On the problem of cavity expansion in unsaturated soils

Russell, Adrian R.; Khalili, Nasser

doi:10.1007/s00466-005-0672-7

Cited by 76 publications

(88 citation statements)

References 42 publications

(69 reference statements)

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“…Kurnell sand is predominantly quartz containing no fines and has the index properties D 50 ¼ 0:31 mm; C u ¼ 1:83; G s ¼ 2:65; e min ¼ 0:60 and e max ¼ 0:92: Presented here is an extension of this calibration for unsaturated Kurnell sand. Specific details of experimental procedures and sample preparation are given in Reference [16]. Only the basic features are discussed here.…”

Section: Test Results and Theoretical Simulationsmentioning

confidence: 99%

“…ð1 þ k d xÞM cs controls the amount of energy dissipation. Equation (16) can be integrated to give the plastic potential g ¼ 0: Then m is defined by the general equation…”

Section: Plastic Potentialmentioning

confidence: 99%

“…The model is calibrated for speswhite kaolin using the triaxial compression test results for three load paths presented in Reference [2]; and for Kurnell sand, a predominantly quartz sand containing no fines, using the triaxial compression and oedometric compression test results reported in Reference [16].…”

Section: Introductionmentioning

confidence: 99%

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A unified bounding surface plasticity model for unsaturated soils

Russell

Khalili

2006

Int. J. Numer. Anal. Meth. Geomech.

150

114

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SUMMARYA unified constitutive model for unsaturated soils is presented in a critical state framework using the concepts of effective stress and bounding surface plasticity theory. Consideration is given to the effects of unsaturation and particle crushing in the definition of the critical state. A simple isotropic elastic rule is adopted. A loading surface and a bounding surface of the same shape are defined using simple and versatile functions. The bounding surface and elastic rules lead to the existence of a limiting isotropic compression line, towards which the stress trajectories of all isotropic compression load paths approach. A nonassociated flow rule of the same general form is assumed for all soil types. Isotropic hardening/softening occurs due to changes in plastic volumetric strains as well as suction for some unsaturated soils, enabling the phenomenon of volumetric collapse upon wetting to be accounted for. The model is used to simulate the stress-strain behaviour observed in unsaturated speswhite kaolin subjected to three triaxial test load paths. The fit between simulation and experiment is improved compared to that of other constitutive models developed using conventional Cam-Clay-based plasticity theory and calibrated using the same set of data. Also, the model is used to simulate to a high degree of accuracy the stress-strain behaviour observed in unsaturated Kurnell sand subjected to two triaxial test load paths and the oedometric compression load path. For oedometric compression theoretical simulations indicate that the suction was not sufficiently large to cause samples to separate from the confining ring.

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Section: Test Results and Theoretical Simulationsmentioning

confidence: 99%

“…ð1 þ k d xÞM cs controls the amount of energy dissipation. Equation (16) can be integrated to give the plastic potential g ¼ 0: Then m is defined by the general equation…”

Section: Plastic Potentialmentioning

confidence: 99%

See 1 more Smart Citation

A unified bounding surface plasticity model for unsaturated soils

Russell

Khalili

2006

Int. J. Numer. Anal. Meth. Geomech.

150

114

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“…Also, results of CPTs conducted by Vanapoli & Fathi [10] in a specially designed tank showed that cone resistance and bearing capacity of sand can be influenced by suction. Russell and Khalili [11] also showed that the cone penetration resistance is comparable to the required pressure for expansion of a spherical cavity in an infinite sand, and it could be increased due to presence of suction in an unsaturated condition. Further, CPT results on saturated and unsaturated sands in a suction-controlled calibration chamber conducted by Pournagiazar et al [12] showed that the effect of suction is more significant for low chamber confining stresses and low relative density values.…”

Section: Introductionmentioning

confidence: 93%

Simple Numerical Model to Simulate Penetration Testing in Unsaturated Soils

Jarast

Ghayoomi

2016

E3S Web Conf.

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Abstract. Cone penetration test in unsaturated sand is modelled numerically using Finite Element Method. Simple elastic-perfectly plastic Mohr-Coulomb constitutive model is modified with an apparent cohesion to incorporate the effect of suction on cone resistance. The Arbitrary Lagrangian-Eulerian (ALE) remeshing algorithm is also implemented to avoid mesh distortion problem due to the large deformation in the soil around the cone tip. The simulated models indicate that the cone resistance was increased consistently under higher suction or lower degree of saturation. Sensitivity analysis investigating the effect of input soil parameters on the cone tip resistance shows that unsaturated soil condition can be adequately modelled by incorporating the apparent cohesion concept. However, updating the soil stiffness by including a suction-dependent effective stress formula in Mohr-Coulomb material model does not influence the cone resistance significantly.

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“…However, engineers are left to interpret the CPT conducted in unsaturated soils using correlations developed for saturated and dry soils. This will inevitably lead to unknown errors in estimations of soil properties ( [2,4]). Limited research has been done on the CPT conducted in unsaturated soils and considerable further research is needed to identify the effect of unsaturation on the interpretation of CPT results, both theoretically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

The cone penetration test in unsaturated silty sands

Yang

Russell

2016

E3S Web Conf.

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Abstract. Very little is known about how to interpret the cone penetration test (CPT) when performed in unsaturated soils. The few published studies on the CPT in unsaturated soils have focused on either clean sands or a silt. In this study new results of laboratory-controlled CPTs in an unsaturated silty sand are presented. The silty sand exhibits hydraulic hysteresis and suction hardening. Suction is observed to have a pronounced affect on measured cone penetration resistance. For an isotropic net confining stress of 60 kPa it is observed that higher suctions give rise to cone penetration resistances that are 50% larger than those for lower suctions. A semi-theoretical correlation is presented that links measured cone penetration resistances to initial relative density and mean effective stress. For this silty sand it is shown that failing to account for suction may result in significant overestimations and unsafe predictions of soil properties from measured cone penetration resistances.

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On the problem of cavity expansion in unsaturated soils

Cited by 76 publications

References 42 publications

A unified bounding surface plasticity model for unsaturated soils

A unified bounding surface plasticity model for unsaturated soils

Simple Numerical Model to Simulate Penetration Testing in Unsaturated Soils

The cone penetration test in unsaturated silty sands

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