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Strength-deformation characteristics of a soil subjected to initial shear stress
220A 866054 Bearing capacity tests on reinforced sand subgrades Verma. B P; Char. A N R J Geotech Engng Dir ASCE VII2. N7. July 1986. P701-706 Bearing capacity tests on model footings on sand subgrades reinforced with galvanized rods placed vertically in the subgrade have shown beneficial effects of the reinforcements. The improvement compares favourably with the results obtained by investigations using horizontal forms of reinforcements. The improvement is a function of the spacing, diameter. roughness, and extent of the reinforcing elements. Auth.
866O55 Brittleness and the mechanical winning of coal Singh. S P Min Sci Technoi V3, N3, April 1986, P173-180 This study investigates the relationship between brittleness and other properties of coal which have an established influence upon the coal-winning process, The brittleness, in-situ cutting resistance, initial critical penetration stress, Protodyakonov strength index and % fines in the Protodyakonov test were determined for Sunny Side. Deer Creek and Price River coals in Utah. USA. It was observed that the cuttability, penetrability. Protodyakonov strength index and dust generation of coal are strongly dependent upon the brittleness of coal. The dependence of the properties on the brittleness of coal are discussed in light of the mechanical coal-winning process.
866056 Conditions of slip surface formation (In French) Habib. P Rev Fr Geotech N34. 1986, P5-15 Slip surface formation under conditions of plane strain is studled ['or work softening materials such as dense dilatant sands, thermoplastic materials and stiff clays. Softening is a plastic instability. These materials all show strength decreasing with deformation until a threshold is reached. Under plane strain deformation, the softening gives rise to the appearance of a local slip surt:ace. The strain energy is the minimum for failure of the sample, but the material is not completely destroyed as blocks retaining the original properties still remain on either side of the low strength surface.
866057 Advantages and disadvantages of lubricated platens in triaxial compression tests (In French) Colliat. J L: Desrues, J: Flavigny, E Rev Fr Geotech N34. 1986 P41-55 The comparative advantages and disadvantages of the use of frictionless end platens in the triaxial compression test are examined. The influences of platen lubrication and specimen height:diameter ratto on the stress-strain behaviour of fine sand under drained conditions and a range of confining pressures (0.05-10MPa) have been studied. TWO points are considered in detail, the bedding error introduced by the adoption of low friction platens, and the homogeneity of deformation of the samples. The latter point was investigated using an X-ray scanner.
866058 New test for tensile strength measurements (In French) Luong, M P Rer Fr Geotech N34. 1986. P69-74 A new homogeneous tensile test has been developed at the Laboratoire de Mecanique des Solides. The experimental technique is simple, practical and reliable, as well as rigorous from
a mechanics point of vtew. Concentric c}hndr~.al cuts arc made part way through a cylindrical specimen. ~hich ts loaded so as to place the region between the cuts under tensile stres~ It is suitable for all brittle materials and can be used under hostile conditions such as high temperature, under fluid immersion, radiation, high pressure or impact loadin~. 864~39 Strength-deformation characteristics of a soil subjected to initial shear stress Uchida, K: Hasegawa, T Soils Found V26. NI. March 1986. P11-24 Cyclic strength-deformation characteristics of fill dam material subject to initial static shear stress have been determined to provide information on the role of earthquake induced permanent deformation of soil under a sloping surface on the dynamic [.ailure of earth dams. A dynamic failure criterion is developed and the relation between initial shear stress and cyclic stress amplitude under dynamic failure is shown. Relations are quantitatively determined for permanent axial strain and residual pore pressure, which characterise the cyclic triaxial behaviour of soil subjected to initial shear stress
866O6O Deformation behaviour of anisotropic den~ sand under principal stress axes rotation Miura, K; Miura, S: Toki, S Soils Found V26. NI. March 1986. P36-52 Hollow cylinder torsional shear tests were carried out on dense anisotropic sands, with and without rotation of the principal stress axes. The effects of principal stress axes rotation on the mechanical bchaviour are seen to bc significant, as arc thc effects of the inherent anisotro pic fabric on the shear deformation and volume change.
866061 Effects of sample disturbance on dynamic properties of sand Tokimatsu. K; Hosaka, Y Soils" Found 1/26. NI, March 1986. P53-64 Laboratory tests were carried out on samples obtained by m situ freezing,thought likely to preserve the dynamic soil properties, and conventional coring with a triple tube sampler. Effects of sampling disturbance on drained shear strength and undrained cyclic shear strength were determined. A furthcr series of tests was carried out on samples reconstituted to resemble those taken by freezing. It is concluded that disturbance can be assessed to some extent by comparing values of elastic shear moduli measured in the field and in the laboratory.
