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Shear behaviour calculation of sand acted on by a plane strain (in French)
17BA
83603~ SIMPLE OPTIMIZATION TECHNIQUES FOR EVALUATINS D ~ O N MODULI FROM ~ ~ATIONS. TECHNICAL NOTE Arai, K; Ohta, H; Yas1~i, T Soils Foumd, V23, NI, March 1983, PI07-I13
8360~0 "rm~±'iARY~ MODEL FOR FROZEN SANDS Ting, J M J Geotech Emgr~ Div ASCE, VI09, NGTT, July
1983, P932-945 An empirical model to describe the unconfined com~resslve creep behaviour of frozen sards is developed. When combined with the proposed method for parameter evaluation, th~s model accounts for the effect of al~plied axial stress, ambient temperature ard level of pare ice saturation a~d can be used reliably fur data fitting and cree~ prediction. Comparisons indicate that this new tertiary creep model is more accurate and reliable than primary and secondary creep models. Auth.
A numerical procedure using a cc~bi~ation of the finite element method and mathematical programmlng is proposed for estimating the Y c ~ ' s modt~lus and Poisso~'s ratio of a soil deposit, based on field measurements. 836036 SHEAR BEHAVIOUR CALCULATION OF SAND ACTED ON BY A ISLA~E STRAIN (IN FRENCH) Mo~met, J Rev Fr Geotech, N21, Nov 1982, ~i-~5 A model is proposed fc~ the behavlour law a~d is used to prelict soil behaviou~ for the case of a plane deformation starting from a null longitudinal strain. The model is four~ to agree with p~llshed experimental results. The model is also adapted to a finite element program. 836037 DEFORMATION OF A SAND SAMISiE ON ISOTROPICSTRESS PATHS: INFLUENCE OF HISTOHY (IN ~ ) Lanier, J Rev FT GeOtech, N20, Aug 1982, P21-2 9 Experiments were performed on dry sar~ samples in a true triaxial apparatus: isotroplc tests and sxisy~metric wi%h lateral constant stress tests. From the results it is found that the ccrrespordlng strain on the isotropic stress path is non isotropic b~t depends on %he triaxial test which Just precedes it.
Surface properties 836O38
836039
VAPOR-PRESSURE LOWERING IN G ~ SYST~IS Hsieh, C H; Ramey, H J Soc Pet Er6r J, V23, NI, Feb i ~ 3 , PI~7-167
836o~1
ON THE NATURE OF THE MINIMUM CPJ~EP RATE-TIME CORRELATION FOR SOIL, ICE, AND FROZEN SOIL. TECHNICAL NOTE Ting, J M Can Geotech J, V20, NI, Feb 1983, P176-182 Examines the nature of the linear correlation observed between the logarithm of the minimum creep rate and the logarithm of the time to reach this minimum creep rate in soil, ice, and frozen soil. Simple mathematical creep models show that this correlation is due to the existence of an approximately constant strain at the minimum strain rate, and the relative inser~itivity of the double logarithmic plot to small deviations from this al~oximately c O ~ a ~ strain.
836o~2 INFLUENCE OF STRAIN RATE ON PORE PRESSURES IN CONSOLIDATED UNDRAINED TRIAXIAL TESTS ON COHESIVE SOILS K i ~ a , T; Saitoh, K Soils Found, V23, NI, March 1983, P80-90
FactOrs causing water vapour pressure lowerir~ in porous media, such as geothermal steam reservoirs, include capillarity and surface adsorption. The kinetics of adsorption are examined. The vapour pressure lowe~'ing phenomenon is investigated for a r a ~ e of temperatures by measurir~ vapour pressure versus mass of water adsorbed in sandstone cores amd unconsolidated silica sands. Isotherms for several si~lecomponent fluids are obtained.
Consolidated urdralned triaxi81 tests were performed on 3 types of cohesive soil with different plasticity indexes. Small transducers were used to measure pure pressure at the centre bottom and periphery of the test specimens. It was found that at low strains pore ~ressures at the centre were greatest, while at high strains the difference was less. The difference in pare ~ressures was smaller at lower strain rates and fc~ soils with a lower plasticity index. Pore l~ressures in specimens of soil with plasticity index up to 30 were considered to he uniform at a strain rate of ~ per cent/h.
