Three-dimensional hydro-mechanical model of borehole in fractured rock mass using discrete element method

Karatela, Ehtesham; Taheri, Abbas

doi:10.1016/j.jngse.2018.02.032

Cited by 29 publications

(3 citation statements)

References 25 publications

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“…However, the mechanism of hydraulic fracturing cutting and pressure relief, especially the mechanism of hydraulic fracture propagation, is not yet clear. In the research of the hydraulic fracturing propagation law, many scholars have completed extensive research through experiments and simulations, among which XFEM is a method that can effectively simulate fracture propagation in an intact rock mass [44][45][46]. Therefore, with the help of ABAQUS finite element software, the fracture propagation mechanism of hydraulic fracturing in different stress fields under hard overburden conditions is simulated, providing parameter guidance for engineering tests.…”

Section: Simulation Schemementioning

confidence: 99%

Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention

et al. 2022

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As a widely-used method of digging roadways in China, gob-side entry driving features specific advantages, such as a high recovery rate and good isolation effects. However, under the condition of hard overburden, the excessive bearing pressure of small coal pillars will easily cause serious internal damage in the coal and the run-through of the plastic zone, leading to harmful gas leakage in the goaf. Therefore, based on the engineering background of small coal pillars in the 18506 working face of Xiqu Coal Mine, this paper comprehensively adopts theoretical analysis, numerical simulation, industrial tests, and other methods, analyzes the evolution mechanism of isolated bearing and plastic fracture areas of small coal pillar under hard overburden, studies the influence law of hard overburden cutting parameters on the isolation and stability of small coal pillars, and puts forward the technology of actively cutting the top to weaken the stress concentration of coal pillars under hard overburden. With the reasonable cutting parameters determined, the controllable mechanism of hydraulic fracturing cutting under hard overburden further revealed, and the hydraulic fracturing cutting technology with “controllable cutting orientation of hydraulic fracturing with local stress field intervention” formed as the basic core, the stress situation on the roof is improved, realizing the stability control of the coal pillars for the roadway protection, and avoiding gas leakage and other disasters caused by small coal pillar destruction.

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Section: Simulation Schemementioning

confidence: 99%

Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention

et al. 2022

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“…Research on the influencing factors of borehole stability and borehole failure modes in the bedded coal seam has been conducted by scholars at home and abroad. The influencing factors of borehole stability mainly include rock strength, gas pressure, stress and strain, burial depth, lateral pressure coefficient, and anisotropic permeability [11][12][13][14]. Yang et al [15] indicated that rock mechanics is the main theoretical basis for ensuring good stability, sand production, or casing damage.…”

Section: Introductionmentioning

confidence: 99%

“…Yang et al [15] indicated that rock mechanics is the main theoretical basis for ensuring good stability, sand production, or casing damage. Karatela et al [12] investigated the stability of boreholes in fractured rock using the discrete element method. The results show that the stability of boreholes depends largely on the strength of the rock.…”

Section: Introductionmentioning

confidence: 99%

Study on Instability Characteristics of the Directional Borehole on the Coal-Seam Roof: A Case Study of the Tingnan Coal Mine

et al. 2023

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Directional long drilling on the roof is an effective gas control measure in the goaf, but there is little research on the stability of the surrounding rock. In this study, the geological conditions of the #4 coal seam in the Tingnan Coal Mine, Shaanxi Province, China taken as the application background, and the deformation characteristics of boreholes under four typical coal and rock conditions were first analyzed based on the Universal Distinct Element Code (UDEC) numerical simulation. Secondly, the stress, strain, and plastic deformation of the rock surrounding the borehole with different diameters were carried out using the Fast Lagrangian Analysis of Continua 3D (FLAC 3D). The effect of the casing on the stability of the borehole was also simulated. The results showed that the borehole stability of coal and mudstone was lower than that of fine-grained sandstone and coarse-grained sandstone. The larger the borehole diameter, the lower the stability. The borehole tended to be unstable, especially when the diameter was 160 mm and 200 mm. Traditional pipes can provide some protection, but for large boreholes, the protection is poor. Based on the above research, uniaxial compression tests were carried out on various internal support tubes, such as ‘line-shaped’, ‘Y-shaped’, and ‘cross-shaped’. The results showed that the cross-shaped pipe had the highest compressive strength, which was 4–5 times that of the other types of protective pipe and had a good protective effect. The research results can provide reliable technical support for the protection of directional boreholes on roofs through strata and have important implications for the popularization and application of the directional long borehole technique.

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Dynamic Mechanical Response and Movement Evolution Characteristics of Fault Systems in the Coal Mining Process

Zhao

Chen

Xing

et al. 2021

Pure Appl. Geophys.

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Three-dimensional hydro-mechanical model of borehole in fractured rock mass using discrete element method

Cited by 29 publications

References 25 publications

Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention

Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention

Study on Instability Characteristics of the Directional Borehole on the Coal-Seam Roof: A Case Study of the Tingnan Coal Mine

Dynamic Mechanical Response and Movement Evolution Characteristics of Fault Systems in the Coal Mining Process

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