Mechanical response of saturated and unsaturated gravels of different sizes in drained triaxial testing

Alhani, Israa J.; Noor, Mohd Jamaludin bin Md; Al-Bared, Mohammed Ali Mohammed; Harahap, Indra Sati Hamonangan; Albadri, Wael M.

doi:10.1007/s11440-020-00954-4

Cited by 22 publications

(3 citation statements)

References 52 publications

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“…Through conducting direct shear tests on mixture of sand (0-2 mm) and gravel (2-6 mm, 2-20 mm), Simoni and Houlsby (2006) and Hubler et al (2014) noticed that material with larger grains showed a higher value of constant volume friction angle. For parameters such as internal friction angle, mobilized internal friction angle, and elastic moduli, similar conclusions were also presented by other researchers (Sitharam and Nimbkar 2000;Ahad and Mirghasemi 2009;Meng et al 2018;Alhani et al 2020).…”

Section: Responsible Editor: Zeynal Abiddin Ergulersupporting

confidence: 88%

Evaluation of rock size on the mechanical behavior and deformation performance of soil-rock mixture: a meso-scale numerical and theoretical study

Zhang

2021

Arab J Geosci

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Rock size has a significant impact on the mechanical behavior and deformation performance of soil-rock mixture. This paper aims at investigating and isolating the effect of rock size on the soil-rock mixture in mechanical behavior and deformation behavior and making clear how this factor influences them. Taking the material heterogeneity into account, a two-dimensional meso-scale numerical method for modeling soil-rock mixture is presented, which considers the rocks and soil matrix as separate constituents. Based on the comparison of stress-strain relationships between the numerical simulations and laboratory tests, it is validated that the meso-scale model could describe the macroscopic mechanical behavior of soil-rock mixture well. Then, using the meso-scale method, 160 groups of simulations on soil-rock mixture with different rock sizes under different rock contents are carried out. The shear strength and deformation performance of soil-rock mixture are explored, and their variation laws with rock sizes are discussed subsequently. The simulation results indicate that the soil-rock mixture samples with smaller rocks exhibit a higher peak shear strength, which shows a linear changing trend with rock size. There are no significant changes that took place in the initial elastic modulus under different rock sizes. However, the shear failure modes will present three types as tympany, necking, and cross shear band with the change of rock size. Finally, the influence mechanism of rock size on SRM shear strength and deformation performance is analyzed theoretically.

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Section: Responsible Editor: Zeynal Abiddin Ergulersupporting

confidence: 88%

Evaluation of rock size on the mechanical behavior and deformation performance of soil-rock mixture: a meso-scale numerical and theoretical study

Zhang

2021

Arab J Geosci

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“…The gradation of aggregate plays a vital role in providing the required particlesinterlocking and determining the packing order of the particles. It also affects the shear strength, stiffness, load-carrying capacity and the permanent deformation characteristics [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Breakage on Strength Characteristics of Limestone Aggregate

Alhani¹,

Albadri

Noor

et al. 2022

Geotech Geol Eng

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Particle breakage is one of the issues that significantly affect the strength characteristics of aggregate. In this paper, the strength of pre-crushed limestone aggregate was evaluated through investigating the friction angle, stress-strain behaviour, and single-particle strength. The particle breakage phenomenon was studied for samples prepared at different conditions, including non-soaked samples, water-soaked samples, and acidsoaked samples. The purpose of preparing the samples at different conditions was to simulate the effect of environmental factors on the breakage behaviour of limestone aggregate. The test program of this paper consists of two phases of triaxial tests: the initial shearing and second shearing. The test results showed remarkable variations among the samples since limestone aggregate tended to experience more particle breakage after being soaked in water and acid solution. Also, the volume change results exhibited an increase in dilation as the breakage index increases. The test results of this study presented the importance of considering the role of environmental factors in evaluating the particle breakage of limestone aggregate.

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“…Simoni et al(2006) indicated that sample with a larger size rock has a greater constant volume friction angle. Alhani et al (2020) performed a series of consolidation drained triaxial tests of the gravel soil with various gravel sizes, and the results show that the particle size affects the strength characteristics in a favorable way. Other studies have also come to a similar conclusion (Chu et al, 2019;Yao et al, 2018;Ueda et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

A prediction method for the uniaxial compressive strength of the soil-rock mixture considering the effect of the particle size

Zhu

Yuan

et al. 2022

Preprint

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The reasonable prediction of mechanical parameters of the soil-rock mixture (S-RM) is crucial to build an engineering structure on the deposit slope. As a typical multiphase geomaterial, the emergence of rock blocks of various sizes destroys the integrity of the soil matrix and results in the complex and varied mechanical properties because of its interaction with the soil matrix. Because of the size effect, which is caused by the size restriction of traditional test apparatus, it is more challenging to measure the precise mechanical parameters of S-RM. This study proposed an approach to predicting the uniaxial compressive strength (UCS) of S-RM taking the particle size effect into account. The impact of the particle size on the mechanical behaviors of S-RM under various volumetric rock block proportion (VBP) conditions was discussed using the particle flow discrete element method from both a macroscopic and mesoscopic view. The parameter “Am” was used to describe the decreasing rate of UCS with various VBPs, and a quantitative description to predict the parameter “Am” of S-RM with various maximum particle sizes was proposed. A method to predict the UCS value of S-RM with various VBPs was conducted while taking the influence of size effect into account using the parameter “Am” and the UCS of the soil matrix.

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Mechanical response of saturated and unsaturated gravels of different sizes in drained triaxial testing

Cited by 22 publications

References 52 publications

Evaluation of rock size on the mechanical behavior and deformation performance of soil-rock mixture: a meso-scale numerical and theoretical study

Evaluation of rock size on the mechanical behavior and deformation performance of soil-rock mixture: a meso-scale numerical and theoretical study

Effect of Particle Breakage on Strength Characteristics of Limestone Aggregate

A prediction method for the uniaxial compressive strength of the soil-rock mixture considering the effect of the particle size

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