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Comparison of methods of predicting foundation settlement on sand and gravel
241A consolidation and swelling properties. The soil exhibits swelling properties, especially in the upper 2m. Swelling decreases with increased moisture content, with the water table at 2.5m. Implications for foundation design are discussed. 895100 Experiences with expansive soils in Saudi Arabia Ruwaih, I A Proc 6th International Conference on Expansive Soils, New DelM, 1-4 December 1987 P317-322. Publ Rotterdam: A A Balkema. 1988
895104 Consolidation analysis based on elasto-viscoplasticity by finite element method Ogisako, E; Nishizaki, S; Dewa, K; Saito, I Proc Ninth Southeast Asian Geoteclmical Conference, Bangkok, 7-11 December 1987 VI. P4.53-4.64. Publ Bangkok: Southeast Asian Geotechnical Society. 1987
Expansive soils and their distribution in Saudi Arabia are described. The soils may be divided into 3 types, calcareous clay, montmorillonite clay and weathered shale. Damage to buildings constructed on expansive soils is described. This has been due mainly to heave, not shrinkage.
Finite element consolidation analyses of an embankment foundation on clay were performed using eight different constitutive models, including elastoplastic and viscoelastoplastic models. Results are compared with field measurements. Eiastoviscoplastic models allow time dependent features to be adequately expressed. An anisotropy model allows stress induced anisotropy effects to be described. Two dimensional analysis with an elastoviscoplastic constitutive law is considered to give adequate accuracy for design purposes if suitable soil parameters are adopted.
895101 Construction and maintenance problems on expansive soils Lamar, J H; Laier, J E Proc 6th International Conference on Expansive Soils, New Delhi, 1-4 December 1987 P323-326. Publ Rotterdam: A A Baikema. 1988
895105 Influence of consolidation duration on shear characteristics of organic soils Tsushima, M; Mitachi, T Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI. P4.65-4.72. Publ Bangkok: Southeast Asian Geotechnical Society. 1987
Experience with construction on outlined. Vertical soil movements site grading cause problems and non-expansive soils to minimise deep, drilled pier foundations.
the expansive yazoo clays is and areal movements during can be overcome by use of swelling and excavation of
895102 Considerations of soil shrinkage in designing clay liners for municipal solid waste landfills Hcttiaratchi, J P A: Hrudey, S E Proc Ninth Southeast Asian Geotecimical Conference, Bangkok, 7-11 December 1987 VI. P3.121-3.136. Publ Bangkok: Southeast Asian Geotechnical Society. 1987
Use of hydraulic conductivity of soil material as the sole basis for sanitary landfill liner design is reviewed. A synaerisis shrinkage test (SST) to study the soil shrinkage caused by municipal solid waste (MSW) leachates is introduced. Leachates cause soil shrinkage by reducing interparticle repulsive stresses, thereby increasing effective stress. The effective stress concept and double layer theory adequately describe the synaerisis shrinkage phenomenon. Based on the results obtained, a new approach to landfill liner design is proposed. The SST, which supplies information on both volume shrinkage and permeability changes caused by leachate, provides the basic laboratory data required. Auth. 895103 Comparison of methods of predicting foundation settlement on sand and gravel Maail, S Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI. P4.13-4.24. Publ Bangkok: Southeast Asian Geotechnical Society, 1987
Accuracy of methods to determine settlement of sands and gravels was studied. 19 case studies were used to analyse 9 methods based on standard penetration tests and 4 methods based on cone penetration tests, comparing ratio of predicted to observed settlement. The method with average ratio closest to unity was considered most accurate. For CPT data,Schmertmann (1977) was most accurate and for SPT, Meyerhof (1965).
The influence of consolidation time on the angle of sheafing resistance and the stress-strain-dilatancy behaviour of peat has been investigated. Using a series of consolidated undrained triaxial tests, it has been found that the shear stress-strain curves are greatly influenced by the time of consolidation, and the undrained shear strength increases with the increase in organic matter content of the specimen for the same consolidation period. It has also been found that the effective angle of shearing resistance and dilatancy coefficient of peat are affected by the time of consolidation, and both parameters are closely related to each other. Auth.
Dynamic properties 895106 Permeability and borehole Stoneley waves: comparison between experiment and theory Winkler, K W; Liu, H L; Johnson, J L Geophysics V54. Ni, Jan 1989. P66-75
A technique has been developed to measure Stoneley wave attenuation and dispersion under controlled laboratory conditions. Silicone oil saturated samples of Berea sandstone and cemented glass beads were used. Results were analysed using Blot theory and Deresiewicz-Skalak boundary conditions. Experiment and theory agreed well over a range of frequencies. Velocity and attenuation are frequency dependent. Results support recent oilfield observations suggesting Stoneley wave velocity and attenuation may be indicative of formation permeability. 895107 P-wave attenuation measurements from laboratory resonance and sonic waveform data Goldberg. D; Zinszner, B Geophysics V54, Ni, Jan 1989, P76-81
P wave velocity and attenuation in the sonic frequency range were calculated from sonic log waveforms from a dolomitic reservoir and measured in the laboratory on cores of the same material, using a resonant bar technique. Laboratory and field velocity values were generally in good agreement when corrected for overburden pressure. Lower laboratory values were found in higher porosity samples. Field values of attenuation
~ 1989 Pergamon Press plc. Reproduction not permitted
895104 Consolidation analysis based on elasto-viscoplasticity by finite element method Ogisako, E; Nishizaki, S; Dewa, K; Saito, I Proc Ninth Southeast Asian Geoteclmical Conference, Bangkok, 7-11 December 1987 VI. P4.53-4.64. Publ Bangkok: Southeast Asian Geotechnical Society. 1987
Expansive soils and their distribution in Saudi Arabia are described. The soils may be divided into 3 types, calcareous clay, montmorillonite clay and weathered shale. Damage to buildings constructed on expansive soils is described. This has been due mainly to heave, not shrinkage.
