Cyclic behaviour of an unsaturated silt at various suctions and temperatures

Zhou, Chao

doi:10.1680/geot.14.p.015

Cited by 92 publications

(36 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Details of the test programme are given in Table 1. Figure 1 shows a schematic diagram of the suctionand temperature-controlled triaxial apparatus for measuring small strain behaviour (Ng & Zhou, 2014). Soil suction was controlled by the axis-translation technique.…”

Section: Test Programme and Apparatusmentioning

confidence: 99%

“…After calibration, the resolution and accuracy of each transducer were 1 and 3 μm, respectively, corresponding to strains of about 0·001 and 0·003%. Further details of the apparatus have been reported by Ng & Zhou (2014).…”

Section: Test Programme and Apparatusmentioning

confidence: 99%

“…According to the Unified Soil Classification System (ASTM, 2006), CDT is classified as silt (ML). More details of the CDT used are given elsewhere (Ng & Zhou, 2014). The water retention curve of the tested silt at 20°C was also reported by Ng & Zhou (2014).…”

Section: Soil Type and Specimen Preparationmentioning

confidence: 99%

“…Atkinson, 2000;Clayton, 2011), but shallow soils are often unsaturated and subjected to variations in pore water pressure (suction) and temperature (McCartney & Khosravi, 2013). Many experimental studies have shown that unsaturated soil behaviour is dependent on suction and temperature (Romero et al, 2003;François & Laloui, 2008;Tang et al, 2008;Uchaipichat & Khalili, 2009;Ng & Zhou, 2014;Tripathy et al, 2015), mainly focusing on the behaviour at large strains.…”

Section: Introductionmentioning

confidence: 99%

“…In the work reported here, the secant shear modulus of unsaturated soil was investigated using a suction-and temperature-controlled triaxial apparatus with small strain measurement (Ng & Zhou, 2014). In particular, suction and thermal effects on secant shear modulus were measured, and are discussed in this article.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effects of temperature and suction on secant shear modulus of unsaturated soil

Xu¹,

NG²

2015

Géotechnique Letters

View full text Add to dashboard Cite

Understanding of the secant shear modulus (G) of soil at small strains (lower than 1%) is essential to predict the performance of many earth structures in working conditions. Furthermore, soils at shallow depth are often unsaturated and subjected to variations of suction and temperature. Yet the effects of suction and temperature on G of unsaturated soils at small strains are often neglected and not fully understood. In this study, the secant shear modulus of an unsaturated silt was measured at various suctions and temperatures using a suction-and temperature-controlled triaxial apparatus with local strain measurement. The experimental results confirm that the shear modulus of unsaturated soil at small strains considerably increases with increasing suction under isothermal conditions, due to increases in the average skeleton stress and the stabilisation effects on the soil skeleton induced by meniscus water. On the other hand, at constant suction, G decreases as temperature increases. This is likely due to a reduction of the air-water surface tension with an increase in soil temperature, leading to a reduced influence of suction on G values.

show abstract

Section: Test Programme and Apparatusmentioning

confidence: 99%

Section: Test Programme and Apparatusmentioning

confidence: 99%

Section: Soil Type and Specimen Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of temperature and suction on secant shear modulus of unsaturated soil

Xu¹,

NG²

2015

Géotechnique Letters

View full text Add to dashboard Cite

show abstract

A hierarchical thermo‐hydro‐plastic constitutive model for unsaturated soils and its numerical implementation

Song

Wang

Bate

2018

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Unsaturated soils are highly heterogeneous 3-phase porous media. Variations of temperature, the degree of saturation, and density have dramatic impacts on the hydro-mechanical behavior of unsaturated soils. To model all these features, we present a thermo-hydro-plastic model in which the hydro-mechanical hardening and thermal softening are incorporated in a hierarchical fashion for unsaturated soils. This novel constitutive model can capture heterogeneities in density, suction, the degree of saturation, and temperature. Specifically, this constitutive model has 2 ingredients: (1) it has a "mesoscale" mechanical state variable-porosity and 3 environmental state variables-suction, the degree of saturation, and temperature; (2) both temperature and mechanical effects on water retention properties are taken into account. The return mapping algorithm is applied to implement this model at Gauss point assuming an infinitesimal strain. At each time step, the return mapping is conducted only in principal elastic strain space, assuming no return mapping in suction and temperature.The numerical results obtained by this constitutive model are compared with the experimental results. It shows that the proposed model can simulate the thermo-hydro-mechanical behavior of unsaturated soils with satisfaction. We also conduct shear band analysis of an unsaturated soil specimen under plane strain condition to demonstrate the impact of temperature variation on shear banding triggered by initial material heterogeneities. KEYWORDSconstitutive model, mesoscale, shear band, THM behavior, unsaturated soils INTRODUCTIONUnsaturated soils are 3-phase porous media with a solid phase-soil solid skeleton and 2 fluid phases-pore water, and pore air. 1-3 In the past several decades, the geomechanics community has shown significant interest in the thermo-hydro-mechanical (THM) analysis of unsaturated soils because the THM behavior of unsaturated soils is relevant to numerous engineering applications, such as nuclear waste disposal storage, pavements, geothermal energy, and buried high-voltage cables. In those applications, temperature impacts mechanical and physical behavior of unsaturated soils, such as the shear strength, deformation, and fluid flow and mass transport. 4,5 For instance, the increase in temperature may cause volumetric strain or dilation depending on the overconsolidation ratio of the soil. 6 For this reason, laboratory experiments 7-9 and numerical analysis 10-14 have been performed to probe the coupled multiphysical processes of solid

show abstract

Formulation and Implicit Numerical Integration of a Kinematic Hardening Model for Unsaturated Soils

Monforte,

Rouainia

2024

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Currently, our understanding of material‐scale deterioration resulting from meteorologically induced variations in pore water pressure and its significant impact on infrastructure slopes is limited. To bridge this knowledge gap, we have developed an extended kinematic hardening constitutive model for unsaturated soils that refines our understanding of weather‐driven deterioration mechanisms in heterogeneous clay soils. This model has the capability of predicting the irrecoverable degradation of strength and stiffness that has been shown to occur when soils undergo wetting and drying cycles. The model is equipped with a fully coupled and hysteretic water retention curve and a hysteretic loading–collapse curve and has the capability to predict the irrecoverable degradation of strength and stiffness that occurs during cyclic loading of soils. Here, we employ a fully implicit stress integration technique and give particular emphasis to deriving a consistent tangent operator, which includes the linearisation of the retention curve. The proposed algorithm is evaluated for efficiency and performance by simulating various stress and strain‐driven triaxial paths, and the accuracy of the integration technique is evaluated through the use of convergence curves.

show abstract

Cyclic behaviour of an unsaturated silt at various suctions and temperatures

Cited by 92 publications

References 32 publications

Effects of temperature and suction on secant shear modulus of unsaturated soil

Effects of temperature and suction on secant shear modulus of unsaturated soil

A hierarchical thermo‐hydro‐plastic constitutive model for unsaturated soils and its numerical implementation

Formulation and Implicit Numerical Integration of a Kinematic Hardening Model for Unsaturated Soils

Contact Info

Product

Resources

About