pressures and Young's modulus, and S wave velocity and shear modulus from the CHT and limit pressure and Young's modulus from the PMT. Application of the DMT to prediction of pile behaviour on the basis of these results is examined. 926056 Cyclic shear modulus of natural, marine clays Lango, H; Grande, L Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, Pl29132. Publ Rotterdam." A A Balkema, 1991 To improve our knowledge of variation of soil stiffness with stress and strain, time, and geological and loading history, a series of small strain amplitude, multistage triaxial tests was carried out on three NTH reference clays (normally consolidated, slightly overconsolidated, and stiff overconsolidated). A near linear correlation is seen between cyclic secant shear modulus and cyclic shear stress amplitude and mean effective stress level.
926057 Shear strength of shear surfaces under fast loading Lemos, L J L Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, P 137141. Publ Rotterdam. A A Balkema, 1991 Strength of shear surfaces of cohesive soils is known to be strain rate sensitive, and this must be considered when assessing seismic stability. Rapid shear rate ring shear tests were carried out on shear surfaces, preformed by slow shear, of a range of clay and till soils. Some showed ultimate fast strength greater then slow residual strength, others the reverse. The latter (negative) rate effect is thought to be an intrinsic soil property. Soils showing the negative effect can give fast failure with large displacement on earthquake excitation. 926058 Assessment of ground stiffness from field and laboratory tests Powell, J J; Butcher, A P Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V I . P153156. Publ Rotterdam: A A Balkema, 1991 Ground stiffness was measured at 6 sites, 2 of overconsolidated glacial clay tills, 3 of stiff heavily overconsotidated aged clays, and 1 of soft normally consolidated silty clay. Direct methods, large diameter plate loading tests, pressuremeter tests, and small strain triaxial tests, and indirect methods, based on measurement of velocity of S waves in the field and laboratory and of Rayleigh waves in the field, were used. Consistent patterns of normalised shear moduli at working strains were obtained for each site. The potential of the Rayleigh wave method to estimate stiffness is discussed. 926059 Soil deformation properties evaluated from hydrogeoiogical tests Schuldt, J; Foged, N Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V I, P159162. Publ Rotterdam." A A Balkema, 1991 The storage coefficient, S, of artesian aquifers is an expression of the elastic properties of the volume of aquifer affected by pumping, and is therefore directly related to compressibility of soil and rock as measured in geotechnical engineering. The theoretical background to this correspondence is presented. Data from pumping of artesian aquifers in Denmark are presented and inferred values of elasticity/compressibility are seen to be consistent with geotechnical measurements. Large scale descriptions of these properties may be obtained using pumping tests.
926060 Elastic properties of granular materials measured in the laboratory Shibuya, S; Tatsuoka, F; Teachavorasinskun, S~ Park, C S: Abe, F Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, P163166. Publ Rotterdam: A A Balkema, 1991 Triaxial plane strain compression and torsional simple shear tests, using monotonic and cyclic loading, were carried out on samples of a rounded gravel and rounded and angular to subangular sands. Elastic shear modulus was evaluated in the small strain (lt 0.001%) region, where the soil response was essentially linear elastic. Results indicate that for a given soil, Gmax was predominantly a function of density and current state of stress, and effectively independent of initial shear and type of shearing.
@ 1992 Pergamon Press Ltd. Reproduction not permitted