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Reevaluation of the conventional triaxial test methods
334A 906090 Influence of filter paper and leakage on triaxial testing Leroueil, S; Tavenas, F; La Rochelle, P; Tremblay, M
906094 Triaxial testing of granular soil under elevated cell pressure Colliat-Dangus, J L; Desrues, J; Foray, P
Proc Symposium on Advanced Triaxinl Testing of Soil and Rock, Louisville, 19-20 June 1986 P189-201. Publ Philadelphia: ASTM, 1988 ( ASTM Special Technical Publication 977)
Proc Symposium on Advanced Triaxial Testing of Soil and Rock, Louisville, 19-20 June 1986 P290-310. Publ Philadelphia: ASTM, 1988 (ASTM Special Technical Publication 977)
Errors arise in long term triaxial tests on soils due to leakage of fluids through the cell membrane. Silicone oil was selected as the most suitable cell fluid as it has low rate of permeability through membrane materials and does not affect them chemically. Filter paper drains are used in consolidation tests. Drainage capacity of 5 papers has been examined and their effects on consolidation and shear processes compared. Overall, filter paper drains have little effect on test results.
Behaviour of a siliceous sand and a marine calcareous sand on triaxial testing at high cell pressure was examined as part of a research program on offshore piling. Influences of end lubrication and specimen geometry were investigated. Specimen homogeneity was studied using tomodensitometry. Consolidated drained tests were carried out at cell pressures up to 15MPa. Short, lubricated specimens are recommended for measurement of soil properties, because of their better homogeneity. Creep effects, which increased with increasing cell pressure, were seen during the consolidation stages. Particle crushing occurred in the calcareous soil.
906091 Measurement of deformations in a standard triaxial environment with a comparison of local versus global measurements on a fine, fully drained sand Linton, P F; McVay, M C; Bloomquist, D
Proc Symposium on Advanced Triaxial Testing of Soil and Rock, Louisville, 19-20 June 1986 P202-215. Publ Philadelphia: ASTM, 1988 (ASTM Special Technical Publication 977)
906095 Consolidated drained triaxial testing of Piedmont residual soil Lambe, P C; Heartz, W T
Proc Symposium on Advanced Triaxial Testing of Soil and Rock, Louisville, 19-20 June 1986 P311-320. Publ Philadelphia: ASTM, 1988 (ASTM Special Technical Publication 977)
Deformation measurement devices are briefly reviewed: strain gauges, LVDTs, and non-contact devices. A series of hydrostatic compression and standard cyclic triaxial compression tests was carried out on saturated, drained, poorly graded sand. Deformation measurements made with direct current LVDTs (DCDTs) fixed to the middle third of the specimen and those from a macro method using a burette and strain gauge are compared. End friction and membrane penetration effects are discussed. A new method of measuring saturation of samples of coarse graded soil is described.
Micaceous, silty Piedmont residual soils show steeply dipping layers, planes of weakness, and granular seams. Specimens were trimmed from block and Shelby tube samples. Soil inhomogeneity led to trimming complications,and to some specimens bending in consolidation and shear and failing at low strains. Results of multi-stage tests on a specimen are compared to those of three single stage tests on specimens cut from the same block. Comparison of results was inconclusive.
906092 Reevaluation of the conventional triaxial test methods Baldi, G; Hight, D W; Thomas, G E
906096 Triaxial testing of marine sediments with high gas contents g a u , G; Chancy, R C
Proc Symposium on Advanced Trinxinl Testing of Soil and Rock, Louisville, 19-20 June 1986 P219-263. Publ Philadelphia: ASTM, 1988 (ASTM Special Technical Publication 977)
Proc Symposium on Advanced Trinxial Testing of Soil and Rock, Louisville, 19-20 June 1986 P338-352. Publ Philadelphia: ASTM, 1988 (ASTM Special Technical Publication 977)
A re-evaluation is made considering the advances in techniques and technology since the 'Triaxial Book' of Bishop and Henkel (1962). Advantages and limitations of the triaxial test on cylindrical specimens are first considered. Load, displacement and pore pressure measurement, sources of error, specimen preparation and installation, measurement of initial effective stress in clay, unconsolidated undrained tests, and stress path testing are discussed. 74 refs.
The change in total stress on a marine solid when sampled has the effect of releasing gases from solution and expanding the soil sample. This expansion of gases in soil samples leads to changes in physical and engineering properties. Gas types, marine sediment zonations, the corresponding mechanism of bubble formation and methods of performing triaxial tests on gassy sediments are discussed. A method to estimate the amount of gas that theoretically comes out of solution is presented. Decreasing bulk modulus is seen to reduce the pore pressure increment per application of load increment.
906093 Triaxial testing methods for soils Lacasse, S; Berre, T Proc Symposium on Advanced Triaxiai Testing of Soil and
Rock, Louisville, 19-20 June 1986 P264-289. Publ Philadelphia: ASTM, 1988 ( ASTM Special Technical Publication 977) Current procedures at the NGI are presented. Testing machines, sampling, specimen mounting and saturation, consolidation, and static and cyclic shear are outlined. Sample disturbance, end effects, anisotropic consolidation, and specimen geometry are considered in detail. A new method to measure initial shear modulus in triaxial soil specimens is described. Recommendations are made for further improvements.