Finite element consolidation analyses of an embankment foundation on clay were performed using eight different constitutive models, including elastoplastic and viscoelastoplastic models. Results are compared with field measurements. Eiastoviscoplastic models allow time dependent features to be adequately expressed. An anisotropy model allows stress induced anisotropy effects to be described. Two dimensional analysis with an elastoviscoplastic constitutive law is considered to give adequate accuracy for design purposes if suitable soil parameters are adopted.
895101 Construction and maintenance problems on expansive soils Lamar, J H; Laier, J E Proc 6th International Conference on Expansive Soils, New Delhi, 1-4 December 1987 P323-326. Publ Rotterdam: A A Baikema. 1988
895105 Influence of consolidation duration on shear characteristics of organic soils Tsushima, M; Mitachi, T Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI. P4.65-4.72. Publ Bangkok: Southeast Asian Geotechnical Society. 1987
Experience with construction on outlined. Vertical soil movements site grading cause problems and non-expansive soils to minimise deep, drilled pier foundations.
the expansive yazoo clays is and areal movements during can be overcome by use of swelling and excavation of
895102 Considerations of soil shrinkage in designing clay liners for municipal solid waste landfills Hcttiaratchi, J P A: Hrudey, S E Proc Ninth Southeast Asian Geotecimical Conference, Bangkok, 7-11 December 1987 VI. P3.121-3.136. Publ Bangkok: Southeast Asian Geotechnical Society. 1987
Use of hydraulic conductivity of soil material as the sole basis for sanitary landfill liner design is reviewed. A synaerisis shrinkage test (SST) to study the soil shrinkage caused by municipal solid waste (MSW) leachates is introduced. Leachates cause soil shrinkage by reducing interparticle repulsive stresses, thereby increasing effective stress. The effective stress concept and double layer theory adequately describe the synaerisis shrinkage phenomenon. Based on the results obtained, a new approach to landfill liner design is proposed. The SST, which supplies information on both volume shrinkage and permeability changes caused by leachate, provides the basic laboratory data required. Auth. 895103 Comparison of methods of predicting foundation settlement on sand and gravel Maail, S Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI. P4.13-4.24. Publ Bangkok: Southeast Asian Geotechnical Society, 1987
Accuracy of methods to determine settlement of sands and gravels was studied. 19 case studies were used to analyse 9 methods based on standard penetration tests and 4 methods based on cone penetration tests, comparing ratio of predicted to observed settlement. The method with average ratio closest to unity was considered most accurate. For CPT data,Schmertmann (1977) was most accurate and for SPT, Meyerhof (1965).
The influence of consolidation time on the angle of sheafing resistance and the stress-strain-dilatancy behaviour of peat has been investigated. Using a series of consolidated undrained triaxial tests, it has been found that the shear stress-strain curves are greatly influenced by the time of consolidation, and the undrained shear strength increases with the increase in organic matter content of the specimen for the same consolidation period. It has also been found that the effective angle of shearing resistance and dilatancy coefficient of peat are affected by the time of consolidation, and both parameters are closely related to each other. Auth.
Dynamic properties 895106 Permeability and borehole Stoneley waves: comparison between experiment and theory Winkler, K W; Liu, H L; Johnson, J L Geophysics V54. Ni, Jan 1989. P66-75
A technique has been developed to measure Stoneley wave attenuation and dispersion under controlled laboratory conditions. Silicone oil saturated samples of Berea sandstone and cemented glass beads were used. Results were analysed using Blot theory and Deresiewicz-Skalak boundary conditions. Experiment and theory agreed well over a range of frequencies. Velocity and attenuation are frequency dependent. Results support recent oilfield observations suggesting Stoneley wave velocity and attenuation may be indicative of formation permeability. 895107 P-wave attenuation measurements from laboratory resonance and sonic waveform data Goldberg. D; Zinszner, B Geophysics V54, Ni, Jan 1989, P76-81
P wave velocity and attenuation in the sonic frequency range were calculated from sonic log waveforms from a dolomitic reservoir and measured in the laboratory on cores of the same material, using a resonant bar technique. Laboratory and field velocity values were generally in good agreement when corrected for overburden pressure. Lower laboratory values were found in higher porosity samples. Field values of attenuation
~ 1989 Pergamon Press plc. Reproduction not permitted