Calibration of the microparameters of the discrete element method using a relevance vector machine and its application to rockfill materials

Ma, Chunhui; Zenz, Gerald; Staudacher, Edwin Josef; Cheng, Lin

doi:10.1016/j.advengsoft.2020.102833

Cited by 28 publications

(6 citation statements)

References 41 publications

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“…A blind adjustment of the microscopic parameters during the calibration process will increase the difficulty of the test to a large extent. This paper quickly determines the range of parameter values on the basis of mastering the intrinsic connection between the microscopic parameters and macroscopic indices (e.g., the effective modulus E has the highest degree of influence on the elastic modulus, k n and k s have a significant influence on the Poisson's ratio ν, and the coefficient of friction µ mainly affects the peak strength [37]). Finally, minor parameter fine-tuning was carried out according to the indoor test results until the simulation results were in good agreement with the indoor results, and the following microscopic parameters were finally determined, as shown in Table 1.…”

Section: Microscopic Parameter Calibrationmentioning

confidence: 99%

Research on the Characteristic State of Rockfill Materials and the Evolution Mechanism at the Microscopic Scale

Cui,

Zhang,

Shi

et al. 2024

Applied Sciences

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In this study, the real particle morphology of rockfill materials is obtained through three-dimensional scanning technology, and flexible boundary conditions are established by coupling the discrete element method and the finite element method. Then, a large-scale three-axis numerical simulation test is carried out on the rockfill materials to study the macroscopic mechanical properties and the change rule of the microscopic view of the rockfill materials in different characteristic states. The macroscopic results show that the stress–strain curves of the rockfill materials can be divided into softening and hardening curves. The phase transition, peak, and critical states of the softening-type curves show different mechanical properties, but no clear distinction between the characteristic state changes can be seen in the hardening-type curves. The microscopic results show that the displacement of the upper and lower parts of the flexible boundary of the softening curve increases with loading, and there is no obvious displacement in the middle part, but the middle particles undergo rotational deformation. An “X” shear band appears, and the strength of the force chain and the coordination number tend to increase first and then decrease. The flexible boundary displacements of the hardening-type curves are similar to those of the softening-type curves, but the central particles show a large number of cleavages instead of shear zones, and the force chain strength and coordination number levels show a continuous upward trend.

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Section: Microscopic Parameter Calibrationmentioning

confidence: 99%

Research on the Characteristic State of Rockfill Materials and the Evolution Mechanism at the Microscopic Scale

Cui,

Zhang,

Shi

et al. 2024

Applied Sciences

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“…In recent years, many underground oil and gas storage caverns have been constructed in geological formations composed of compact rock around the world [25][26][27]. In petroleum engineering, the compact rock around the underground oil and gas storage caverns is usually in the saturated status via carrying out artificial water injection to further rise the leakproofness of caverns, aiming for preventing the leakage of oil and gas [28][29][30][31]. For the water-sealed underground oil and gas storage caverns, when experiencing engineering activities such as excavation of caverns, etc., the coupling effect between seepage and stress fields of the saturated surrounding compact is inevitable to occur, which has a significant influence on the stability of underground storage caverns [32][33][34][35].…”

Section: Of 20mentioning

confidence: 99%

Analysis of the Hydromechanical Properties of Compact Sandstone and Engineering Application

Tang

Zhang

Wang

et al. 2023

Water

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The paper proposes a method to simulate the mechanical behavior of compact rock considering hydromechanics by combining physical experiments and numerical analysis. The effectiveness of the constructed method is validated by the comparison between the numerical and physical results of triaxial shear experiments on sandstone in seepage conditions. Based on the validated method, the stability of underground water-sealed oil and gas storage caverns in surrounding compact sandstone during excavation is analyzed. The main findings are as follows: The intrinsic permeability of compact sandstone has a power function relationship with the porosity; the combination of the porous media elastic model and the modified Drucker–Prager plasticity model can preciously represent the mechanical properties of compact sandstone; the proposed method can accurately replicate the hydromechanical response of compact sandstone in seepage conditions; the effects of hydromechanical effects have significant impacts on the stability of surround compact sandstone during the excavation of underground water sealed oil and gas storage caverns, which causes the obvious increase in stress, deformation and plastic deformation zones of the surrounding compact sandstone and remarkable decrease in the stability safety factor.

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“…The specimen size is Φ300 × 600 mm, and the shear rate is 0.4 mm/min with 200 kPa, 500 kPa, 800 kPa, 1200 kPa confining pressures. The deformation characteristic curve calibrates the rockfill's microscopic parameters using the calibration method proposed in [44]. Accordingly, the normal stiffness k n = 3.5MN/m, shear stiffness k s = 2.6MN/m, friction coefficient µ = 0.09, normal bond force b n = 2.2kN, and shear bond force b s = 1.6kN of rockfill particles are determined.…”

Section: Calibration Of Microscopic Parameters Of the Rockfillmentioning

confidence: 99%

Calibration of Adjustment Coefficient of the Viscous Boundary in Particle Discrete Element Method Based on Water Cycle Algorithm

Gao²,

Cheng

et al. 2022

Water

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The viscous boundary has a direct influence on the accuracy of structural dynamic response analysis, and the absorbing effect of the viscous boundary is controlled by the adjustment coefficient. Therefore, a calibration model of the viscous boundary’s adjustment coefficient based on the water cycle algorithm is established for the particle discrete element to improve the accuracy of dynamic response analysis. First, the traditional viscous boundary theory is utilized to realize the viscous boundary’s application method in the particle discrete element via programming. This avoids the reflection and superposition of seismic waves at the boundary and makes the structural dynamic response with the particle discrete element more real and accurate. Second, for the complex and time-consuming adjustment coefficients determination, a calibration model based on the water cycle algorithm and Latin hypercube sampling is established for the adjustment coefficients in the particle discrete element method. Finally, this calibration model is employed for the seismic response analysis of a rockfill slope, the maximum velocity of rock in this rockfill slope being about 1.30 times that of a seismic wave. Comparing the rockfill slope response with fixed and viscous boundaries, the calibration’s accuracy and the viscous boundary’s feasibility are demonstrated, further expanding the research and application of the particle discrete element method in dynamic response analysis.

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Calibration of the microparameters of the discrete element method using a relevance vector machine and its application to rockfill materials

Cited by 28 publications

References 41 publications

Research on the Characteristic State of Rockfill Materials and the Evolution Mechanism at the Microscopic Scale

Research on the Characteristic State of Rockfill Materials and the Evolution Mechanism at the Microscopic Scale

Analysis of the Hydromechanical Properties of Compact Sandstone and Engineering Application

Calibration of Adjustment Coefficient of the Viscous Boundary in Particle Discrete Element Method Based on Water Cycle Algorithm

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