Time dependent behaviour
Physico-chemicai properties
TIME EFFECTS ON THE STRESS-STRAIN B~AVIOUR OF NATURAL SOFT CLAYS Graham, J; Crooks, J H A; Bell, A L Geotechnique, VB3, NB, Sept 1983, P327-3~0 Lightly overconsolldated clays exhibit significant time-dependent s~ress-strain characteristlcs. Regardless of soil type, undrained shear strer~ths and preconsolldatlon pressures charge by about 10-20 per cent for a tenfold change in strain rate. For the soils considered, n~drained shear tests and oedcmeteT tests show that the strain rate effect decreases with increasing strain beyond yield. In ur~ained shear tests, it is indeperzlent cf plasticity, consolidation stress ratio cr stress level. Teats on Belfast clay and Winnipeg clay confirm the time dependency of yield behavioIxr in natural clays.
836043 SUC~ESTED TEST METHOD FOR D~r2~MINATION OF THE SOLUBLE SALT CONTENT OF SOILS BY R E F R A ~ Chancy, R C; Slonim, S M; Slonim, S S Geotech Test J, V6, N2, Jura 1983, P93-95 A method suitable fcr l a b c r a t ~ c~ field application is ~roposed to extract pore water from a soil and determine its salinity. The pore water is extracted from the soil usir~ a soil ~ress criglnally developed by Mri~kov and Komarova. Once the pore water has been extracted its salinity is determir~ using a hard-held refractometere Using this method it is possible to measure salinity to an accuracy of within ippt. 8360A~ CRITICAL REAPPRAISAL OF PSA~fICITY INEEX OF SOILS. TECHNICAL NOTE Ns4Eara~, T S; Jayadeva, M S J Geotech Er~ng Div ASCE, VI09, N~TT, July
1983, P99~-iooo
83603~ SIMPLE OPTIMIZATION TECHNIQUES FOR EVALUATINS D ~ O N MODULI FROM ~ ~ATIONS. TECHNICAL NOTE Arai, K; Ohta, H; Yas1~i, T Soils Foumd, V23, NI, March 1983, PI07-I13
8360~0 "rm~±'iARY~ MODEL FOR FROZEN SANDS Ting, J M J Geotech Emgr~ Div ASCE, VI09, NGTT, July
1983, P932-945 An empirical model to describe the unconfined com~resslve creep behaviour of frozen sards is developed. When combined with the proposed method for parameter evaluation, th~s model accounts for the effect of al~plied axial stress, ambient temperature ard level of pare ice saturation a~d can be used reliably fur data fitting and cree~ prediction. Comparisons indicate that this new tertiary creep model is more accurate and reliable than primary and secondary creep models. Auth.
A numerical procedure using a cc~bi~ation of the finite element method and mathematical programmlng is proposed for estimating the Y c ~ ' s modt~lus and Poisso~'s ratio of a soil deposit, based on field measurements. 836036 SHEAR BEHAVIOUR CALCULATION OF SAND ACTED ON BY A ISLA~E STRAIN (IN FRENCH) Mo~met, J Rev Fr Geotech, N21, Nov 1982, ~i-~5 A model is proposed fc~ the behavlour law a~d is used to prelict soil behaviou~ for the case of a plane deformation starting from a null longitudinal strain. The model is four~ to agree with p~llshed experimental results. The model is also adapted to a finite element program. 836037 DEFORMATION OF A SAND SAMISiE ON ISOTROPICSTRESS PATHS: INFLUENCE OF HISTOHY (IN ~ ) Lanier, J Rev FT GeOtech, N20, Aug 1982, P21-2 9 Experiments were performed on dry sar~ samples in a true triaxial apparatus: isotroplc tests and sxisy~metric wi%h lateral constant stress tests. From the results it is found that the ccrrespordlng strain on the isotropic stress path is non isotropic b~t depends on %he triaxial test which Just precedes it.
