Investigating mechanics of conglomeratic rocks: influence of clast size distribution, scale and properties of clast and interparticle cement

Akram, Mian Sohail; Sharrock, Glenn; Mitra, Rudra

doi:10.1007/s10064-018-1274-x

Cited by 12 publications

(6 citation statements)

References 41 publications

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“…However, they neglected the effect of the contact normal bond strength on the maximum tensile strength. Akram et al [24] discussed the effects of particle distribution and particle size on the uniaxial, triaxial, and Brazilian tensile strength of clastic rocks, but they did not discuss the effect of the contact normal bond strength on the Brazilian tensile strength.…”

Section: State Of the Artmentioning

confidence: 99%

Effects of Contact Normal Bond Strength on Brazilian Tensile Strength by Particle Flow Code

Huang¹,

Fu²,

Miao³

et al. 2020

JESTR

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The Contact Bond Model (CBM) of Particle Flow Code (PFC) can effectively simulate the mechanical behaviours of rocks. The physical and mechanical parameters of CBM directly influence the results of the numerical simulation of rocks. To reveal the influence mechanism of the contact normal bond strength of the CBM on Brazilian tensile strength, this study proposes a numerical test model and calculation method for the Brazilian tensile strength. First, the theoretical relationship between the Brazilian tensile strength and the contact normal bond strength of the CBM was derived. Second, 70 groups (350) of PFC Brazilian disk numerical tests were designed, and a numerical model of the Brazilian tensile strength was established. Third, the effects of the contact normal bond strength on the Brazilian tensile strength under various ball radii and ball radius ratios were analyzed according to the PFC numerical simulation results, and the correctness of the theoretical relation was verified. Results demonstrate that the Brazilian tensile strength is significantly and linearly related to the contact normal bond strength and can be expressed as the product of the contact normal bond strength and the scale coefficient. The scale coefficient is affected by the geometric parameters of balls. The scale coefficient generally increases with the minimum particle size, whereas the change in the coefficient becomes irregular. Results reveal the physical significance of the PFC normal bond strength to a certain extent. The proposed method can determine the contact normal bond strength.

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Section: State Of the Artmentioning

confidence: 99%

Effects of Contact Normal Bond Strength on Brazilian Tensile Strength by Particle Flow Code

Huang¹,

Fu²,

Miao³

et al. 2020

JESTR

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“…Scholars from both China [17][18][19][20][21][22] and abroad [23][24][25][26][27] mainly use finite element and discrete element numerical simulation methods to model the mechanical behavior of glutenite during force loading. Guo et al [17] established an evolutionary function between strength parameters and strain-softening parameters and simulated the dynamic stress-strain behavior of samples with different cement strengths.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on the Prediction of Macroscale Young’s Modulus Based on the Mesoscale Characteristics of Tight Glutenite Reservoirs

Xiao,

Zhang,

Yan

et al. 2024

Processes

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To obtain the macroscale Young’s modulus of glutenite under gravel inclusions, a numerical simulation of macroscale Young’s modulus prediction based on the mesoscale characteristics of glutenite was carried out. Firstly, the micron indentation test was used to obtain the meso-mechanical parameters of gravel and matrix in glutenite to ensure the reasonableness of the numerical simulation parameter settings; secondly, a two-dimensional glutenite physical model generation method based on the secondary development of Python was put forward; and then, the macroscale Young’s modulus variation rule of glutenite under different gravel sizes, particle size ratios, and content characteristics were analyzed using the finite element method (FEM). The results show that Young’s modulus of gravel is larger than Young’s modulus of the matrix, and Young’s modulus of different gravel and matrix has some differences. The gravel content is the main controlling factor affecting the macroscale Young’s modulus of glutenite; the gravel content and Young’s modulus of glutenite show a strong positive correlation, and the gravel size and particle size ratio have less influence on the macroscale Young’s modulus of glutenite. The difference in Young’s modulus between gravel and matrix causes the formation of local stress concentrations during loading and compression of glutenite. The smaller the gravel grain size, the higher the degree of non-uniformity of the grain size, the more likely it is to form higher local stresses. The results of the study provide a new prediction method for the prediction of the macroscale Young’s modulus of a glutenite reservoir.

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“…The discrete element method (DEM) is popular in investigating the macroscopic properties and microscopic mechanisms of granular materials. Previous numerical studies have revealed that particle size has a significant effect on the PFC simulation results [13][14][15][16][17][18] . However, most previous studies merely select the particle size based on the computer capacity and efficiency, neglecting its effect on the simulation results.…”

Section: Introductionmentioning

confidence: 99%

Influence mechanism of particle size on macro-meso deformation of particle accumulation under graded loading

zhiqi

Yang

Pei

et al. 2022

Preprint

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The sedimentation of particle accumulation caused by the overlying load exerts serious effects. In order to study the particle transport mechanism of sand granular material accumulation during sedimentation, the micro glass beads (MGB) are selected as the experimental research object. Glass bead particles with five size ranges are selected for graded loading test, and their mechanical properties and deformation mechanism under triaxial loading are analyzed by discrete element method (DEM). The experimental results show that with the increase of axial load, the deformation of glass beads gradually increases, the porosity gradually decreases, and the strain difference in the loading stage increases exponentially. Under the same load, the deformation of particle accumulation increases with the enlargement of bead size. The discrete element method results show that with the increase of axial load, the rotation angle and the maximum speed at all levels of beads gradually increase, the rotation angle difference at all loading stages increases, and the rotation angle and speed are also raised with the increase increasing particle size. Combined with the test and discrete element method analysis, it can be obtained that the increase of the accumulation strain difference of beads during loading is mainly due to the improved rotation of particles. With the increase of load, the rotation angle of beads increases and the displacement caused by rotation increases. With the increase of particle size, the porosity between beads increases, the coordination number decreases, the anti-rotation ability between beads decreases, and the rotation of particles is promoted, resulting in greater strain difference of accumulation.

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Investigating mechanics of conglomeratic rocks: influence of clast size distribution, scale and properties of clast and interparticle cement

Cited by 12 publications

References 41 publications

Effects of Contact Normal Bond Strength on Brazilian Tensile Strength by Particle Flow Code

Effects of Contact Normal Bond Strength on Brazilian Tensile Strength by Particle Flow Code

Simulation Study on the Prediction of Macroscale Young’s Modulus Based on the Mesoscale Characteristics of Tight Glutenite Reservoirs

Influence mechanism of particle size on macro-meso deformation of particle accumulation under graded loading

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