Effect of gas content in macropores on hydraulic fracturing in rocks using a fully coupled DEM/CFD approach

Krzaczek, M.; Nitka, Michał; Tejchman, J.

doi:10.1002/nag.3160

Cited by 24 publications

(29 citation statements)

References 71 publications

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“…The finite difference methods (FDM) are even more sophisticated for the simulation of geomechanical processes [8]. Alghalandis used FDM to improve discrete fracture network engineering [9], Bouzeran et al simulated ground support performance in highly fractured and bulked rock masses [10], Bai et al conducted numerical investigations of gateroad system failure induced by hard roofs in a longwall top coal caving face [11].…”

Section: Methodsmentioning

confidence: 99%

Rock pressure relief is the basic alternative for sustainable underground mining

Nazimko¹,

Zakharova²,

Kusen³

et al. 2021

E3S Web Conf.

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Retreat longwall mining is the most productive system for underground extraction of tabulated deposits. However, the steady growth of the mining depth dramatically increased the ground pressure in chain pillars protecting the longwall entries. Therefore, several coal industries have tried to shift to pillarless mining and practiced maintenance of the head or tail entry behind the longwall in the stress relief zones using the backfill bodies in the thin coal seams. We modernized the pillarless variant of the retreat longwall system introducing the third roadway, which is driven in the consolidated goaf behind the moving longwall in a stress relief zone. We used a computer code FLAC3D to simulate stress redistribution during pillarless extraction of adjacent panels that assisted to determine optimal parameters of mining layout. This modernized technology provides for sustainable mining due to enhancement of transport, ventilation, safety conditions, and a comfortable environment because of the stability of the underground roadways, which serve the high productive longwalls.

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Section: Methodsmentioning

confidence: 99%

Rock pressure relief is the basic alternative for sustainable underground mining

Nazimko¹,

Zakharova²,

Kusen³

et al. 2021

E3S Web Conf.

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“…The numerical algorithm was divided into 3 main stages ( [21,22] This algorithm was repeated for each VP in VPN using an explicit formulation (Fig. 3).…”

Section: Virtual Pore Network Model Of Coupled Dem-cfdmentioning

confidence: 99%

“…The pure CFD was calibrated with the aid of permeability laboratory tests on rock specimens [22]. The following material constants were needed for the CFD simulations: reference pressure P 0 , fluid density 0 for the reference pressure P 0 , fluid bulk modulus K = 1 C , dynamic viscosity of the liquid μ.…”

Section: Virtual Pore Network Model Of Coupled Dem-cfdmentioning

confidence: 99%

“…The main research goal is to propose a validation procedure for simplified 2D fluid flow models coupled with DEM. The validation procedure is presented with our coupled 2D DEM-CFD approach that was formulated and used for describing a hydraulic fracturing process in rocks [21,22]. It simplifies the flow of fluid in a continuous domain under isothermal and high-pressure conditions to laminar flow through a virtual pore network composed of channels between granulates (VPN).…”

Section: Introductionmentioning

confidence: 99%

“…The approach improvements focused on the detailed tracking of liquid and gas fractions in pores and fractures depending on their different geometry, size, and position under isothermal conditions [21]. In addition, our approach was extended to multiphase fluid flow [22]. The coupled DEM-CFD approach was developed by the authors and implemented into the opensource DEM program YADE [23,24].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative study of high-pressure fluid flow in densely packed granules using a 3D CFD model in a continuous medium and a simplified 2D DEM-CFD approach

2021

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An isothermal compressible single-phase fluid flow through a non-homogeneous granular body composed of densely packed overlapping spheres imitating rock under high pressure was numerically studied using two different approaches. The first approach called the full 3D CFD model used the finite volume method (FVM) to solve the Reynolds-averaged Navier–Stokes equations using Reynolds stress model (BSL) in the continuous domain between the granulates. The model was verified, based on experimental and numerical results from the literature. The second approach was a simplified coupled DEM-CFD model based on a fluid flow network. The main aim of the work was to develop a validation procedure for simplified coupled DEM-CFD models due to the lack of experimental data for fluid flow characteristics in densely packed granules under extremely high-pressure conditions. First, a series of numerical simulations were performed for the fluid domain with the full 3D CFD model. The results of those simulations were next used to validate the 2D numerical results of the simplified coupled DEM-CFD model with respect to velocities, pressures, densities and flow rates. Almost the same pressure and density distributions and mass flow rates were obtained in both approaches. However, the fluid velocity was different due to the different fluid volumes in both fluid domains. The current simulation results constitute a reliable benchmark for validating other coupled 2D/3D DEM-CFD models that use a fluid flow network approach. Graphic abstract

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Studying the soil column formation in soft soil improved by vacuum preloading via coupled scale‐up CFD‐DEM simulations

Zhu

Cao

et al. 2022

Num Anal Meth Geomechanics

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In many large-scale land reclamation projects, vacuum preloading combined with a prefabricated vertical drain (PVD) system has been utilized successfully to improve the slurry with extremely high water content. However, in the use of PVD systems for soft soil with high fine contents, a dense "soil column" forms around the drainage board, which dramatically impedes the drainage and compromises the improvement level. To understand the soil column formation mechanism, coupled computational fluid dynamics-discrete element method (CFD-DEM) and scale-up strategy were employed in this work to study microsized soil particle movements. The results showed that the soil particles driven by the fluid gradually clogged the PVD board filter and then piled up. Under vacuum preloading, seepage occurred in the soil column, causing vacuum pressure loss and reducing the drainage velocity. As the permeability of the micron-sized soil column is exponentially related to the particle size, the drainage velocity through the soil column with high fine content was low. With the development of the soil column, the drainage velocity decreased, slowing the subsequent soil column development, and changing the packing structure of the soil column. In addition, the vacuum pressure, opening size of the drainage board filter, and cohesion among soil particles influenced the soil column formation. The effects of these aspects are discussed in this work to provide ideas for improving the drainage efficiencies of PVD systems.

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Effect of gas content in macropores on hydraulic fracturing in rocks using a fully coupled DEM/CFD approach

Cited by 24 publications

References 71 publications

Rock pressure relief is the basic alternative for sustainable underground mining

Rock pressure relief is the basic alternative for sustainable underground mining

Comparative study of high-pressure fluid flow in densely packed granules using a 3D CFD model in a continuous medium and a simplified 2D DEM-CFD approach

Studying the soil column formation in soft soil improved by vacuum preloading via coupled scale‐up CFD‐DEM simulations

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