Surface properties 836O38
836039
VAPOR-PRESSURE LOWERING IN G ~ SYST~IS Hsieh, C H; Ramey, H J Soc Pet Er6r J, V23, NI, Feb i ~ 3 , PI~7-167
836o~1
ON THE NATURE OF THE MINIMUM CPJ~EP RATE-TIME CORRELATION FOR SOIL, ICE, AND FROZEN SOIL. TECHNICAL NOTE Ting, J M Can Geotech J, V20, NI, Feb 1983, P176-182 Examines the nature of the linear correlation observed between the logarithm of the minimum creep rate and the logarithm of the time to reach this minimum creep rate in soil, ice, and frozen soil. Simple mathematical creep models show that this correlation is due to the existence of an approximately constant strain at the minimum strain rate, and the relative inser~itivity of the double logarithmic plot to small deviations from this al~oximately c O ~ a ~ strain.
836o~2 INFLUENCE OF STRAIN RATE ON PORE PRESSURES IN CONSOLIDATED UNDRAINED TRIAXIAL TESTS ON COHESIVE SOILS K i ~ a , T; Saitoh, K Soils Found, V23, NI, March 1983, P80-90
FactOrs causing water vapour pressure lowerir~ in porous media, such as geothermal steam reservoirs, include capillarity and surface adsorption. The kinetics of adsorption are examined. The vapour pressure lowe~'ing phenomenon is investigated for a r a ~ e of temperatures by measurir~ vapour pressure versus mass of water adsorbed in sandstone cores amd unconsolidated silica sands. Isotherms for several si~lecomponent fluids are obtained.
Consolidated urdralned triaxi81 tests were performed on 3 types of cohesive soil with different plasticity indexes. Small transducers were used to measure pure pressure at the centre bottom and periphery of the test specimens. It was found that at low strains pore ~ressures at the centre were greatest, while at high strains the difference was less. The difference in pare ~ressures was smaller at lower strain rates and fc~ soils with a lower plasticity index. Pore l~ressures in specimens of soil with plasticity index up to 30 were considered to he uniform at a strain rate of ~ per cent/h.
Time dependent behaviour
Physico-chemicai properties
TIME EFFECTS ON THE STRESS-STRAIN B~AVIOUR OF NATURAL SOFT CLAYS Graham, J; Crooks, J H A; Bell, A L Geotechnique, VB3, NB, Sept 1983, P327-3~0 Lightly overconsolldated clays exhibit significant time-dependent s~ress-strain characteristlcs. Regardless of soil type, undrained shear strer~ths and preconsolldatlon pressures charge by about 10-20 per cent for a tenfold change in strain rate. For the soils considered, n~drained shear tests and oedcmeteT tests show that the strain rate effect decreases with increasing strain beyond yield. In ur~ained shear tests, it is indeperzlent cf plasticity, consolidation stress ratio cr stress level. Teats on Belfast clay and Winnipeg clay confirm the time dependency of yield behavioIxr in natural clays.
836043 SUC~ESTED TEST METHOD FOR D~r2~MINATION OF THE SOLUBLE SALT CONTENT OF SOILS BY R E F R A ~ Chancy, R C; Slonim, S M; Slonim, S S Geotech Test J, V6, N2, Jura 1983, P93-95 A method suitable fcr l a b c r a t ~ c~ field application is ~roposed to extract pore water from a soil and determine its salinity. The pore water is extracted from the soil usir~ a soil ~ress criglnally developed by Mri~kov and Komarova. Once the pore water has been extracted its salinity is determir~ using a hard-held refractometere Using this method it is possible to measure salinity to an accuracy of within ippt. 8360A~ CRITICAL REAPPRAISAL OF PSA~fICITY INEEX OF SOILS. TECHNICAL NOTE Ns4Eara~, T S; Jayadeva, M S J Geotech Er~ng Div ASCE, VI09, N~TT, July
1983, P99~-iooo