866062 Strength and deformation characteristics of sand in plane strain compression at extremely low pressures Tatsuoka, F; Sakamoto, M: Kawamura, T: Fukushima. S Soils Found ii26. NI. March 1986. P65-84 Drained plane strain compression tests were performed on saturated sands at confining pressures 4.9-392kPa. Samples were prepared with angles between the bedding plane and the major principal stress axis (d) between 0-90 deg. The dependency of friction angle on minor principal stress was low for values of minor principal stress below 50kPa. Strength anisotropy was observed. Interrelation between d values or minor principal stress and friction angle and stress-dilatancy behaviour arc examined,
"i~ 1986 Pergamon Journals Ltd. Reproduction not permitted
866O55 Brittleness and the mechanical winning of coal Singh. S P Min Sci Technoi V3, N3, April 1986, P173-180 This study investigates the relationship between brittleness and other properties of coal which have an established influence upon the coal-winning process, The brittleness, in-situ cutting resistance, initial critical penetration stress, Protodyakonov strength index and % fines in the Protodyakonov test were determined for Sunny Side. Deer Creek and Price River coals in Utah. USA. It was observed that the cuttability, penetrability. Protodyakonov strength index and dust generation of coal are strongly dependent upon the brittleness of coal. The dependence of the properties on the brittleness of coal are discussed in light of the mechanical coal-winning process.
866056 Conditions of slip surface formation (In French) Habib. P Rev Fr Geotech N34. 1986, P5-15 Slip surface formation under conditions of plane strain is studled ['or work softening materials such as dense dilatant sands, thermoplastic materials and stiff clays. Softening is a plastic instability. These materials all show strength decreasing with deformation until a threshold is reached. Under plane strain deformation, the softening gives rise to the appearance of a local slip surt:ace. The strain energy is the minimum for failure of the sample, but the material is not completely destroyed as blocks retaining the original properties still remain on either side of the low strength surface.
866057 Advantages and disadvantages of lubricated platens in triaxial compression tests (In French) Colliat. J L: Desrues, J: Flavigny, E Rev Fr Geotech N34. 1986 P41-55 The comparative advantages and disadvantages of the use of frictionless end platens in the triaxial compression test are examined. The influences of platen lubrication and specimen height:diameter ratto on the stress-strain behaviour of fine sand under drained conditions and a range of confining pressures (0.05-10MPa) have been studied. TWO points are considered in detail, the bedding error introduced by the adoption of low friction platens, and the homogeneity of deformation of the samples. The latter point was investigated using an X-ray scanner.
866058 New test for tensile strength measurements (In French) Luong, M P Rer Fr Geotech N34. 1986. P69-74 A new homogeneous tensile test has been developed at the Laboratoire de Mecanique des Solides. The experimental technique is simple, practical and reliable, as well as rigorous from
a mechanics point of vtew. Concentric c}hndr~.al cuts arc made part way through a cylindrical specimen. ~hich ts loaded so as to place the region between the cuts under tensile stres~ It is suitable for all brittle materials and can be used under hostile conditions such as high temperature, under fluid immersion, radiation, high pressure or impact loadin~. 864~39 Strength-deformation characteristics of a soil subjected to initial shear stress Uchida, K: Hasegawa, T Soils Found V26. NI. March 1986. P11-24 Cyclic strength-deformation characteristics of fill dam material subject to initial static shear stress have been determined to provide information on the role of earthquake induced permanent deformation of soil under a sloping surface on the dynamic [.ailure of earth dams. A dynamic failure criterion is developed and the relation between initial shear stress and cyclic stress amplitude under dynamic failure is shown. Relations are quantitatively determined for permanent axial strain and residual pore pressure, which characterise the cyclic triaxial behaviour of soil subjected to initial shear stress
866O6O Deformation behaviour of anisotropic den~ sand under principal stress axes rotation Miura, K; Miura, S: Toki, S Soils Found V26. NI. March 1986. P36-52 Hollow cylinder torsional shear tests were carried out on dense anisotropic sands, with and without rotation of the principal stress axes. The effects of principal stress axes rotation on the mechanical bchaviour are seen to bc significant, as arc thc effects of the inherent anisotro pic fabric on the shear deformation and volume change.
866061 Effects of sample disturbance on dynamic properties of sand Tokimatsu. K; Hosaka, Y Soils" Found 1/26. NI, March 1986. P53-64 Laboratory tests were carried out on samples obtained by m situ freezing,thought likely to preserve the dynamic soil properties, and conventional coring with a triple tube sampler. Effects of sampling disturbance on drained shear strength and undrained cyclic shear strength were determined. A furthcr series of tests was carried out on samples reconstituted to resemble those taken by freezing. It is concluded that disturbance can be assessed to some extent by comparing values of elastic shear moduli measured in the field and in the laboratory.
866062 Strength and deformation characteristics of sand in plane strain compression at extremely low pressures Tatsuoka, F; Sakamoto, M: Kawamura, T: Fukushima. S Soils Found ii26. NI. March 1986. P65-84 Drained plane strain compression tests were performed on saturated sands at confining pressures 4.9-392kPa. Samples were prepared with angles between the bedding plane and the major principal stress axis (d) between 0-90 deg. The dependency of friction angle on minor principal stress was low for values of minor principal stress below 50kPa. Strength anisotropy was observed. Interrelation between d values or minor principal stress and friction angle and stress-dilatancy behaviour arc examined,
"i~ 1986 Pergamon Journals Ltd. Reproduction not permitted