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Problems of red coffee soils in Kenya
116A and the applicability of SPT for settlement prediction are considered. Results from tests carried out above the water table (dry tests) are significantly different from those below or in close proximity (wet tests), and only the dry tests gave the high resistance expected from dense and strongly geologically aged sands. Results of wet tests may be more indicative of test conditions than actual foundation performance of undisturbed sands.
893073 Lamination phenomena in prestressed rock Muhlhaus, H B
Proc 2nd International Symposium of Rockbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P117-12 7. Publ Minneapolis: University of Minnesota, 1988 A simple strain softening model for brittle rock is derived within the framework of Cosserat theory, in which material parameters with dimensions of length (eg grain diameter) enter the constitutive equations. This allows prediction of the thickness of shell and slab like structures which form during exfoliation processes. Using this model, the problem of surface buckling of a semi infinite strip in compression is solved by the finite element method, and the role of tensile stresses occurring in the post buckling range in exfoliation is investigated. Auth.
893074 Effect of confining pressure on Israeli calcareous sands Frydman, S
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 V1, P167-171. Publ Japan." Japanese Society for Soil Mechanics and Foumtation Engineering. 1987 Two calcareous sands (kurkar) of different dry densities and cementation were tested. Drained static and cyclic triaxial tests were carried out on saturated cores under confining pressure 50-1400 kPa. Static and dynamic strength parameters fell as confining pressures increased, but the effect on rigidity of the two materials was different, due to differences in form of cementation. Results are discussed considering geotechnical implications, such as influence on bearing capacity of piles.
893076 Stress-strain idealization for Bombay High calcareous soils Golait, Y S: Katti. R K
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 VI,
P177-I80. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering. 1987 Experimentally observed behaviour from 160 triaxial tests on 13 selected Bombay High clay and sandy soils has been analysed. An idealised hyperbolic constitutive model is developed, with four nondimensional parameters defining soil behaviour. Relations between these parameters and carbonate content are examined for offshore loading conditions, to assist in predicting behaviour under a given confining pressure of soil of known carbonate content.
893077 Geotechnical properties of weathered joints of decomposed granite Kamon, M
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 VI,
P181-184. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering. 1987 Rainfall induced slope failures in residual soils can be classified as erosive or jointed. Undisturbed homogeneous and jointed samples of decomposed biotite granite were taken using the method of Aoyama et al (1983). Shear strengths of intact homogeneous and jointed samples, and joint shear strength were measured in the saturated and unsaturated states. Saturation greatly reduces the shearing resistance of jointed residual soil masses. Results are discussed considering implications for slope stability.
893078 Mechanical properties of undisturbed decomposed granite soils Murata, H; Yasufuku, N
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 VI, P193-196. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering, 1987 Isotropic compression and triaxial shear tests were conducted on undisturbed granitic residual soils with various degrees of weathering. Samples were taken using the core bit described by Murata et al (1985). Influences of degree of weathering on mechanical properties and of disturbance on stress strain relations were investigated. Saturation was seen to significantly affect soil strength. Modified ignition loss was used as an index of degree of weathering.
893075 Problems of Red Coffee soils in Kenya Gichaga, F J; Sahu, B K; Visweswaraiya, T G; Atibu, F S
893079 Effect of drying and wetting on mechanical behavior of mudstone Shinjo, T; Komiya, Y
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 V1,
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 V1,
P173-176. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering, 1987
P209-212. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering, 1987
Geotechnical properties of Red Coffee soils from 12 sites were determined. Abnormal properties are explained in terms of the clay fraction occurring as clusters of hard porous grains, and the major clay mineral occurring in 2 forms, halloysite and metahalloysite, with different engineering properties. Problems likely to arise if Red Coffee soils are used as foundation or construction materials, due to plasticity,cohesion, or cracking being different from that expected, are discussed.
Consolidated drained triaxial tests were performed on unweathered mudstones and intact mudstones weathered by wet-dry cycling. Deformation behaviour was analysed in terms of cross-anisotropy elastic theory, and five independent parameters are obtained. The failure criterion is determined as a power relationship. Weathering by wetting and drying has significant influence on the strength and deformation properties of mudstones.
