A Constitutive Model that Incorporates the Effect of Suction in Cemented Geological Materials

Garitte, Benoit; Vaunat, Jean; Gens, Antonio

doi:10.1061/40802(189)164

Cited by 9 publications

(9 citation statements)

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“…It is now well accepted that the mechanical response of a bonded material under unsaturated conditions may be substantially different than that under saturated conditions (Garitte et al 2006). Suction will often influence the mechanical properties of a bonded material.…”

Section: Influence Of the Unsaturated Conditionmentioning

confidence: 99%

Numerical Implementation of a Critical State Model for Soft Rocks

Lloret-Cabot¹,

Pineda²,

Sheng³

2018

PanAm Unsaturated Soils 2017

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This paper details the basic tasks for the numerical implementation of a simple elasto-plastic critical state model for bonded materials (i.e. soft rocks-hard soils) into the finite element program SNAC developed at the University of Newcastle in Australia. The first task described focusses on the derivation of the incremental constitutive relationships used to represent the mechanical response of a bonded/cemented material under saturated conditions. The second task presents how these stress-strain relations can be numerically integrated using an explicit substepping scheme with automatic error control. The third task concentrates on the verification of the substepping algorithm proposed. The model used to represent the saturated mechanical response of a bonded material combines the modified Cam clay with the constitutive relationships for cemented materials proposed in Gens & Nova (1993), but incorporates some flexibility on the degradation law adopted. The role of suction and other relevant aspects of unsaturated behaviour are also discussed at the end of the paper.

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Section: Influence Of the Unsaturated Conditionmentioning

confidence: 99%

Numerical Implementation of a Critical State Model for Soft Rocks

Lloret-Cabot¹,

Pineda²,

Sheng³

2018

PanAm Unsaturated Soils 2017

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“…Despite the above-mentioned considerable advances in constitutive modelling, there are still few models able to capture the combined effects of structure-related bonding and partial saturation [9,24,36,42,46,62,70]. For this, in the following, a relatively simple model accounting for both structure degradation and partial saturation is proposed.…”

Section: Introductionmentioning

confidence: 99%

Unsaturated structured soils: constitutive modelling and stability analyses

2021

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The paper presents a new single-surface elasto-plastic model for unsaturated cemented soils, formulated within the critical state soil mechanics framework, which should be considered as an extension to unsaturated conditions of a recently proposed constitutive law for saturated structured soils. The model has been developed with the main purpose of inspecting the mechanical instabilities induced in natural soils by bond degradation resulting from the accumulation of plastic strains and/or the changes in pore saturation. At this scope, the constitutive equations are used to simulate typical geotechnical testing conditions, whose results are then analysed in light of the controllability theory. The results of triaxial tests on an ideal fully saturated cemented soil and on the corresponding unsaturated uncemented one are first discussed, aiming at detecting the evidence of potentially unstable conditions throughout the numerical simulations. This is followed by similar analyses considering the combined effects of both the above features. For each analysed case, a simple analytical stability criterion is proposed and validated against the numerical results, generalizing the results, and highlighting the crucial role of state variables and model parameters on the possible occurrence of failure conditions.

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“…The behaviour of structured soils is relevant to many civil engineering applications from mining to tunnelling and from road construction to the analysis of landslides [3][4][5]. A feature of structured soils is the presence of inter-particle bonding or cementation, which contributes to their strength and stiffness, and tends to progressively deteriorate as the application of loads damage the bonds between particles [6].…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, other models predict the mechanical behaviour of unsaturated soils without accounting for the effect of cementation [21][22][23][24][25][26][27][28][29]. Only a handful of elastoplastic models account for the combined effects of both cementation and partial saturation on the mechanical behaviour of natural soils [5][6][7][30][31][32]. These models provide, however, a limited description of mechanical hysteresis and introduce unrealistic discontinuities at the transition point between elastic and plastic states.…”

Section: Introductionmentioning

confidence: 99%