Micromechanics of hydraulic fracturing and damage in rock based on DEM modeling

Tomac, Ingrid; Gutierrez, Marte

doi:10.1007/s10035-020-01023-z

Cited by 25 publications

(7 citation statements)

References 45 publications

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“…The auxiliary installation device for rock bolt drilling In the 20th century, Cundall et al [12][13][14] proposed the discrete element method (DEM), and simulated the conveying performance of screw conveyor for the first time through DEM. Nowadays, DEM has become the main application method for simulating screw conveying, and it is also widely used in geotechnical field, [15][16][17] mining field, [18][19][20] chemical field, [21][22][23] and agricultural field. [24][25][26] With the continuous improvement and development of the DEM, it has been widely used in the field of bit research to construct different drilling environments through DEM, and then analyze the particle movement in the drilling process.…”

Section: F I G U R Ementioning

confidence: 99%

Drilling study of bit in gravel environment based on DEM–MBD

Gao

Liu

et al. 2021

Engineering Reports

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In the process of rock bolt support for the roadway with floor heave, the rock bolt cannot reach the bottom of the borehole smoothly due to the influence of the collapse gravels around the borehole. In order to solve the problem of difficult rock bolt installation, the auxiliary installation device of rock bolt drilling was innovatively designed. At the same time, a new method of auxiliary bolt installation was put forward, in which a bit was installed at the bottom of the bolt to assist the bolt drilling. The drilling process of the bit was simulated by the co-simulation of discrete element method (DEM) and multibody dynamics method (MBD). The axial resistance of the bit and the change law of the particles movement were studied under different motion parameters and structural parameters. It was found that the drilling performance of bit was directly related to the motion parameters and structure of bit. And the selection of gravel parameters in DEM was verified by experiments. The research results can provide technical guidance for bit structure design and the selection of motion parameters of bolt drilling auxiliary installation device, and can effectively improve the rock bolt installation efficiency.

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Section: F I G U R Ementioning

confidence: 99%

Drilling study of bit in gravel environment based on DEM–MBD

Gao

Liu

et al. 2021

Engineering Reports

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“…DEM divides the research object into multiple units, 19 links each unit together through contact, and displays the overall mechanical characteristics by analyzing the contact between each unit 20 . Therefore, DEM method has drawbacks in describing the action of fluid on solid 21,22 …”

Section: Introductionmentioning

confidence: 99%

“…20 Therefore, DEM method has drawbacks in describing the action of fluid on solid. 21,22 In addition to these mentioned, there are phase field model and cohesive element method, which have been proven effective tools for modeling fracture initiation, propagation, coalescence, and branching in solids. [23][24][25] The FDEM can not only reflect the advantages of high computational efficiency of the finite element method but also study the heterogeneous characteristics of rocks like the DEM.…”

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confidence: 99%

Research on the impact of pre‐existing geological fractures on hydraulic fracturing in high in situ stress environments

Chang,

Qiu,

et al. 2024

Energy Science & Engineering

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The formation of complex fracture network is a difficult problem in the process of deep rock reservoir reconstruction, and the key to the generation of intricate fracture systems in deep reservoirs is to communicate more pre‐existing fractures through hydraulic fracturing, so as to enhance oil recovery. At present, there are few studies on the interactions of hydraulic fractures with pre‐existing fractures under high stress. Therefore, this research studied the influence of the number of pre‐existing fractures on the characteristics of hydraulic fractures by using advanced hydraulic fracturing instruments, and then analyzed the characteristics of hydraulic fractures under different pre‐existing fracture number based on three‐dimensional topography scanning technology and three‐dimensional square box fractal dimension calculation method. Based on the three‐dimensional finite element discrete element method, further research is carried out. The laboratory test findings indicated that the increase of pre‐existing fractures will make the pump pressure curve more stable during the test, and will significantly improve the roughness of hydraulic fractures. The numerical simulation indicated that as the quantity of pre‐existing fractures grows, the fracture area and width also increase, and in instances of a substantial quantity of pre‐existing fractures, the hydraulic fractures are prone to bifurcation, which contributes to the development of intricate fracture networks. With the increase of natural fracture angle, the fracture width decreased, but the fracture area increased. In this study, the influence of the number of pre‐existing fractures on hydraulic fracturing was studied through laboratory tests and numerical simulations, which provided theoretical reference for engineering practice.

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“…Within this methodological framework, two primary approaches are prominent: the Particle Flow Method [15] and the Block Discrete Element Method [16,17]. The Particle Flow Method is particularly suited for delving into the micromechanics of rock masses [18], while the Block Discrete Element Method finds its applicability in the intermediate realm, bridging the gap between continuous medium and particle discrete body analyses [19,20]. To enhance the simulation of fracture behavior within rock masses, a novel approach, the Bonded Block Model (BBM), has been introduced and integrated into 3DEC.…”

Section: Introductionmentioning

confidence: 99%

Fractal Evolution Characteristics of Isolation Layers in a Submarine Gold Mine: A Case Study

Chen,

Li,

Lin

et al. 2024

Minerals

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The establishment of an isolation layer in submarine mining has been a persistent challenge. In the context of this research, we conducted a similarity simulation test to preliminarily assess the interaction between the thickness and extent of the isolation layer. Subsequently, we introduce an innovative approach that integrates fractal theory and the Bonded Block Model (BBM) to simulate undersea isolation layer mining. The validation of this method relies on on-site borehole scanning and displacement monitoring, which depict the intricate fractal evolution of fractures and predict the optimal thickness of the isolation layer. Our findings affirm the robustness and validity of this method. Evaluation of the fractal dimensions of fractures reveals that a critical threshold of 1.7 is essential to prevent structural failure of the isolation layer, while a limit of 1.5 is necessary to avoid significant water ingress. Remarkably, the correlation dimension of the settlement time series closely aligns with the fractal dimension of the fractures, underscoring the feasibility of ensuring the safety of isolation layer mining through real-time settlement monitoring.

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Micromechanics of hydraulic fracturing and damage in rock based on DEM modeling

Cited by 25 publications

References 45 publications

Drilling study of bit in gravel environment based on DEM–MBD

Drilling study of bit in gravel environment based on DEM–MBD

Research on the impact of pre‐existing geological fractures on hydraulic fracturing in high in situ stress environments

Fractal Evolution Characteristics of Isolation Layers in a Submarine Gold Mine: A Case Study

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