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Automatic triaxial oedometer device
344A 906172 Use of penetration tests to predict wick drain performance in a soft clay Lutenegger, A J; Kabir, M G; Saye, S R Proc 1st International Symposium on Penetration Testing, ISOPT-1, Orlando,20-24 March 1988 V2, P843-848. Publ Rotterdam: A A Balkema, 1988 The use of prefabricated wick drains to accelerate the consolidation rate of soft clays under embankments is common in foundation engineering practice. The use of dissipation data from piezocone and flat-plate piezobtade tests to predict the performance of wick drains is described. Comparison of these results with predictions made from laboratory oedometer tests on undisturbed samples, oriented in both vertical and horizontal directions to obtain consolidation anisotropy, are presented.
906173 The applicability of penetration testing for determining the collapsibility of loess soils Milevski, D N Proc 1st International Symposium on Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 V2, P865-868. Publ Rotterdam: A A Balkema, 1988 Successful construction in loess soils requires knowledge of subgrade deformability and particularly of the collapsibility of loess soils on wetting. Studies were carried out to assess catastrophic deformation of loess soils when their water contents are raised above a specific critical value under a state of stress. The inability of penetration tests alone to characterize collapsibility and the effectiveness of combining penetration tests with borehole logging are discussed.
906174 Mathematical models for saturated expansive soils with and without CNS Katti, R K; Moza, K K; Katti, D R Proc Symposium on Environmental Geotechnics and Problematic Soils and Rocks, Bangkok, December 1985 P495513. Publ Rotterdam: A A Balkema, 1988 Montmorillonitic, expansive Black Cotton soils cover around one third of the surface of India. Their swelling properties lead to many structural problems. Large scale field tests and laboratory tests were carried out to characterise pressure developments within these soils. A gravitational component and one related to the mineralogy and interactions with the pore fluids were found. Interactions between parameters including swelling pressures of individual particles, cohesion, pore and particle sizes, and compressibility are evaluated. A theoretical model to explain the behaviour is developed.
906176 Consolidation in clays due to cyclic stresses Ansal, A M; Tuncan, M Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 V1, P3-6. Publ Rotterdam." A A Balkema, 1989 Clay samples consolidated to a specific axial stress ratio were subject to undrained cyclic shear tests. Cyclic loading may lead to additional settlements due to excess pore pressure dissipation for normally consolidated clays, but for overconsolidated clays, where excess pore pressure buildup is relatively small, this effect is negligible. Settlement magnitude had a semilogarithmic relation with both number of cycles and cyclic shear stress amplitude.
906177 Consolidation of Mexico City clay under repeated loading Diaz-Rodriguez, J A; Leyte-Guerrero, F Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 V1, P33-37. Publ Rotterdam: A A Balkema, 1989 To improve interpretation of soil behaviour under seismic loading, static and repeated load oedometer tests were carried out on undisturbed samples of Mexico City clay. The soil was more compressible under repeated loading conditions, especially at stress ratios close to or above unity. The soil showed elastic behaviour, despite its high water content. Some re-orientation of particles, equivalent to partial remoulding, occurred on repeated loading.
906178 Unified theory of one-dimensional consolidation with creep Imai, G Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 VI, P57-60. Publ Rotterdam." A A Balkema, 1989 Interpretations of one dimensional consolidation of soil vary with respect to effects of sample thickness and creep during primary consolidation. These problems are examined. The rule of mass conservation is theoretically examined to derive the correct equation. Experimental results are presented which demonstrate creep acts at all stages, and a set of equations including this effect is constructed. Effects of sample thickness and of secondary compression before consolidation loading are also examined.
906175 Influence of initial water content and soaking on compressibility and shear strength of decomposed granite soil Onitsuka, K; Yoshitake, S Proc Symposium on Environmental Geoteclmics and Problematic Soils and Rocks, Bangkok, December 1985 P545553. Publ Rotterdam: A A Balkema, 1988
906179 Automatic triaxini oedometer device Kolisoja, P; Sahi, K; Hartikainen, J Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 V1, P61-64. Publ Rotterdam." A A Balkema, 1989
Granitic residual soils are widespread in Japan. Natural and cut slopes are stable when dry, but liable to failure when wetted by rainfall. Compressibility, mechanisms and magnitude of settlement on soaking, shear characteristics and influence of water content and soaking, and relation between shear strength and dilatancy have been clarified for decomposed granite soils from seven sites on Kyushu.
