Representative elementary volume of mechanical parameter of rockfill material with laboratory scaled gradation

doi:10.3785/j.issn.1008-973X.2023.07.017

Journal of ZheJiang University (Engineering Science)

2023, Vol. 57

Issue (7): 1418-1427 DOI: 10.3785/j.issn.1008-973X.2023.07.017

Representative elementary volume of mechanical parameter of rockfill material with laboratory scaled gradation

Jin-wei WANG1,2(

),Shi-chun CHI1,2,*(

),Shi-hao YAN1,2,Yu GUO1,2,Xin-jie ZHOU1,2

1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
2. School of Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China

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Abstract

The discrete element method (DEM) was used to analyze the effect of specimen size on the mechanical behavior of basalt rockfill materials in order to find the representative elementary volume (REV) of the strength and deformation parameters of the rockfill materials with laboratory scaled gradation. Laboratory single-particle crushing tests were conducted to analyze the crushing characteristics of basalt particles and determine the particle crushing strength parameters required for DEM simulations. A series of triaxial compression DEM tests with different specimen sizes, particle arrangements and confining pressures were conducted. The variations of strength and deformation parameters with specimen size were analyzed for rockfill materials, and the REV of each parameter was assessed. Results show that particle arrangement and specimen size both impact the mechanical behavior of basalt rockfill materials. The variation coefficient of each mechanical parameter decreases as specimen size increases. The REV size of different mechanical parameters is different. The appropriate specimen size can be selected according to the research object in order to improve the calculation efficiency of DEM. The size of the numerical sample should not be less than 300 mm in diameter and 600 mm in height in order to make all parameters stable under the simulated conditions.

Key words： rockfill material representative elementary volume discrete element method (DEM) specimen size effect particle breakage

Received: 02 August 2022 Published: 17 July 2023

CLC:

TV 41

Fund: 国家重点研发计划资助项目（2016YFB0201001）

Corresponding Authors: Shi-chun CHI E-mail: wangjwxkl@163.com;schchi@dlut.edu.cn

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Cite this article:

Jin-wei WANG,Shi-chun CHI,Shi-hao YAN,Yu GUO,Xin-jie ZHOU. Representative elementary volume of mechanical parameter of rockfill material with laboratory scaled gradation. Journal of ZheJiang University (Engineering Science), 2023, 57(7): 1418-1427.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.07.017 OR https://www.zjujournals.com/eng/Y2023/V57/I7/1418

室内缩尺级配堆石料力学参数的表征单元体积

为了寻找室内缩尺级配堆石料强度和变形参数的表征单元体积（REV），利用离散元方法（DEM）研究试样尺寸对玄武岩堆石料力学行为的影响. 通过室内单颗粒破碎试验，分析玄武岩颗粒的破碎特性，确定DEM模拟所需的颗粒破碎强度参数. 开展一系列试样尺寸、颗粒排列和围压不同的三轴压缩DEM试验. 分析堆石料强度和变形参数随试样尺寸的变化规律，建议了各参数的REV. 结果表明，颗粒排列和试样尺寸均会影响堆石料的力学行为. 各力学参数的变异系数随着试样尺寸的增大而减小. 不同力学参数的REV尺寸不同，为了提高DEM计算效率，可以根据研究对象选择合适的试样尺寸. 在模拟工况下，要使所有参数均达到稳定，数值试样尺寸应不小于直径300 mm×高度600 mm.

关键词： 堆石料, 表征单元体积, 离散元方法(DEM), 试样尺寸效应, 颗粒破碎

Fig.1 Particle crushing apparatus and particles before and after crushing

Fig.2 Relation between strength and survival probability for basalt particles

Tab.1 Weibull fitting parameters

Fig.3 Characteristic strength as function of particle size for basalt particles

Fig.4 Replacement mechanism for particle crushing^[28]

Fig.5 Particle grading curves

Fig.6 Stress-strain curves for different fracture limit sizes

Fig.7 Comparison between DEM results and laboratory tests of basalt rockfill materials

Tab.2 DEM parameters

Fig.8 Schematic diagram of numerical specimens with different sizes and particle arrangements

Fig.9 Stress-strain curves for specimens of different sizes and particle arrangements at confining pressure of 2 000 kPa

Fig.10 Stress-strain-volume relation of rockfill materials in conventional triaxial test

Fig.11 Evolution of peak strength and its coefficient of variation with specimen size

Fig.12 Statistical results of φ₀和

$\Delta \varphi $

Fig.13 Evolution of secant modulus and its coefficient of variation with specimen size

Fig.14 Evolution of Poisson ratio and its coefficient of variation with specimen size

Fig.15 Evolution of maximum volumetric compressive strain and its coefficient of variation with specimen size


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