Effects of Stress Path and Stress History on the Stiffness of Reconstituted London Clay

1986 ◽  
Vol 2 (1) ◽  
pp. 139-144 ◽  
Author(s):  
J. H. Atkinson ◽  
J. S. Evans ◽  
D. Richardson
Keyword(s):  
Stress Path ◽  
Triaxial Tests ◽  
Soil Parameters ◽  
Stress History ◽  
Strain Behaviour ◽  
Reconstituted Soil ◽  
Path Dependent ◽  
London Clay ◽  
Soil Behaviour

AbstractSoil behaviour is stress history dependent and stress path dependent and soil parameters, particularly those for stress-strain behaviour, measured in conventional triaxial tests may not represent the behaviour of soil in many civil engineering works.To obtain more realistic parameters it may be necessary to conduct laboratory tests which more closely represent in situ conditions before and during construction.The paper describes equipment developed at The City University to carry out stress path tests simply and economically. A series of CU triaxial tests and stress path tests on reconstituted soil illustrate the dependence of measured soil parameters on stress history and stress path.

Effect of consolidation history and stress path on hyperbolic stress–strain relations

1985 ◽  
Vol 22 (2) ◽  
pp. 172-176 ◽  
Author(s):  
Y. P. Vaid
Keyword(s):  
Stress Path ◽  
Triaxial Tests ◽  
Soil Deformation ◽  
Test Results ◽  
Stress Strain ◽  
Deviator Stress ◽  
Strain Behaviour ◽  
Stress Variable ◽  
Anisotropic Consolidation ◽  
Soil Behaviour

The hyperbolic approximation of the stress–strain behaviour of soil based on the results of conventional triaxial tests, which is used in incremental elastic analysis of soil deformation problems, is shown to be inapplicable for representing soil behaviour under anisotropic consolidation and different stress paths. Test results on a normally consolidated clay are presented to show that a separate hyperbolic representation of stress–strain behaviour is possible for each consolidation history and stress path if increment in deviator stress after consolidation, rather than deviator stress, is used as the stress variable. Hyperbolic parameters are thus shown to depend on test type.

Behaviour of recompacted residual soils in a constant shear stress path

2010 ◽  
Vol 47 (6) ◽  
pp. 648-661 ◽  
Author(s):  
S. M. Junaideen ◽  
L. G. Tham ◽  
K. T. Law ◽  
F. C. Dai ◽  
C. F. Lee
Keyword(s):  
Shear Stress ◽  
Soil Mechanics ◽  
Stress Path ◽  
Experimental Program ◽  
Published Data ◽  
Residual Soils ◽  
Constant Shear ◽  
Constant Shear Stress ◽  
Path Dependent ◽  
Soil Behaviour

The significance of studying soil behaviour in a constant shear stress path to understand rain-induced slope failures and debris flows has long been recognized. Studies with constant shear tests have, however, been limited, and some past results from undisturbed soils appear to show stress path–dependent volume change behaviour. The present study systematically investigates the behaviour of recompacted residual soils in a constant shear stress path using a comprehensive experimental program. It is shown that the results of this test program and previously published data can be interpreted using the concepts of critical-state soil mechanics.

Laboratory Testing: Assessing BS 5930

1986 ◽  
Vol 2 (1) ◽  
pp. 43-52 ◽  
Author(s):  
D. W. Hight
Keyword(s):  
Effective Stress ◽  
Site Investigation ◽  
Triaxial Tests ◽  
Cohesive Soils ◽  
Deformation Parameters ◽  
Strength And Deformation ◽  
Soil Behaviour ◽  
Measured Strength ◽  
Linear Nature

AbstractEstablished patterns of soil behaviour are used to illustrate: the divergence between parameters from laboratory and in situ tests; the changes in effective stress caused by sampling; and the influence of initial effective stress, p′0 on the measured strength and deformation parameters for cohesive soils.Current practice in onshore site investigation continues to make use of the unconsolidated undrained triaxial test in which p′0 is not controlled. Variations in p′0 after sampling and subsequent handling are shown to contribute to the scatter in undrained compression strength data.A plea is made for BS 5930 to encourage the measurement of effective stress in all undrained triaxial tests; to recognise the non-linear nature of soils; and to urge integration of laboratory and in situ tests.

scholarly journals Excavation Analysis using Stress Path Dependent Soil Parameters

2017 ◽  
Vol 3 (6) ◽  
Author(s):  
Hasbullah Nawir ◽  
Bagus Eko Prasetyo ◽  
Dayu Apoji
Keyword(s):  
Stress Path ◽  
Soil Parameters ◽  
Path Dependent

A review on modelling of the stress-strain behaviour of soil.

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Mary Dhanya ◽  
Priyanka P Manjanath
Keyword(s):  
Shear Strength ◽  
Moisture Content ◽  
Construction Material ◽  
Constitutive Models ◽  
Constitutive Modelling ◽  
Slope Instability ◽  
Triaxial Tests ◽  
Stress And Strain ◽  
Strain Behaviour ◽  
Soil Behaviour

Soil has been used as a construction material since antiquity with both success and failure. As the earth material is widely available and relatively economical, it has been found very useful in the construction of foundations, subgrades, embankments and as backfill. The collapsibility of soil is mainly due to the decrease of shear strength and macro-deformation with the increase of moisture content. This can result in some serious problems, such as the differential settlement of the foundation, landslides, and slope instability, resulting in a series of damages of infrastructures and loss of human lives to some degree. In civil engineering, it is very important to make realistic predictions of the behaviour of soil under various conditions. Triaxial tests are to be carried out to study soil behaviour. The results will indicate the shear damage characteristics during the test. The relation of stress and strain of soils can be expressed using constitutive models. It can provide a brief idea about how soil will behave under different conditions. Application of Neural Network can be used to develop a data-driven constitutive modelling of the soil. Keywords- Shear strength, Triaxial test, moisture content, constitutive model

