Sensitivity Analysis of the Micro-Parameters Used in a PFC Analysis Towards the Mechanical Properties of Rocks

Castro-Filgueira, U.; Alejano, Leandro R.; Arzúa, J.; Ivars, Diego Mas

doi:10.1016/j.proeng.2017.05.208

Cited by 103 publications

(51 citation statements)

References 7 publications

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“…Eq. (3) theoretically proving the study results of Xu et al [18], Castro-Filgueira et al [19], and Chen [20], in which the contact normal bond strength has a significant influence on the Brazilian tensile strength. Based on Eq.…”

Section: Theoretical Relationship Between Contact Normal Bond Strengtsupporting

confidence: 55%

“…However, the quantitative relationship between the contact normal bond strength and Brazilian tensile strength and direct tensile strength was not established. Castro-Filgueira et al [19] found that the contact normal bond strength has a high influence on Brazilian tensile strength, while the stiffness ratio has a high influence on Poisson's ratio. Their study used a constant value of ball radius ratio, which influenced the universality of the calculation results.…”

Section: State Of the Artmentioning

confidence: 99%

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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: Theoretical Relationship Between Contact Normal Bond Strengtsupporting

confidence: 55%

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

View full text Add to dashboard Cite

show abstract

“…Then, the numerical simulation results were compared with the results of experimental tests or field tests. The microscopic mechanical parameters were adjusted repeatedly by the "trial and error" method [39] until they met the required simulation conditions. The "trial and error" method used to check the PFC simulation process (version 5.0) is shown in Figure 3.…”

Section: Parameter Checking and The Verification Of Mhsmentioning

confidence: 99%

“…The "trial and error" method used to check the process of the particle flow code (PFC) model (Modified from Castro-Filgueira et al (2017)[39].…”

mentioning

confidence: 99%

The Distinct Elemental Analysis of the Microstructural Evolution of a Methane Hydrate Specimen under Cyclic Loading Conditions

2019

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Submarine slope instability may be triggered by earthquakes and tsunamis. Methane hydrate sediments (MHS) are commonly buried under submarine slopes. Submarine slides would probably be triggered once the MHS are damaged under cyclic loading conditions. For this reason, it is essential to research the mechanical response of MHSs under dynamic loading conditions. In this study, a series of drained cyclic biaxial compressive tests with constant stress amplitudes were numerically carried out with the distinct element method (DEM). The cyclic loading number decreased as the hydrate saturation (Sh) increased when the MHS were damaged. The failure mode of the MHS was shown to be dependent on the dynamic stress amplitude and hydrate saturation. The microstructure of MHS during the cyclic loading shear process was also analyzed. The results can help us to understand the mechanical behavior of MHS during the cyclic loading process and develop micromechanical-based constitutive models.

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“…erefore, the microscopic parameters selection and verification are needed before the numerical simulation [8]. Usually, the microparameters of PFC rock models are calibrated by simulating the uniaxial compression experiments [17,22]. During the process of calibration, the microparameters of the particles and bonds are adjusted many times through "trial and error" method until these parameters can better reflect the mechanical properties of the real rocks [22][23][24].…”

Section: Parameters Of Numerical Rock Modelsmentioning

confidence: 99%

Analysis of Mechanical and Acoustic Emission Characteristics of Rock Materials with Double‐Hole Defects Based on Particle Flow Code

Zhang

Wang

Tian

et al. 2018

Shock and Vibration

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ere are a lot of fissures, holes, and other defects in the formation of natural rocks. Under the influence of the external loads, these defects may cause engineering problems. erefore, it is of great significance to analyze the characteristics of damage evolution of the defective rocks. In the study, the double-hole defective rocks with different angles of the center connection line are considered and the numerical models are established firstly. en the mechanical behavior and acoustic emission (AE) characteristics are analyzed systematically. Finally the laws of damage evolution of the defective rock materials are investigated based on the AE characteristics. e research results show that the stress-strain behavior of the defective rocks can be divided into elastic stage, plastic stage and failure stages. e characteristics of acoustic emission evolution and laws of damage evolution are closely related to the stress-strain relationship. e elastic modulus of the double-hole defective rocks is similar with different angles of the center connection line, but the peak strength is different. e shape of the peak strength of these defective rocks is a W type owing to the different failure modes. e influences of different angles of the center connection line on the characteristics of AE evolution include the maximum events number, the strain value of the initial AE events and the maximum AE events, and the strain range of the serious AE events. Different angles of the center connection line have different influences on the laws of damage evolution of the double-hole defective rocks.

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Sensitivity Analysis of the Micro-Parameters Used in a PFC Analysis Towards the Mechanical Properties of Rocks

Cited by 103 publications

References 7 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

The Distinct Elemental Analysis of the Microstructural Evolution of a Methane Hydrate Specimen under Cyclic Loading Conditions

Analysis of Mechanical and Acoustic Emission Characteristics of Rock Materials with Double‐Hole Defects Based on Particle Flow Code

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