Abstract
This paper presents a computational analysis of the evolution of mechanical characteristics in natural rock formations under the combined action of high-voltage electro-pulse and fluid injection. To solve the combined problem, a numerical solution based on a hydromechanical model is proposed. A system of anisotropic damage model is applied to capture tensile and shear damage. Innovative numerical simulations reveal that high-voltage electro-pulse can significantly enhance the effectiveness of rock-breaking in fluid injection. The simulation consists of two primary phases. First, high-voltage electro-pulse causes pre-damage and radial fissures in the rock formation, which creates a more favorable environment for subsequent fluid injection. The fluid flux is then conducted in the pre-damaged hole to fracture the rock formation further. The unique numerical method may have consequences for optimizing the rock-breaking strategy in geoengineering applications, such as the development of geothermal systems and the exploitation of oil/gas resources.
Highlights
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Presenting a novel method for rock-fracturing, high-voltage electropulse-assisted fluid injection.
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The hydro-mechanical coupled model is employed in the stage of electropulse and fluid injection.
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A system of tensile–shear mixed damage model is demonstrated and utilized to capture the tensile and shear damage.
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The in situ stress field and heterogeneity are considered to model natural rock formation.
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Data Availability
The datasets generated and/or analyzed during the current research are available from the corresponding author upon reasonable request.
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The research reported in this manuscript is funded by the National Natural Science Foundation of China (Grant No. 42077435).
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Conceptualization, PO; formal analysis and investigation, PO and PR; supervision and funding acquisition, RP; software, JC; writing—original draft, SN; writing—review and editing, QC.
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Ouyang, P., Rao, P., Wu, J. et al. Hydromechanical Modeling of High-Voltage Electropulse-Assisted Fluid Injection for Rock Fracturing. Rock Mech Rock Eng 56, 3861–3886 (2023). https://doi.org/10.1007/s00603-023-03257-8
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DOI: https://doi.org/10.1007/s00603-023-03257-8