Hydromechanical Modeling of High-Voltage Electropulse-Assisted Fluid Injection for Rock Fracturing

Ouyang, Peihao; Rao, Pingping; Wu, Jian; Cui, Jifei; Nimbalkar, Sanjay; Chen, Qingsheng

doi:10.1007/s00603-023-03257-8

Cited by 5 publications

(1 citation statement)

References 53 publications

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“…It is shown that the fracture efficiency of the solid depends on the pressure pulse waveform, which in turn depends on the rate of deposition of electrical energy into the plasma channel. Ouyang [47] proposed a numerical solution of PPD-fractured rock based on a hydrodynamic model. Shi [48] used the user subroutine provided by ANSYS AUTODYN to build a coupling model containing the circuit, the burst wire, and the surrounding water to simulate the copper wire explosion in the liquid.…”

Section: Introductionmentioning

confidence: 99%

Research on the Crushing of Reinforced Concrete Two-Way Slabs by Pulse Power Discharge Technology

Lin,

Yang,

Liu

et al. 2024

Buildings

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The application of pulse power discharge (PPD) technology in the crushing and dismantling of concrete structures has characteristics related to both green and environmental protection, as well as safety and reliability, with broad application prospects in the construction and municipal engineering fields in dense urban areas. Nevertheless, the research into using this technology to break reinforced concrete (RC) slabs is very limited, while the influence of key parameters on the crushing effect of reinforced concrete slabs is not clear. To solve this problem, a finite element model of an RC slab was established by ABAQUS. The effect of a shock wave generated by PPD on the surrounding concrete was simulated by an explosion-load equivalent, and the development process of concrete crack was simulated by a cohesive force model. Based on the results of the model analysis, the effects of reinforcement spacing, as well as diameter and concrete strength on the crushing effect of RC slabs were investigated. The results show that the increase in reinforcement diameter and the decrease in reinforcement spacing have a significant effect on limiting the development of cracks. According to the development of cracks, they can be divided into three types: edge cracks, cracks between central holes, and cracks between edge holes. The influence of reinforcement spacing and diameter on the first two crack widths is the most obvious. The increase in concrete strength also reduces the width of cracks. Based on the analysis results, the calculation expressions of the crushing effect of the PPD technique on RC slabs were established, which provides theoretical support for the popularization and application of this technique.

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Section: Introductionmentioning

confidence: 99%

Research on the Crushing of Reinforced Concrete Two-Way Slabs by Pulse Power Discharge Technology

Lin,

Yang,

Liu

et al. 2024

Buildings

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Impact of Temperature on the Performance of Plasma-Pulse Geo-Drilling (PPGD)

Ezzat,

Börner,

Kammermann

et al. 2024

Rock Mech Rock Eng

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Advanced Geothermal Systems (AGS) may in principle be able to satisfy the global energy demand using standard continental-crust geothermal temperature gradients of 25–35 $$^\circ$$ ∘ C/km. However, conventional mechanical rotary drilling is still too expensive to cost-competitively provide the required borehole depths and lengths for AGS. This highlights the need for a new, cheaper drilling technology, such as Plasma-Pulse Geo-Drilling (PPGD), to improve the economic feasibility of AGS. PPGD is a rather new drilling method and is based on nanoseconds-long, high-voltage pulses to fracture the rock without mechanical abrasion. The absence of mechanical abrasion prolongs the bit lifetime, thereby increasing the penetration rate. Laboratory experiments under ambient-air conditions and comparative analyses (which assume drilling at a depth between 3.5 and 4.5 km) have shown that PPGD may reduce drilling costs by approximately 17–23%, compared to the costs of mechanical drilling, while further research and development are expected to reduce PPGD costs further. However, the performance of the PPGD process under deep wellbore conditions, i.e., at elevated temperatures as well as elevated lithostatic and hydrostatic pressures, has yet to be systematically tested. In this paper, we introduce a standard experiment parameter to examine the impact of deep wellbore conditions on PPGD performance, namely the productivity (the excavated rock volume per pulse) and the specific energy (the amount of energy required to drill a unit volume of rock). We employ these parameters to investigate the effect of temperature on PPGD performance, with temperatures increasing up to 80 $$^\circ$$ ∘ C, corresponding to a drilling depth of up to approximately 3 km.

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Experimental and numerical study on the facture behavior of heated-granite subjected to high-voltage electric pulse

Yin,

Liu,

Chen

et al. 2024

Engineering Fracture Mechanics

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Hydromechanical Modeling of High-Voltage Electropulse-Assisted Fluid Injection for Rock Fracturing

Cited by 5 publications

References 53 publications

Research on the Crushing of Reinforced Concrete Two-Way Slabs by Pulse Power Discharge Technology

Research on the Crushing of Reinforced Concrete Two-Way Slabs by Pulse Power Discharge Technology

Impact of Temperature on the Performance of Plasma-Pulse Geo-Drilling (PPGD)

Experimental and numerical study on the facture behavior of heated-granite subjected to high-voltage electric pulse

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