Stress Path Tests on 100 mm Diameter Samples

1986 ◽  
Vol 2 (1) ◽  
pp. 133-137
Author(s):  
J. H. Atkinson ◽  
D. B. Clinton
Keyword(s):  
Stress Path ◽  
Triaxial Tests ◽  
Test Results ◽  
Design Problems ◽  
Strain Behaviour ◽  
Engineering Design Problems ◽  
Geotechnical Design ◽  
Pore Pressure Response ◽  
The City ◽  
Test Stress

AbstractThe use of stress path tests is discussed in relation to geotechnical design, and a description is given of the triaxial test stress path apparatus developed at The City University.Test results are presented from a series of triaxial tests following stress paths commonly encountered in engineering design problems. These are compared with the results of conventional triaxial tests.The stress-strain behaviour and pore pressure response of soil are shown to be very much dependent on the stress path followed, and the advantages of using stress-controlled loading in triaxial tests is demonstrated.

Static and cyclic liquefaction potential of Fraser Delta sand in simple shear and triaxial tests

1996 ◽  
Vol 33 (2) ◽  
pp. 281-289 ◽  
Author(s):  
Y P Vaid ◽  
S Sivathayalan
Keyword(s):  
Simple Shear ◽  
Large Degree ◽  
Stress Path ◽  
Economic Benefits ◽  
Stress Conditions ◽  
Triaxial Tests ◽  
Cyclic Triaxial ◽  
Liquefaction Potential ◽  
Sand Liquefaction ◽  
Soil Behaviour

The potential for static and cyclic liquefaction of the sand that underlies the highly seismic Fraser Delta is assessed under simple shear test conditions, typical of an earthquake shaking. A comparison of liquefaction potential is also made between simple shear and conventional triaxial stress conditions. It is shown that the liquefaction potential of sand is profoundly influenced by the stress path. The reduction factors currently applied to the cyclic triaxial resistance for representing simple shear response may involve a large degree of conservatism in design. A direct measurement of soil behaviour under stress conditions typical of earthquake loading may thus have large economic benefits. Key words: sand, liquefaction, static, cyclic, triaxial, simple shear.

Generalized stress-path-dependent soil behaviour with a new hollow cylinder torsional apparatus

1990 ◽  
Vol 27 (5) ◽  
pp. 601-616 ◽  
Author(s):  
Y. P. Vaid ◽  
A. Sayao ◽  
Enhuang Hou ◽  
D. Negussey
Keyword(s):  
Principal Stress ◽  
Hollow Cylinder ◽  
Path Dependence ◽  
Stress Path ◽  
Dense Sand ◽  
Deformation Response ◽  
Stress Rotation ◽  
Path Dependent ◽  
Offshore Wave ◽  
Soil Behaviour

A new hollow cylinder torsional shear apparatus is described. The apparatus is suitable for investigating soil behaviour under generalized stress paths, including principal stress rotations, characteristic of earthquake and offshore-wave loadings. A new, more rational assessment of stress nonuniformity across the wall of the hollow cylinder specimen is made, and the "no go" regions of the stress space are delineated that limit stress nonuniformity to acceptable levels. Operation of the apparatus and experimental procedures for tests on reconstituted specimens of sand are described. Typical results of drained tests on loose and dense sand are presented to illustrate the capabilities of the apparatus as a general stress-path loading device and to highlight the stress-path dependence of soil behaviour, in particular, the deformation response to principal stress rotations. Key words: hollow cylinder apparatus, generalized stress paths, principal stress rotation, sand, deformations.

Interpretation and modelling of deformation characteristics of a stiff North Sea clay

2006 ◽  
Vol 43 (4) ◽  
pp. 341-354 ◽  
Author(s):  
Vojkan Jovičić ◽  
Matthew Coop ◽  
Brian Simpson
Keyword(s):  
North Sea ◽  
Small Strain ◽  
Triaxial Tests ◽  
Simple Assumption ◽  
Stiff Clays ◽  
Class A ◽  
Numerical Predictions ◽  
Deformation Properties ◽  
London Clay ◽  
Soil Behaviour

An investigation into the behaviour of North Sea glaciomarine clays was carried out in which triaxial tests were conducted on both natural and reconstituted samples to assess the effects of structure. Although the tests were conventional CID tests, high quality instrumentation was used. The tests were also technically difficult both because of the very long test durations and because some of the samples were swelled back to very low effective stresses so that the effect of swelling on the influence of structure on the soil behaviour could be assessed. A "Class A" prediction of the behaviour in these tests was carried out using the BRICK model. Although the model is not designed to account for the influence of structure, it was found that its effects could be simulated by allowing the soil to have artificially high overconsolidation ratios (OCRs) so that the high undrained shear strengths resulting from structure could be modelled. Making the simple assumption that the decay of stiffness could be scaled from that of London Clay, reasonable predictions of the behaviour were made. The discrepancies between the predictions and the measured behaviour became significant only at the lowest stresses, where structure dominates the behaviour of the natural soil.Key words: laboratory testing, small strain stiffness, stiff clays, structure of soil, numerical predictions, shear deformation properties.

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