| Citation: | RAO Pingping，NING Ken，CUI Jifei. Disturbance law between rock fractures in the coupling process of high-voltage electric pulse and hydraulic fracturing[J]. Bulletin of Geological Science and Technology，2025，44（1）：90-100 doi: 10.19509/j.cnki.dzkq.tb20230364
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This study aims to investigate the interaction between rock fractures during the high-voltage electric pulse and hydraulic fracturing coupling process.
Based on elasticity, fracture mechanics, and damage mechanics, the high-voltage electric pulse discharge process under a water pressure of 3 MPa was numerically simulated using the extended finite element method to analyze rock mass fractures.
The results showed that under a discharge voltage of 5 kV, the maximum crack width in high-voltage electric pulse-hydraulic fracturing is 35% greater than that of traditional hydraulic fracturing. With the increasing discharge voltage, both the maximum crack width and crack initiation pressure increased, and the interference between fractures was enhanced. Additionally, the interference between crack in rock mass is also correlated to the principal stress difference, injection rate, and fracture number. Specifically, under the same voltage, higher injection rates result in longer crack lengths, a more prominent stress shadow effect, and stronger fracture interference. At the same injection rate, the greater the difference in principal stress, the more pronounced the directionality of crack extension towards the maximum principal stress. Both the initiation pressure and maximum crack width decrease with the increase of principal stress difference. Multiple crack branches can simultaneously expand and intersect, with the stress shadow area of three fractures being broader than that of two.
These findings provide theoretical support and a research framework for the study of underwater high-voltage electric pulse fracturing and coal seam permeability technology, laying a foundation for artificial crack control in practical applications.
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