Parameter estimation approach for particle flow model of rockfill materials using response surface method

Li, Shouju; Li, De; Cao, Lijuan; Shangguan, Zichang

doi:10.1142/s2047684115500037

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…The test apparatus includes cylindrical vessel and two top and bottom horizontal plates [16]. Particle compaction and axial and confining pressure are applied by the movement of the plates and the cylindrical vessel [17]. The geometry of cylindrical vessel is composed of 20 triangular segments called facets.…”

Section: Simulation Of Triaxial Compression Testmentioning

confidence: 99%

The Effect of Traffic on Ballast Settlement

Gebremariam¹,

Alamnie²

2021

JTTs

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Section: Simulation Of Triaxial Compression Testmentioning

confidence: 99%

The Effect of Traffic on Ballast Settlement

Gebremariam¹,

Alamnie²

2021

JTTs

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“…Considering that the soil void is almost a circle in the horizontal section, the natural balanced soil arch can be simplified to be a rotary surface. Therefore, the following assumptions are made to determine the shape of the natural balanced soil arch of karst collapse [Dey and Karmakar, 2012;Li et al, 2015]:…”

Section: Calculation Of the Shape And Limit Height Of The Natural Balmentioning

confidence: 99%

Modeling cover-collapse sinkhole based on the theory of shells

Liu

Zhou

et al. 2019

Int. J. Comp. Mat. Sci. Eng.

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The shape and height of a natural balanced soil arch are two of the critical factors for the development of a sinkhole. The exposure of the natural balanced soil arch can be described as the initiation of the surface-collapse phase of the cover-collapse sinkhole in karst terrain. In this paper, by simplifying the natural balanced soil arch as a thin shell in a limit equilibrium state, a theoretical model is developed using the nonmoment theory of rotary shells with the shape and height of the natural balanced soil arch derived based on the Protodyakonov’s theory. First, the developed model is validated using a case study (a cover-collapse sinkhole occurred in Guizhou, China). It demonstrates that the shell theory used in this study can describe the equilibrium state of a natural balanced soil arch reasonably well. After model validation, a series of numerical simulations are then carried out to investigate the critical factors which govern the collapse of a sinkhole. The results show that buried depth serves as a compulsory condition for the formation of the natural balanced soil arch. Furthermore, it shows that a buried depth less than six times of the radius of a cave could result in the formation of a natural balanced soil arch in the cone surface.

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“…The DEM simulation of high pressure triaxial tests on crushable sand using the octahedral shear stress as fracture criterion showed also that particle crushing is essential to reproduce the realistic behaviour of sand in particular the volumetric contraction in high-pressure shear tests, de Bono [34] showed also that the shear box results were influenced by the contact stiffness and friction coefficient. Li et al [35] made use of triaxial compression tests and a calibration procedure based on a response surface method to determine the normal stiffness, the shear stiffness and the friction coefficient of rock fill material by means of Particle Flow Code (PFC).…”

Section: Introductionmentioning

confidence: 99%

Experiments and 3D DEM of Triaxial Compression Tests under Special Consideration of Particle Stiffness

Ahlinhan¹,

Houehanou²,

Koube³

et al. 2018

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Discrete element modelling is commonly used for particle-scale modelling of granular or particulate materials. Developing a DEM model requires the determination of a number of micro-structural parameters, including the particle contact stiffness and the particle-particle friction. These parameters cannot easily be measured in the laboratory or directly related to measurable, physical material parameters. Therefore, a calibration process is typically used to determine the values for use in simulations of physical systems. This paper focuses on how to define the particle stiffness for the discrete element modelling in order to perform realistic simulations of granular materials in the case of linear contact model. For that, laboratory tests and numerical discrete element modelling of triaxial compression tests have been carried out on two different non-cohesive soils i.e. poorly graded fine sand and gap graded coarse sand. The results of experimental tests are used to calibrate the numerical model. It is found that the numerical results are qualitatively and quantitatively in good agreement with the laboratory tests results. Moreover, the results show that the stress dependent of soil behaviour can be reproduced well by assigning the particle stiffness as a function of the particle size particularly for gap graded soil.

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Parameter estimation approach for particle flow model of rockfill materials using response surface method

Cited by 5 publications

References 19 publications

The Effect of Traffic on Ballast Settlement

The Effect of Traffic on Ballast Settlement

Modeling cover-collapse sinkhole based on the theory of shells

Experiments and 3D DEM of Triaxial Compression Tests under Special Consideration of Particle Stiffness

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