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Wave and earthquake induced liquefaction potential of silty sand from sea bed
27A 911209 Wave and earthquake induced liquefaction potential of silty sand from sea bed Dhat, N R; Chhatre, M V; Vaidya, A M; Murlidhar, B; Paliwal, S T; Mokhashi, S L Proc International Symposium o n Modelling SoU-WaterStructure Interactions, Delft, 29 August-2 September 1988 P77-83. Publ Rotterdam: A A Balkema, 1988
Liquefaction potential of a silty seabed sand was estimated using a simplified approach based on an empirical method (Seed, 1971), using the dynamic finite element code Quad-IV (Seed, 1973), and using cyclic triaxiai tests. The simplified approach suggested a critical acceleration for liquefaction of 0.13g, the other approaches gave 0.24g. In all cases, wave heights of 7m would be insufficient to induce liquefaction.
Identification and classification See also: 911431 911210 Inadequacy of the classification of coarse-grained soils. Technical note Sivakugan, N Geotech Test J VI3, N2, June 1990, P134-137
The basis of the unified soil classification system (USCS) for coarse grained soils, depending only on 3 points on the grain size distribution curve, is examined and some shortcomings highlighted. The concept of density function of grain size is introduced, whose plot gives a more realistic representation of grain size distribution and picture of the relative qualities of all grain sizes. 911211 Soil classification method using all three components of CPTU data Tsuchiya, H; Muromachi, T; Sakai, Y; Iwasaki, K Proc Ist International Symposium on Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 V2, P1021-1026. Publ Rotterdam: A A Balkema, 1988
A new method for soil classification has been developed based on the cone penetration test with pore water pressure measurement. In this method, cone point resistance, sleeve friction, and pore water pressure are displayed graphically using a three dimensional Cartesian coordinate system. Comparison of the results obtained by applying this method to alluvial soils and those obtained by boring logs near the CPTU test locations is presented. Details of the classification method are also discussed. 911212 Engineering classification and building behaviour of red clay Gao, D Proc International Conference on Engineering Problems of Regional Soils, Beijing, 11-15 August 1988 P589-591. Publ Beijing: International Academic Publishers, 1989
In Situ Stress Causes and nature of in situ stress 911213 Smoothing and extrapolation of crustal stress orientation measurements
Hansen, K M; Mount, V S J Geophys Res V95, NB2, Feb 1990. P1155-1165 A statistical smoothing algorithm for estimating stress fields based on observed data is presented. It allows adjustment of smoothness and fidelity of the stress field and quality weighting of individual data points. Stress fields can be displayed as gridded maps or stress trajectory maps. Stress fields for California and western Canada are estimated using borehole elongation data, and the paleostress field for the Spanish Peaks intrusion in Colorado is estimated from vertical dyke orientation. The algorithm may be applied to other geotechnical data sets. 911214 Particularities of rock massif current stress state in conditions of complicated geological structures on measurement data base Kazikaev, J M; Fomin, B A; Zhourin, S N Proc International Symposium on Rock at Great Depth, Pau, 28-31 August 1989 I/2, PIOIl-IOI5. Publ Rotterdam: A A Balkema, 1989
Mining of mineral resources in rocks with complex miningengineering and hydrogeological conditions at large depths continues to present technological difficulties. One of the most important problems is the natural stress state of the rocks. Stress measurements from many areas of complex geology have been collected. A hypothesis to explain the development of the in situ stress fields in these cases is proposed. 911215 Stress orientation profile in the Cajou Pass, California, scientific drillhole based on detailed analysis of stress induced borehole breakouts Shamir, G; Zoback, M D Proc International Symposium on Rock at Great Depth, Pau, 28-31 August 1989 V2, P1041-1048. Publ Rotterdam: A A Balkema, 1989
Based on stress-induced wellbore breakouts examined with an ultrasonic borehole televiewer, a detailed profile of the direction of the maximum horizontal compressive stress from 1.75 to 3.5km depth in the Cajon Pass scientific drillhole is presented. The overall average horizontal compressive stress, oriented N57E resolves on to planes parallel to the San Andreas fault, with a small shear stress, whose left lateral sense is inconsistent with the slip history of the fault. Local perturbations in the stress field indicated by highly abundant breakouts are due to the borehole interaction with fractures and faults.
