The role of cementation in the behaviour of cemented soils

Lade, Poul V.; Trads, Niels

doi:10.1680/gr.14.00011

Cited by 45 publications

(17 citation statements)

References 76 publications

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“…In accordance to that, the test results clearly showed a delayed dilation, which is typical also for cemented sands (Lade & Trads, 2014;Leroueil & Vaughan, 1990;Wang & Leung, 2008). Interestingly, in our studies we observe a conspicuous secondary hardening response of GHBS, which was characterized by partial or even full recovery of apparent structuration strength.…”

Section: 1029/2019gc008458supporting

confidence: 91%

Strain Rate‐Dependent Hardening‐Softening Characteristics of Gas Hydrate‐Bearing Sediments

Deusner

Gupta

Xie

et al. 2019

Geochem Geophys Geosyst

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The presence of gas hydrates (GHs) increases the stiffness and strength of marine sediments. In elasto‐plastic constitutive models, it is common to consider GH saturation (Sh) as key internal variable for defining the contribution of GHs to composite soil mechanical behavior. However, the stress‐strain behavior of GH‐bearing sediments (GHBS) also depends on the microscale distribution of GH and on GH‐sediment fabrics. A thorough analysis of GHBS is difficult, because there is no unique relation between Sh and GH morphology. To improve the understanding of stress‐strain behavior of GHBS in terms of established soil models, this study summarizes results from triaxial compression tests with different Sh, pore fluids, effective confining stresses, and strain histories. Our data indicate that the mechanical behavior of GHBS strongly depends on Sh and GH morphology, and also on the strain‐induced alteration of GH‐sediment fabrics. Hardening‐softening characteristics of GHBS are strain rate‐dependent, which suggests that GH‐sediment fabrics dynamically rearrange during plastic yielding events. We hypothesize that rearrangement of GH‐sediment fabrics, through viscous deformation or transient dissociation and reformation of GHs, results in kinematic hardening, suppressed softening, and secondary strength recovery, which could potentially mitigate or counteract large‐strain failure events. For constitutive modeling approaches, we suggest that strain rate‐dependent micromechanical effects from alterations of the GH‐sediment fabrics can be lumped into a nonconstant residual friction parameter. We propose simple empirical evolution functions for the mechanical properties and calibrate the model parameters against the experimental data.

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Section: 1029/2019gc008458supporting

confidence: 91%

Strain Rate‐Dependent Hardening‐Softening Characteristics of Gas Hydrate‐Bearing Sediments

Deusner

Gupta

Xie

et al. 2019

Geochem Geophys Geosyst

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“…Lade and Trads, 2014;Likitlersuang et al, 2014). This suggests that the tendency of lime-treated specimens containing salt to exhibit a dilative behaviour during drained loading results in an increase in the soil's shear strength within 7 d of curing.…”

Section: Drained Behaviourmentioning

confidence: 96%

Strength improvement of lime-treated clay with sodium chloride

Yunus¹,

Wanatowski

Marto

et al. 2017

Geotechnical Research

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Lime stabilisation of organic clay has often been studied in the past. However, there is some evidence in the literature that the presence of high concentrations of organic matter in clay soil can lessen the chemical reaction between lime and clay minerals and can have detrimental effects on the engineering properties of soil. Hence, in this paper, the stress-strain behaviour and strength properties of organic soil treated with lime and sodium chloride (NaCl) are analysed. A soil mixture, prepared with 5% lime content and 1·5% humic acid, was stabilised with varying quantities of sodium chloride (0·5, 2·0 and 5·0%). Consolidated undrained and drained triaxial tests were carried out on specimens at curing periods of 7 and 28 d with applied confining pressures of 50 and 100 kPa. Scanning electron microscopy and X-ray diffraction analysis were used to observe the microstructural changes resulting from cementation materials. It was found that the introduction of sodium chloride improved considerably the strength properties of the lime-treated organic clay. The microstructural analysis also confirmed the presence of calcium silicate hydrate in a salttreated organic clay, which was the main contributing factor to the enhanced engineering properties of the clay.

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“…Transitional soil behaviour is characterised by non-unique CSL, their locations being highly dependent on the initial void ratio (e 0 ). Mixed grading and structured soils are the most susceptible to developing transitional soil behaviour [29][30][31][32][33][34]. These particular soils have characteristics, including the evolution of GSD during testing, which results in different tests paths that do not tend to a unique CSL, as with conventional soils-this is not consistent with the CSSM framework.…”

Section: Transitional Soil Behaviourmentioning

confidence: 99%

Recommended Procedures to Assess Critical State Locus from Triaxial Tests in Cohesionless Remoulded Samples

2021

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The critical state theory is a robust conceptual framework for the characterisation of soil behaviour. In the laboratory, triaxial tests are used to assess the critical state locus. In the last decades, the equipment and testing procedures for soil characterisation, within the critical state framework, have advanced to obtain accurate and reliable results. This review paper summarises and describes a series of recommended laboratory procedures to assess the critical state locus in cohesionless soils. For this purpose, results obtained in the laboratory from different cohesionless soils and triaxial equipment configurations are compiled, analysed and discussed in detail. The procedures presented in this paper reinforce the use of triaxial cells with lubricated end platens and an embedded connection piston into the top-cap, together with the verification of the full saturation condition and the measurement end-of-test water content—preferable using the soil freezing technique. The experimental evidence and comparison between equipment configurations provide relevant insights about the laboratory procedures for obtaining a reliable characterisation of the critical state locus of cohesionless geomaterials. All the procedures recommended herein can be easily implemented in academic and commercial geotechnical laboratories.

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The role of cementation in the behaviour of cemented soils

Cited by 45 publications

References 76 publications

Strain Rate‐Dependent Hardening‐Softening Characteristics of Gas Hydrate‐Bearing Sediments

Strain Rate‐Dependent Hardening‐Softening Characteristics of Gas Hydrate‐Bearing Sediments

Strength improvement of lime-treated clay with sodium chloride

Recommended Procedures to Assess Critical State Locus from Triaxial Tests in Cohesionless Remoulded Samples

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