Numerical Analysis of Shear and Particle Crushing Characteristics in Ring Shear System Using the PFC2D

Jeong, Sangbae; Kighuta, Kabuyaya; Lee, Dong‐Eun; Park, Sung-Sik

doi:10.3390/ma14010229

Cited by 7 publications

(6 citation statements)

References 34 publications

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“…The PFC particle program analyzes the change in force and displacement of each particle, calculates each particle's displacement according to Newton's second law, and then generates an overall model of the internal distribution of stress-strain, crack extension, and other rules of change. Figure 17 displays the PFC model solution procedure [35][36]. the instant o t may be calculated using Newton's second law, and they are, respectively:…”

Section: Software Calculation Principlesmentioning

confidence: 99%

Mechanism of Hard Rock Static Blasting-induced Crack Expansion

Cao

et al. 2023

Preprint

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How to deal with hard rock cheaply and safely is a pressing issue in today's coal mining. Weakening fractures in hard rock have always been a significant concern in China's coal mine engineering. In this study, the mechanism of a crusher fracturing hard rock is examined from a mechanical standpoint based on the static crusher component action and the expansion mechanism of the hydration reaction. It is assumed that single-hole fracturing is divided into three fracturing stages: the microfracture stage, the fissure development stage, and the rupture stage. It was determined that the expansion pressure of SCA increased with the increase in hole diameter under the hole diameter range of 30 mm-45 mm, and the range of the expansion pressure was 43.5 MPa-75.1 MPa; the reasonable use of SCA was summarized; and the expansion and fracturing properties of SCA were quantitatively analyzed based on the expansion pressure test and single-hole specimen fracturing experiments; Three fractures, typically in the form of "D-type damage, were the hallmark of expansion cracking in single-hole specimens. SAC cracking began later, but the breaking rate was still rather significant. PFC2D was used to mimic the expansion fracturing of a single-hole specimen without peripheral pressure, which matched the experimental fracturing result and demonstrated the viability of using PFC to replicate SAC fracturing. Analysis of double-hole specimens with varying hole diameters, hole spacings, and circumferential pressures under expansion revealed that the hole diameters were positively correlated with the cracking effect, the hole spacings and circumferential pressures were negatively correlated with the cracking effect, and the hole diameters were also positively correlated with the crack extension and distribution characteristics. Combining the findings from experimental and numerical research, it can be said that the pore size of SCA plays a dominating role in the fracturing impact and that the second largest influences are pore spacing and surrounding pressure.

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Section: Software Calculation Principlesmentioning

confidence: 99%

Mechanism of Hard Rock Static Blasting-induced Crack Expansion

Cao

et al. 2023

Preprint

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“…The shear and particle-crushing characteristics of the failure plane (or shear surface) in catastrophic mass movements are examined with a ring shear apparatus, which is generally employed owing to its suitability for large deformations [ 45 ]. Based on the results of previous experiments on waste materials from abandoned mine deposits, we employed a simple numerical model based on ring shear testing using the particle flow code (PFC 2D ).…”

Section: Description Of the Articles Presented In The Issuementioning

confidence: 99%

“…The frictional work at peak and the residual shear stresses ranged from 303 kPa·s to 2579 kPa·s for the given drainage and normal stress conditions. These results showed that clump particles were partially crushed at peak shear stress [ 45 ].…”

Section: Description Of the Articles Presented In The Issuementioning

confidence: 99%

Testing of Materials and Elements in Civil Engineering

Schabowicz

2021

Materials

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This issue is proposed and organized as a means to present recent developments in the field of testing of materials in civil engineering. For this reason, the articles highlighted in this issue should relate to different aspects of testing of different materials in civil engineering, from building materials and elements to building structures. The current trend in the development of materials testing in civil engineering is mainly concerned with the detection of flaws and defects in elements and structures using destructive, semi-destructive, and nondestructive testing. The trend, as in medicine, is toward designing test equipment that allows one to obtain a picture of the inside of the tested element and materials. Very interesting results with significance for building practices of testing of materials and elements in civil engineering were obtained.

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“…Several researchers have conducted calibration chamber and centrifuge tests on carbonate sands to better understand what happens when a pile is driven into weak sands [ 5 , 6 , 7 , 8 ]. This phenomenon has also attracted many researchers to conduct laboratory tests to study the influence of particle breakage on the critical state behaviors, shear stress ratios and dilatancy of granular soils [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ] as well as numerical modeling [ 14 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, studies of direct shear tests at the microscopic level have become more popular using the Discrete Element Method among others by [ 14 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. Seyyedan et al [ 29 ] employed a novel approach that combined the Discrete Element Method (DEM) and Extended Finite Element Method (XFEM) to conduct numerical simulations of direct shear tests.…”

Section: Introductionmentioning

confidence: 99%

3D DEM Analysis of Particle Breakage Effect on Direct Shear Tests of Coarse Sand

2023

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This paper explores the effect of particle breakage on the mechanical behavior of coarse sand through 3D Discrete Element Method (DEM) simulations of direct shear tests (DST). The objective is to gain insights into the macro- and micro-mechanical behaviors of crushable coarse sand, with a particular focus on the stress–strain relationship, volumetric deformation, and evolution of grain crushing. The simulations involve a comparison between non-crushable and crushable particle models, where the crushable particles are implemented in the shear zone of the DST subjected to different high normal stresses. The findings indicate that the crushable particles experience partial crushing at peak shear stress, with further particle crushing leading to the production of finer particles at the shearing plane during shearing at the critical state. The migration of these finer particles under pressure and gravity generates their accumulation predominantly in the lower section of the simulation box. Importantly, the presence of crushing in the DST induces a decrease in the shear stress and an increase in the volumetric strain leading to contractive behavior instead of dilation, which gradually stabilizes the volumetric deformation at higher normal stresses.

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Numerical Analysis of Shear and Particle Crushing Characteristics in Ring Shear System Using the PFC2D

Cited by 7 publications

References 34 publications

Mechanism of Hard Rock Static Blasting-induced Crack Expansion

Mechanism of Hard Rock Static Blasting-induced Crack Expansion

Testing of Materials and Elements in Civil Engineering

3D DEM Analysis of Particle Breakage Effect on Direct Shear Tests of Coarse Sand

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