Red clays, chiefly found in southern China, vary greatly in terms of origin and properties. Engineering classification is described, taking into account origin and its influence on mineralogical and microstructural features, shrinkage, expansion, and sensitivity to water, macrostuctural features such as fissuring, and foundation conditions beneath the clay layers. Based on the classification, recommendations are made for design of foundations on these soils. © 1991 Pergamon Press pie. Reproduction not permitted
Liquefaction potential of a silty seabed sand was estimated using a simplified approach based on an empirical method (Seed, 1971), using the dynamic finite element code Quad-IV (Seed, 1973), and using cyclic triaxiai tests. The simplified approach suggested a critical acceleration for liquefaction of 0.13g, the other approaches gave 0.24g. In all cases, wave heights of 7m would be insufficient to induce liquefaction.
Identification and classification See also: 911431 911210 Inadequacy of the classification of coarse-grained soils. Technical note Sivakugan, N Geotech Test J VI3, N2, June 1990, P134-137
The basis of the unified soil classification system (USCS) for coarse grained soils, depending only on 3 points on the grain size distribution curve, is examined and some shortcomings highlighted. The concept of density function of grain size is introduced, whose plot gives a more realistic representation of grain size distribution and picture of the relative qualities of all grain sizes. 911211 Soil classification method using all three components of CPTU data Tsuchiya, H; Muromachi, T; Sakai, Y; Iwasaki, K Proc Ist International Symposium on Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 V2, P1021-1026. Publ Rotterdam: A A Balkema, 1988
A new method for soil classification has been developed based on the cone penetration test with pore water pressure measurement. In this method, cone point resistance, sleeve friction, and pore water pressure are displayed graphically using a three dimensional Cartesian coordinate system. Comparison of the results obtained by applying this method to alluvial soils and those obtained by boring logs near the CPTU test locations is presented. Details of the classification method are also discussed. 911212 Engineering classification and building behaviour of red clay Gao, D Proc International Conference on Engineering Problems of Regional Soils, Beijing, 11-15 August 1988 P589-591. Publ Beijing: International Academic Publishers, 1989
In Situ Stress Causes and nature of in situ stress 911213 Smoothing and extrapolation of crustal stress orientation measurements
Hansen, K M; Mount, V S J Geophys Res V95, NB2, Feb 1990. P1155-1165 A statistical smoothing algorithm for estimating stress fields based on observed data is presented. It allows adjustment of smoothness and fidelity of the stress field and quality weighting of individual data points. Stress fields can be displayed as gridded maps or stress trajectory maps. Stress fields for California and western Canada are estimated using borehole elongation data, and the paleostress field for the Spanish Peaks intrusion in Colorado is estimated from vertical dyke orientation. The algorithm may be applied to other geotechnical data sets. 911214 Particularities of rock massif current stress state in conditions of complicated geological structures on measurement data base Kazikaev, J M; Fomin, B A; Zhourin, S N Proc International Symposium on Rock at Great Depth, Pau, 28-31 August 1989 I/2, PIOIl-IOI5. Publ Rotterdam: A A Balkema, 1989
Mining of mineral resources in rocks with complex miningengineering and hydrogeological conditions at large depths continues to present technological difficulties. One of the most important problems is the natural stress state of the rocks. Stress measurements from many areas of complex geology have been collected. A hypothesis to explain the development of the in situ stress fields in these cases is proposed. 911215 Stress orientation profile in the Cajou Pass, California, scientific drillhole based on detailed analysis of stress induced borehole breakouts Shamir, G; Zoback, M D Proc International Symposium on Rock at Great Depth, Pau, 28-31 August 1989 V2, P1041-1048. Publ Rotterdam: A A Balkema, 1989
Based on stress-induced wellbore breakouts examined with an ultrasonic borehole televiewer, a detailed profile of the direction of the maximum horizontal compressive stress from 1.75 to 3.5km depth in the Cajon Pass scientific drillhole is presented. The overall average horizontal compressive stress, oriented N57E resolves on to planes parallel to the San Andreas fault, with a small shear stress, whose left lateral sense is inconsistent with the slip history of the fault. Local perturbations in the stress field indicated by highly abundant breakouts are due to the borehole interaction with fractures and faults.
Red clays, chiefly found in southern China, vary greatly in terms of origin and properties. Engineering classification is described, taking into account origin and its influence on mineralogical and microstructural features, shrinkage, expansion, and sensitivity to water, macrostuctural features such as fissuring, and foundation conditions beneath the clay layers. Based on the classification, recommendations are made for design of foundations on these soils. © 1991 Pergamon Press pie. Reproduction not permitted