1989 Pergamon Press pie. Reproduction not permitted
893073 Lamination phenomena in prestressed rock Muhlhaus, H B
Proc 2nd International Symposium of Rockbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P117-12 7. Publ Minneapolis: University of Minnesota, 1988 A simple strain softening model for brittle rock is derived within the framework of Cosserat theory, in which material parameters with dimensions of length (eg grain diameter) enter the constitutive equations. This allows prediction of the thickness of shell and slab like structures which form during exfoliation processes. Using this model, the problem of surface buckling of a semi infinite strip in compression is solved by the finite element method, and the role of tensile stresses occurring in the post buckling range in exfoliation is investigated. Auth.
893074 Effect of confining pressure on Israeli calcareous sands Frydman, S
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 V1, P167-171. Publ Japan." Japanese Society for Soil Mechanics and Foumtation Engineering. 1987 Two calcareous sands (kurkar) of different dry densities and cementation were tested. Drained static and cyclic triaxial tests were carried out on saturated cores under confining pressure 50-1400 kPa. Static and dynamic strength parameters fell as confining pressures increased, but the effect on rigidity of the two materials was different, due to differences in form of cementation. Results are discussed considering geotechnical implications, such as influence on bearing capacity of piles.
893076 Stress-strain idealization for Bombay High calcareous soils Golait, Y S: Katti. R K
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 VI,
P177-I80. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering. 1987 Experimentally observed behaviour from 160 triaxial tests on 13 selected Bombay High clay and sandy soils has been analysed. An idealised hyperbolic constitutive model is developed, with four nondimensional parameters defining soil behaviour. Relations between these parameters and carbonate content are examined for offshore loading conditions, to assist in predicting behaviour under a given confining pressure of soil of known carbonate content.
893077 Geotechnical properties of weathered joints of decomposed granite Kamon, M
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 VI,
P181-184. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering. 1987 Rainfall induced slope failures in residual soils can be classified as erosive or jointed. Undisturbed homogeneous and jointed samples of decomposed biotite granite were taken using the method of Aoyama et al (1983). Shear strengths of intact homogeneous and jointed samples, and joint shear strength were measured in the saturated and unsaturated states. Saturation greatly reduces the shearing resistance of jointed residual soil masses. Results are discussed considering implications for slope stability.
893078 Mechanical properties of undisturbed decomposed granite soils Murata, H; Yasufuku, N
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 VI, P193-196. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering, 1987 Isotropic compression and triaxial shear tests were conducted on undisturbed granitic residual soils with various degrees of weathering. Samples were taken using the core bit described by Murata et al (1985). Influences of degree of weathering on mechanical properties and of disturbance on stress strain relations were investigated. Saturation was seen to significantly affect soil strength. Modified ignition loss was used as an index of degree of weathering.
893075 Problems of Red Coffee soils in Kenya Gichaga, F J; Sahu, B K; Visweswaraiya, T G; Atibu, F S
893079 Effect of drying and wetting on mechanical behavior of mudstone Shinjo, T; Komiya, Y
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 V1,
Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 V1,
P173-176. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering, 1987
P209-212. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering, 1987
Geotechnical properties of Red Coffee soils from 12 sites were determined. Abnormal properties are explained in terms of the clay fraction occurring as clusters of hard porous grains, and the major clay mineral occurring in 2 forms, halloysite and metahalloysite, with different engineering properties. Problems likely to arise if Red Coffee soils are used as foundation or construction materials, due to plasticity,cohesion, or cracking being different from that expected, are discussed.
Consolidated drained triaxial tests were performed on unweathered mudstones and intact mudstones weathered by wet-dry cycling. Deformation behaviour was analysed in terms of cross-anisotropy elastic theory, and five independent parameters are obtained. The failure criterion is determined as a power relationship. Weathering by wetting and drying has significant influence on the strength and deformation properties of mudstones.
1989 Pergamon Press pie. Reproduction not permitted