Calibration and uniqueness analysis of microparameters for DEM cohesive granular material

Ji, Songtao; Karlovšek, Jurij

doi:10.1016/j.ijmst.2021.11.003

Cited by 23 publications

(11 citation statements)

References 67 publications

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“…In recent years, with the development of DEM models and computational resources, DEMs have been used by scholars to study the crack/damage behavior of the coal pillar [18][19][20]. Zhu et al [21] used PFC to study the deformation characteristics, failure behavior, and stress distribution of the combined support column (CSP) of the residual coal pillar and filling body, and evaluated its stability.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Mechanical Characteristics and Width Optimization of Narrow Coal Pillar in Gob-Side Coal Seam Tunnel

Zhao

Zhang

et al. 2022

Sustainability

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To investigate the influence of coal pillar width on the stress variation of narrow coal pillar (NCP) in the gob-side tunnel in an inclined thick coal seam, theoretical analysis, numerical modeling, and field monitoring are performed to determine the optimal width of the narrow coal pillars in inclined coal seams. The mechanical characteristics of the NCP for varying widths were investigated. Furthermore, vertical and horizontal stress were calculated for various widths of the NCP. The results revealed that with the rise in the width, the vertical stress initially increased dramatically and then stabilized, whereas the mean horizontal stress increased gradually. The mathematical relation between stress and NCP widths was represented by two fitting equations. The evolution process of the plastic zone in the NCP under various widths and the damage form of various widths were obtained; that is, when the width was small, the position of the roadway near the shoulder corner of NCP was inclined to the top of NCP. The field monitoring data revealed that the optimum NCP width was 4 m. This NCP width could stabilize the roadway and improve the loss prevention of the NCP at the gob-side tunnel of similar mines.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Mechanical Characteristics and Width Optimization of Narrow Coal Pillar in Gob-Side Coal Seam Tunnel

Zhao

Zhang

et al. 2022

Sustainability

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“…The method is automatically implemented, thereby avoiding the laborious and time-consuming manual operation, and showing considerable potential for practical applications. Ji 72,73 proposed an optimized differential evolution calibration method that automatically calibrates the microscopic parameters to the target macroscopic parameters. Simulation experiments demonstrated that the macroscopic parameters, such as Young's modulus, Poisson's ratio, uniaxial compressive strength, and direct tensile strength, can be calibrated with a relative error of less than 5% .…”

Section: Evolutionary Algorithms Methodsmentioning

confidence: 99%

A Review of Calibration Strategies for Microscopic Parameters in Discrete Element Method

Liu

Wang

et al. 2023

Preprint

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Discrete element method (DEM) offers a distinct advantage in addressing fracture problems due to its exemption from partial differential equations. However, the governing equations of DEM incorporate microscopic parameters that cannot be accessed via experimental methods. Parameter calibration represents the most prevalent technique currently utilized to obtain the required microscopic parameters for DEM. This article initially introduces the development history of DEM calibration, then elaborates on the governing equations of DEM and the microscopic parameters required for calibration. Next, the principles of classical DEM calibration methods are explicated in detail, alongside the validation and discussion of their properties. Lastly, this study investigates the model dependence of DEM and presents guidance for the calibration application of large-scale simulations.

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“…Given the unique challenges posed by the limited water resources and delicate ecological environment in the arid and semi-arid regions of Yangjiacun Coal Mine, this study proposes the approach and foundational principles for implementing sustainable mining practices by examining the hydrogeological characteristics of the mining area and the various coal seam structures. [23][24][25] 1. The implementation of backfilling mining can mitigate the impact of coal extraction on the surrounding environment by compensating for the void created by mining and limiting the movement damage to the overlying strata.…”

Section: Stability Analysismentioning

confidence: 99%

“…It is also situated in a typified arid and semi‐arid fragile ecological environment in China, making the harmonious development of high‐strength coal production and ecological preservation a crucial area of research. Given the unique challenges posed by the limited water resources and delicate ecological environment in the arid and semi‐arid regions of Yangjiacun Coal Mine, this study proposes the approach and foundational principles for implementing sustainable mining practices by examining the hydrogeological characteristics of the mining area and the various coal seam structures 23–25 …”

Section: Stability Analysismentioning

confidence: 99%

Characteristics of overlying strata and mechanisms of arch beam failure in shallowly buried thick bedrock coal seams: A case study in western China

Wang,

Li,

Zhang

et al. 2023

Energy Science & Engineering

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The Yangjiacun coal mine, located in western China, exhibits distinctive characteristics, such as its shallow depth, thick bedrock, thin loose layer, and unique roof strata breaking movement. In this research, a comprehensive analysis of previous exploration data, subsequent mechanical testing, key stratum theory, natural equilibrium arch theory, and simulation tests and numerical simulations has been conducted to investigate the failure behavior of the overlying rock strata in the Yangjiacun Coal Mine. Specifically, the load‐bearing capacity of the key stratum structure in the bedrock and the morphological properties of the arch‐beam structure have been thoroughly examined. A mechanical model of the roof rock arch‐beam structure has been established, and an analytical formula for the limit size and stability criterion of the arch‐beam structure has been derived. The mining‐induced rock arch‐beam structure plays a crucial role in transferring the load of the upper strata to the surrounding goaf, thereby preventing subsidence and deformation of the overlying strata. However, the arch‐beam structure periodically experiences instability during the advancement of the working face, gradually progressing towards the upper layer until the main key stratum is breached and the arch‐beam structure collapses. Based on the characteristics of weathered rock and the arch‐beam failure model in the Yangjiacun Coal Mine, quantitative backfilling mining methods have been proposed to either compensate for the mining void created by coal extraction or limit the size of exposed key strata through strip mining, ensuring the stability of the R6 key stratum. This study represents a significant contribution to understanding the intricate failure behavior of overlying rock strata in coal mines and provides a valuable framework for the responsible and efficient extraction of coal resources in similar environments.

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Calibration and uniqueness analysis of microparameters for DEM cohesive granular material

Cited by 23 publications

References 67 publications

Numerical Simulation Study on Mechanical Characteristics and Width Optimization of Narrow Coal Pillar in Gob-Side Coal Seam Tunnel

Numerical Simulation Study on Mechanical Characteristics and Width Optimization of Narrow Coal Pillar in Gob-Side Coal Seam Tunnel

A Review of Calibration Strategies for Microscopic Parameters in Discrete Element Method

Characteristics of overlying strata and mechanisms of arch beam failure in shallowly buried thick bedrock coal seams: A case study in western China

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