Yielding of rockfill in relative humidity-controlled triaxial experiments

Alonso, Eduardo E.; Romero, E.; Ortega, Enrique

doi:10.1007/s11440-016-0437-9

Cited by 52 publications

(12 citation statements)

References 48 publications

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“…This state-dependent behaviour was also observed in the triaxial tests on rockfill materials used in Guanyinyan dam that will be introduced in the next section. Furthermore, compared with the fully saturated rockfill materials, a more obvious state-dependent behaviour was observed for unsaturated rockfills in the relative humidity-controlled triaxial tests [7,16]. The rockfills subjected to the larger suction exhibited more remarkable strain-softening and dilatancy at a low confining pressure or with a small initial void ratio.…”

Section: Introductionmentioning

confidence: 95%

A State-Dependent Constitutive Model for Unsaturated Rockfill Materials

Wang¹,

Fu²

2021

Dam Engineering - Recent Advances in Design and Analysis

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This chapter presents a state-dependent elastoplastic constitutive model for both saturated and unsaturated rockfill materials. The model, which is developed within an extended critical-state framework, uses two independent stress state variables: total stress and total suction. The loading-collapse (LC) curve proposed by Oldecop and Alonso for unsaturated rockfills is used herein. A unified hardening parameter, which could consider the effects of stress level, internal state (density) and relative humidity, is introduced to describe the state-dependent dilatancy of saturated and unsaturated rockfill materials. The details of the model formulation and parameters determination are described and reported. Numerical simulations on the triaxial tests, such as the drained shear tests on the saturated specimens with different initial dry densities, shear tests on the specimens with different relative humidity and wetting deformation tests under constant vertical strain rate, have been carried out using the proposed model. The numerical results show that the stress-strain relationships at both loose and dense, saturated and unsaturated states can be properly modelled with a single set of parameters. Additionally, the proposed model can also capture some other key features such as the strain-softening behaviour at the dense state and low confining stress, the sudden stress relaxing subjected to the flooding under a constant vertical strain.

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Section: Introductionmentioning

confidence: 95%

A State-Dependent Constitutive Model for Unsaturated Rockfill Materials

Wang¹,

Fu²

2021

Dam Engineering - Recent Advances in Design and Analysis

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“…Compared with the abundant creep tests performed with various sands (Kuwano and Jardine 2002;Lade et al 2009;Karimpour and Lade 2010;Karimpour and Lade 2013), experiments on the time-dependent behavior of rockfill materials are considerably less (AnhDan et al 2006;Zhang et al 2017;Alonso et al 2016;Fu et al 2018b). However, it is reasonable to postulate that the time-dependent behavior of rockfill materials is similar to that of sands.…”

Section: Previous Experimental Observationsmentioning

confidence: 99%

“…Particle breakage may also occur under a constant stress state in a delayed manner, leading to the so-called creep strains (Oldecop and Alonso 2007;Zhang et al 2017;Lade et al 2009;Kwok and Bolton 2013;Karimpour and Lade 2010;Fu et al 2018a). For a particular rockfill, the amount of creep strains depends not only on the packing density (Bauer et al 2012) and the moisture content (Alonso et al 2016;Bauer 2009), but also on the stress state (Cheng and Ding 2004;Fu et al 2018a) and the stress history (Zhang et al 2017;Lade et al 2009). On the other hand, the deformation behavior of materials during loading may also be altered by previous creep histories, i.e.…”

Section: Introductionmentioning

confidence: 99%

Modeling interaction between loading-induced and creep strains of rockfill materials using a hardening elastoplastic constitutive model

Chen

Zhong

et al. 2019

Can. Geotech. J.

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An elastoplastic constitutive model that takes into account the stress–strain relationship and creep-induced hardening behavior of rockfill materials is proposed in light of previous experimental observations. It is assumed that the mechanical response during loading and the final amounts of creep strains under a constant stress state are independent of the strain rate. The focus of the proposed model is the coupling effect between loading and creep, including the influence of loading history on subsequent creep strains and the influence of creep history on subsequent loading behavior. An extended yield function, which allows flexible control over the shape of yield surfaces, is used not only to distinguish among loading, unloading, and neutral loading, but also to manipulate the creep-induced hardening using a plastic strains–based hardening parameter. A stress-dependent dilatancy equation is used, instead of a plastic potential function, to define the directions of plastic strains during loading. The hardening law is established based on three different types of experimental results. Only routine experiments are required for calibration of model parameters, and the model can be used in a reduced form according to the available test results. The model is verified using typical experimental data and is found to be capable of capturing important behavior of rockfill materials, such as pressure-dependent strength, shear contraction and dilation, and creep-induced stiffening.

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“…Past research has established that grain crushing is influenced by many factors. These factors are ranged from soil grain characteristics such as soil particle strength (Varadarajan et al 2006) angularity and morphology (Karatza et al, 2019;Xiao et al, 2019), or soil matrix properties such as gradation (Honkanadavar and Sharma, 2014), porosity (Hyodo et al, 2016), and moisture content (Alonso et al, 2016), and anisotropy (Hattamleh et al 2010, Hattamleh et al 2013) and external factors such as induced stress (Hattamleh et al 2010), loading duration (Fu et al, 2019), and loading rate (Huang et al, 2017 and;Parab et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effect of the Quasi Rate of Loading in Particle Crushing and Engineering Properties of Black Tough Sand

Hattamleh

Sharo

Shanab

et al. 2021

Preprint

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In this study, the effect of the quasi rate of loading in the crushing of black tough sand will be studied experimentally. The experimental works will be conducted at different normal stresses, different relative densities, and different rates of loading using the direct shear tests. All test specimens were prepared with uniformly graded sand, passing sieve #4, and retained sieve #8.The results of direct shear tests were used to investigate the factors influencing the amount of particle breakage and consequently the friction angle. After shearing of each specimen, sieve analysis was performed in order to determine the percentage of particle breakage. Results showed that the rate of loading in direct shear plays a significant role in the amount of crushing and in internal friction angles. The amount of crushing as well as shear strength was increased with the increased rate of loading. Moreover, microstructural analysis used scanning electron microscopy (SEM) analysis shown that the crushing from granular have primarily resulted from disintegration, grinding and abrasion of particles.

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Yielding of rockfill in relative humidity-controlled triaxial experiments

Cited by 52 publications

References 48 publications

A State-Dependent Constitutive Model for Unsaturated Rockfill Materials

A State-Dependent Constitutive Model for Unsaturated Rockfill Materials

Modeling interaction between loading-induced and creep strains of rockfill materials using a hardening elastoplastic constitutive model

Effect of the Quasi Rate of Loading in Particle Crushing and Engineering Properties of Black Tough Sand

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