Modeling humidity and stress-dependent subgrade soils in flexible pavements

Peng, Junhui; Zhang, Junhui; Li, Jue; Yao, Yongsheng; Zhang, Anshun

doi:10.1016/j.compgeo.2019.103413

Cited by 64 publications

(27 citation statements)

References 25 publications

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“…Mechanical strength of RAM mainly depends on the particle friction, aggregate lithology, and performances of the asphalt. us, different gradation design and composition of aggregates affect mechanical properties of RAM obviously [30,31]. e main indexes are compressive strength, resilient modulus, and splitting tensile strength.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Performance Evaluation of Recycled Asphalt Mixtures Containing Construction and Demolition Waste Applicated as Pavement Base

Ding

Zhang

Feng

et al. 2020

Advances in Civil Engineering

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Construction and demolition waste contain large amount of concrete and bricks. To identify its feasibility of applying in asphalt stabilized gravel mixtures as pavement base, this paper carried out researches on properties of recycled asphalt mixture (RAM) by laboratory testing, under different contents of recycled aggregates (RA) and proportions of bricks to concrete. First, the basic physical properties of each component of the RAM were determined. According to the actual screening passing rate, the Bailey method was used to design and verify the grading of RAM, and then initial asphalt content was estimated. The stability, flow value, voidage, and bulk density were obtained by Marshall Test, and the optimal asphalt-aggregate ratios were determined under different RA contents and proportion of bricks to concrete. Subsequently, the uniaxial compression test, splitting tensile test, immersion Marshall test, freeze-thaw splitting test, and Hamburg rutting test were performed to investigate mechanical properties, water stability, and high-temperature stability of RAM. The results shows that as the content of RA increases from 0% to 100%, the corresponding compressive strength, resilient modulus, and splitting tensile strength all decrease; the same change trend is presented in the residual stability and freeze-thaw splitting test strength ratio and rutting depth. According to the requirement of pavement base of high-grade roads in China’s standards, the recommended RA content and proportion of bricks to concrete were proposed for the design RAM.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Performance Evaluation of Recycled Asphalt Mixtures Containing Construction and Demolition Waste Applicated as Pavement Base

Ding

Zhang

Feng

et al. 2020

Advances in Civil Engineering

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“…In flexible pavements, the resilient behavior of SRM plays a key role on the performance of pavement structure. SRM is used extensively as a cheap and abundant roadbed filler, which provides sufficient stiffness, strength and stability for high-quality pavement structure carrying their own weight and traffic loads [15]. The resilient modulus (M R ) of subgrade materials has been employed by the current mechanistic-empirical pavement design guide (MEPDG) [16] as the primary mechanical parameter for calculating the dynamic deflection of its top surface; the deflection is widely considered as the main factor to cause early pavement damage, such as rutting and cracking [17].…”

Section: Introductionmentioning

confidence: 99%

Resilient Properties of Soil-Rock Mixture Materials: Preliminary Investigation of the Effect of Composition and Structure

Qian

Yao

et al. 2020

Materials

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The physical composition and stress state of soil-rock mixture (SRM) materials have a crucial influence on their mechanical properties, and play a vital role in improving the performance of subgrade. To reveal the resilient behavior and mesostructure evolution of SRM materials, triaxial tests and discrete element method (DEM) numerical analysis have been carried out. In the triaxial test section, the mechanical response of SRM materials was investigated by preparing samples under different stress states and physical states and conducting triaxial tests on samples. Simultaneously, a new irregular particle modeling method was developed and applied to the discrete element modeling process to analyze the mesostructure evolution of SRM materials under cycling loading. First, a cyclic triaxial test of SRM material is performed on the SRM material, and the effects of bulk stress, octahedral shear stress and rock content on the resilient modulus of the SRM material are analyzed. It is revealed that the resilient modulus increases with increasing bulk stress and rock content, and decreases with increasing octahedral shear stress. Based on a new resilient modulus prediction model, the relationships among the rock content, stress state and resilient modulus are established. Then, based on an improved DEM modeling method, a discrete element model of the SRM is established, and the influence of rock content on coordination number and mesostructure evolution of the SRM is analyzed. The results show that in SRM materials, the increase of crushed rock changes the mesostructure of the SRM material. With the increase of rock content, the internal contact force changes from “between soil and rock” to “between rocks”, and the skeleton formed in the rocks gradually develops overall stiffness. Under the condition of low stress, the anisotropy of the SRM material is mainly caused by the shape and grade distribution of crushed rock. The induced anisotropy caused by the change of stress state has little effect on its mechanical behavior, which may lead to the greater dispersion of multiple SRM test results.

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“…Rockfill is a common engineering material that is largely used in railway, transportation, and highway roadbeds construction projects due to its high filling density, strong permeability, good compacting performance, and high strength. Studying more about the stress, strain, and deformation characteristics of rockfill materials under various loads in detail and establishing a reasonable and effective constitutive model were of great significance to the theoretical analysis of rockfill engineering application and the numerical calculation and analysis of transportation geotechnics [1][2][3]. e constitutive relationship is not only the core of modern soil mechanics, but also an important entry point for studying the mechanical properties of rockfill materials.…”

Section: Introductionmentioning

confidence: 99%

The Constitutive Model of Rockfill Based on Property‐Dependent Plastic Potential Theory for Geomaterials

Zhang

et al. 2020

Advances in Civil Engineering

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To better control the strength and deformation of the roadbed, a constitutive model of rockfill was established based on property-dependent plastic potential theory for geomaterials. The effect of the particle gradation on the anisotropy was described in the model. According to the effect of the particle grading and crushing on the fractal dimension, the fractal theory and fabric tensor were introduced to establish the yield and failure criteria of the rockfill. By combining the property-dependent concepts of the materials and the results of the rockfill strength test, a critical state line considering the microstructure, fractal dimension, particle breakage, and stress state of the rockfill was established. The dilatancy equation was derived based on the novel potential theory and the hardening criterion affected by the critical state was established. A constitutive model of the rockfill in the general stress space was established under the framework of the novel potential theory. The 3D strength and its intensity change in the π plane were simulated through the drainage strength test results, which verified the description of the critical state under various stress paths. By simulating the stress-strain relationship, the validity and rationality of the model were verified.

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Modeling humidity and stress-dependent subgrade soils in flexible pavements

Cited by 64 publications

References 25 publications

Performance Evaluation of Recycled Asphalt Mixtures Containing Construction and Demolition Waste Applicated as Pavement Base

Performance Evaluation of Recycled Asphalt Mixtures Containing Construction and Demolition Waste Applicated as Pavement Base

Resilient Properties of Soil-Rock Mixture Materials: Preliminary Investigation of the Effect of Composition and Structure

The Constitutive Model of Rockfill Based on Property‐Dependent Plastic Potential Theory for Geomaterials

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