Resilient behavior of coarse granular materials in three dimensional anisotropic stress state

Gu, Chunxing; Ye, Xingchi; Cao, Zhigang; Cai, Yuanqiang; Wang, Jun; Zhang, Tingting

doi:10.1016/j.enggeo.2020.105848

Cited by 12 publications

(3 citation statements)

References 35 publications

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“…Interlayers are created by the interpenetration of a base layer and subgrade layer, of which fine content (FC) varies with depth [1][2][3][4]. Variations in FC results in changes in water retention properties [5,6] and soil properties [7][8][9][10][11][12]. In addition, the soil water retention curve (SWRC) has been successfully used in the prediction of the mechanical properties of soil in the unsaturated state, i.e., shear behaviour [13][14][15] and resilient behaviour [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Soil–Water Retention Curves of Road Base Aggregate with Various Clay Fine Contents

Zhang

Cao

et al. 2022

Applied Sciences

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The invasion of clay fines can change the water retention properties of base layers significantly. There is no soil–water retention curve prediction equation that is capable of considering the effects of fines. In this study, the soil–water retention curves (SWRC) of road base aggregate with different fine contents (FC) were measured. The variations in inter-aggregate pores (formed by coarse grains) and intra-aggregate pores (formed by fines) with FC were deduced from the SWRC at different FCs. It was found that the inclusion of fines shifted and scaled the inter-aggregate pore distribution curves and scaled the intra-aggregate pore distribution curves. Based on this finding, a prediction equation for SWRC with consideration of the effects of FC was proposed. The feasibility of this equation was verified by comparing the predicted and measured results. The proposed model can be used to predict the SWRC of soil with different FCs.

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Section: Introductionmentioning

confidence: 99%

Prediction of Soil–Water Retention Curves of Road Base Aggregate with Various Clay Fine Contents

Zhang

Cao

et al. 2022

Applied Sciences

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“…The initial normal stress σ 0 o and deviatoric stress τ o (Chang and Whitman 1988;Lekarp and Dawson 1998;Liu et al 2018;Gu et al 2020), as well as the cyclic stress amplitudes Δσ 0 and Δτ , control the accumulation of volumetric and shear strains (Silver and Seed 1971;Drnevich and Richart 1970;Youd 1972;Cai et al 2015;Klar et al 2019). Various stress ratios defined in terms of normal effective stress σ 0 or p 0 , shear stress τ or q, or stress obliquity η ¼ q=p 0 have been used to analyze experimental results including (p 0 -q quadrant in Fig.…”

Section: Initial Stress and Cyclic Stress Amplitude Loading Historymentioning

confidence: 99%

Long-Term Response of Sand Subjected to Repetitive Simple Shear Loading: Shakedown, Ratcheting, and Terminal Void Ratio

Cha

Park

Santamarina

2023

J. Geotech. Geoenviron. Eng.

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Low-amplitude repetitive drained loading may hinder the long-term performance of engineered and natural systems. This study examines the volumetric and shear response of a uniform quarzitic sand subjected to repetitive drained simple shear loading under constant vertical stress while tracking the evolution of the secant stiffness and the small-strain shear modulus. We explore the effects of initial density, initial shear stress and cyclic shear stress amplitude to identify criteria that can be used to anticipate asymptotic volumetric and shear states. We analyze experimental results in reference to the sand response under monotonic simple shear loading. All specimens evolved toward some asymptotic terminal void ratio e T when subjected to simple shear cycles. Contractive specimens exhibited unceasing shear strain accumulation and ratcheting when the normalized shear stress exceeded τ Ã ¼ ðτ o þ Δτ Þ=τ ult > 0.85; on the other hand, dense-dilative specimens exhibited ratcheting only when the normalized shear stress exceeded τ Ã ¼ ðτ o þ Δτ Þ=τ ult > 1.25. The small-strain G max and the secant G pp shear moduli increased during repetitive shear cycles to reflect early fabric changes followed by abrasion/fretting among enduring contacts. Results obtained in this study allow us to propose simple guidelines to predict the asymptotic shear and volumetric response of uniform sands subjected to repetitive simple shear loading for first-order engineering analyses.

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“…As confining stresses increased, the resilient modulus increased [33]. Gu et al concluded that the cyclic shear stress has a significant effect on resilient stiffness; with low shear stress, the resilient modulus is affected less by principal stresses [34]. The increase in cyclic major principal stress leads to the progress of resilient modulus, and the growing frequency generally decreases with the increasing initial stress ratio [35].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Resilience Characteristics of Unbound Granular Materials for Sustainable Pavements

et al. 2022

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In this study, a comprehensive laboratory testing program was designed to study the resilience characteristics of unbound granular materials (aggregate base coarse) using the repeated load triaxial test (RLTT). During the experimental program, the resilient modulus of unbound granular material was examined using different moisture content levels, material gradation using Fuller’s equation, and stress levels. The results show that the moisture content, material gradation, and stress level have a major influence on the resilient modulus of unbound granular materials. Furthermore, a linear model has been developed between moisture content and the resilient modulus. The model significantly predicts the change in resilient modulus by changing moisture content. The study also aimed to improve the modified Uzan model by adding the effect of moisture content. An improved modified Uzan stress moisture model has been developed, which shows a strong relationship between the resilient modulus, stress, and moisture content. This study can be used as a benchmark for validating other numerical data.

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Resilient behavior of coarse granular materials in three dimensional anisotropic stress state

Cited by 12 publications

References 35 publications

Prediction of Soil–Water Retention Curves of Road Base Aggregate with Various Clay Fine Contents

Prediction of Soil–Water Retention Curves of Road Base Aggregate with Various Clay Fine Contents

Long-Term Response of Sand Subjected to Repetitive Simple Shear Loading: Shakedown, Ratcheting, and Terminal Void Ratio

Investigation of Resilience Characteristics of Unbound Granular Materials for Sustainable Pavements

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