New automated apparatus is described which can run oedometer tests with constant pressure ratio, strain rate, and incremental loading, in addition to consolidated drained or undrained triaxial tests. It is quick and simple to use, and test performance can be monitored and results output graphically. Its accuracy is assessed on the basis of comparison of results from previous work with output of the device.
© 1990 Pergamon Press plc. Reproduction not permitted
906173 The applicability of penetration testing for determining the collapsibility of loess soils Milevski, D N Proc 1st International Symposium on Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 V2, P865-868. Publ Rotterdam: A A Balkema, 1988 Successful construction in loess soils requires knowledge of subgrade deformability and particularly of the collapsibility of loess soils on wetting. Studies were carried out to assess catastrophic deformation of loess soils when their water contents are raised above a specific critical value under a state of stress. The inability of penetration tests alone to characterize collapsibility and the effectiveness of combining penetration tests with borehole logging are discussed.
906174 Mathematical models for saturated expansive soils with and without CNS Katti, R K; Moza, K K; Katti, D R Proc Symposium on Environmental Geotechnics and Problematic Soils and Rocks, Bangkok, December 1985 P495513. Publ Rotterdam: A A Balkema, 1988 Montmorillonitic, expansive Black Cotton soils cover around one third of the surface of India. Their swelling properties lead to many structural problems. Large scale field tests and laboratory tests were carried out to characterise pressure developments within these soils. A gravitational component and one related to the mineralogy and interactions with the pore fluids were found. Interactions between parameters including swelling pressures of individual particles, cohesion, pore and particle sizes, and compressibility are evaluated. A theoretical model to explain the behaviour is developed.
906176 Consolidation in clays due to cyclic stresses Ansal, A M; Tuncan, M Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 V1, P3-6. Publ Rotterdam." A A Balkema, 1989 Clay samples consolidated to a specific axial stress ratio were subject to undrained cyclic shear tests. Cyclic loading may lead to additional settlements due to excess pore pressure dissipation for normally consolidated clays, but for overconsolidated clays, where excess pore pressure buildup is relatively small, this effect is negligible. Settlement magnitude had a semilogarithmic relation with both number of cycles and cyclic shear stress amplitude.
906177 Consolidation of Mexico City clay under repeated loading Diaz-Rodriguez, J A; Leyte-Guerrero, F Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 V1, P33-37. Publ Rotterdam: A A Balkema, 1989 To improve interpretation of soil behaviour under seismic loading, static and repeated load oedometer tests were carried out on undisturbed samples of Mexico City clay. The soil was more compressible under repeated loading conditions, especially at stress ratios close to or above unity. The soil showed elastic behaviour, despite its high water content. Some re-orientation of particles, equivalent to partial remoulding, occurred on repeated loading.
906178 Unified theory of one-dimensional consolidation with creep Imai, G Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 VI, P57-60. Publ Rotterdam." A A Balkema, 1989 Interpretations of one dimensional consolidation of soil vary with respect to effects of sample thickness and creep during primary consolidation. These problems are examined. The rule of mass conservation is theoretically examined to derive the correct equation. Experimental results are presented which demonstrate creep acts at all stages, and a set of equations including this effect is constructed. Effects of sample thickness and of secondary compression before consolidation loading are also examined.
906175 Influence of initial water content and soaking on compressibility and shear strength of decomposed granite soil Onitsuka, K; Yoshitake, S Proc Symposium on Environmental Geoteclmics and Problematic Soils and Rocks, Bangkok, December 1985 P545553. Publ Rotterdam: A A Balkema, 1988
906179 Automatic triaxini oedometer device Kolisoja, P; Sahi, K; Hartikainen, J Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 V1, P61-64. Publ Rotterdam." A A Balkema, 1989
Granitic residual soils are widespread in Japan. Natural and cut slopes are stable when dry, but liable to failure when wetted by rainfall. Compressibility, mechanisms and magnitude of settlement on soaking, shear characteristics and influence of water content and soaking, and relation between shear strength and dilatancy have been clarified for decomposed granite soils from seven sites on Kyushu.
New automated apparatus is described which can run oedometer tests with constant pressure ratio, strain rate, and incremental loading, in addition to consolidated drained or undrained triaxial tests. It is quick and simple to use, and test performance can be monitored and results output graphically. Its accuracy is assessed on the basis of comparison of results from previous work with output of the device.
© 1990 Pergamon Press plc. Reproduction not permitted