906097 Results and interpretation of multistage triaxial compression tests Soranzo, M
Proc Symposium on Advanced Trinxial Testiq of Soil and Rock, Louisville, 19-20 June 1986 P353-362. Publ Philadelphia: ASTM, 1988 ( ASTM Special Technical Publication 977) Triaxial testing of cylindrical soil specimens is common because it allows a wide range of mechanical parameters to be examined during consolidation and shear phases. The procedure for performing and interpreting multistage triaxiai compression tests is described. The results obtained from
© 1990 Pergamon Press pie. Reproduction not permitted
906094 Triaxial testing of granular soil under elevated cell pressure Colliat-Dangus, J L; Desrues, J; Foray, P
Proc Symposium on Advanced Triaxinl Testing of Soil and Rock, Louisville, 19-20 June 1986 P189-201. Publ Philadelphia: ASTM, 1988 ( ASTM Special Technical Publication 977)
Proc Symposium on Advanced Triaxial Testing of Soil and Rock, Louisville, 19-20 June 1986 P290-310. Publ Philadelphia: ASTM, 1988 (ASTM Special Technical Publication 977)
Errors arise in long term triaxial tests on soils due to leakage of fluids through the cell membrane. Silicone oil was selected as the most suitable cell fluid as it has low rate of permeability through membrane materials and does not affect them chemically. Filter paper drains are used in consolidation tests. Drainage capacity of 5 papers has been examined and their effects on consolidation and shear processes compared. Overall, filter paper drains have little effect on test results.
Behaviour of a siliceous sand and a marine calcareous sand on triaxial testing at high cell pressure was examined as part of a research program on offshore piling. Influences of end lubrication and specimen geometry were investigated. Specimen homogeneity was studied using tomodensitometry. Consolidated drained tests were carried out at cell pressures up to 15MPa. Short, lubricated specimens are recommended for measurement of soil properties, because of their better homogeneity. Creep effects, which increased with increasing cell pressure, were seen during the consolidation stages. Particle crushing occurred in the calcareous soil.
906091 Measurement of deformations in a standard triaxial environment with a comparison of local versus global measurements on a fine, fully drained sand Linton, P F; McVay, M C; Bloomquist, D
Proc Symposium on Advanced Triaxial Testing of Soil and Rock, Louisville, 19-20 June 1986 P202-215. Publ Philadelphia: ASTM, 1988 (ASTM Special Technical Publication 977)
906095 Consolidated drained triaxial testing of Piedmont residual soil Lambe, P C; Heartz, W T
Proc Symposium on Advanced Triaxial Testing of Soil and Rock, Louisville, 19-20 June 1986 P311-320. Publ Philadelphia: ASTM, 1988 (ASTM Special Technical Publication 977)
Deformation measurement devices are briefly reviewed: strain gauges, LVDTs, and non-contact devices. A series of hydrostatic compression and standard cyclic triaxial compression tests was carried out on saturated, drained, poorly graded sand. Deformation measurements made with direct current LVDTs (DCDTs) fixed to the middle third of the specimen and those from a macro method using a burette and strain gauge are compared. End friction and membrane penetration effects are discussed. A new method of measuring saturation of samples of coarse graded soil is described.
Micaceous, silty Piedmont residual soils show steeply dipping layers, planes of weakness, and granular seams. Specimens were trimmed from block and Shelby tube samples. Soil inhomogeneity led to trimming complications,and to some specimens bending in consolidation and shear and failing at low strains. Results of multi-stage tests on a specimen are compared to those of three single stage tests on specimens cut from the same block. Comparison of results was inconclusive.
906092 Reevaluation of the conventional triaxial test methods Baldi, G; Hight, D W; Thomas, G E
906096 Triaxial testing of marine sediments with high gas contents g a u , G; Chancy, R C
Proc Symposium on Advanced Trinxinl Testing of Soil and Rock, Louisville, 19-20 June 1986 P219-263. Publ Philadelphia: ASTM, 1988 (ASTM Special Technical Publication 977)
Proc Symposium on Advanced Trinxial Testing of Soil and Rock, Louisville, 19-20 June 1986 P338-352. Publ Philadelphia: ASTM, 1988 (ASTM Special Technical Publication 977)
A re-evaluation is made considering the advances in techniques and technology since the 'Triaxial Book' of Bishop and Henkel (1962). Advantages and limitations of the triaxial test on cylindrical specimens are first considered. Load, displacement and pore pressure measurement, sources of error, specimen preparation and installation, measurement of initial effective stress in clay, unconsolidated undrained tests, and stress path testing are discussed. 74 refs.
The change in total stress on a marine solid when sampled has the effect of releasing gases from solution and expanding the soil sample. This expansion of gases in soil samples leads to changes in physical and engineering properties. Gas types, marine sediment zonations, the corresponding mechanism of bubble formation and methods of performing triaxial tests on gassy sediments are discussed. A method to estimate the amount of gas that theoretically comes out of solution is presented. Decreasing bulk modulus is seen to reduce the pore pressure increment per application of load increment.
906093 Triaxial testing methods for soils Lacasse, S; Berre, T Proc Symposium on Advanced Triaxiai Testing of Soil and
Rock, Louisville, 19-20 June 1986 P264-289. Publ Philadelphia: ASTM, 1988 ( ASTM Special Technical Publication 977) Current procedures at the NGI are presented. Testing machines, sampling, specimen mounting and saturation, consolidation, and static and cyclic shear are outlined. Sample disturbance, end effects, anisotropic consolidation, and specimen geometry are considered in detail. A new method to measure initial shear modulus in triaxial soil specimens is described. Recommendations are made for further improvements.
906097 Results and interpretation of multistage triaxial compression tests Soranzo, M
Proc Symposium on Advanced Trinxial Testiq of Soil and Rock, Louisville, 19-20 June 1986 P353-362. Publ Philadelphia: ASTM, 1988 ( ASTM Special Technical Publication 977) Triaxial testing of cylindrical soil specimens is common because it allows a wide range of mechanical parameters to be examined during consolidation and shear phases. The procedure for performing and interpreting multistage triaxiai compression tests is described. The results obtained from
© 1990 Pergamon Press pie. Reproduction not permitted