Simulation of Electrical and Thermal Properties of Granite under the Application of Electrical Pulses Using Equivalent Circuit Models

Fukushima, Kyosuke; Kabir, Mahmudul; Kanda, K.; Obara, Naoko; Fukuyama, Mayuko; Otsuki, Akira

doi:10.3390/ma15031039

Cited by 8 publications

(6 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen from Figure 8 that under the same normal stress condition, the peak shear strength decreases with the increase in λ value. This indicates that the greater the strength difference between the two sides of the rock joint, the worse the shear capacity of the rock joint [ 27 , 28 ]. With the same λ value, the peak shear strength increases with the increase in normal stress, and the normal stress can effectively improve the shear strength of the rock joint.…”

Section: Test Results and Analysismentioning

confidence: 99%

Study on Shear Behavior and Failure Characteristics of Bolted Anisotropic Rock Joints

Jiang

Liu

et al. 2023

Materials

View full text Add to dashboard Cite

Anisotropic discontinuity exists widely in rock masses of mines, tunnels, slopes, water conservancy and hydropower projects. The shear characteristics of bolted anisotropic rock joints are extremely important for the stability design of engineering rock mass. However, few scholars have studied the bolted anisotropic rock joint. The different rock properties on both sides of the rock joint, especially the different rock strengths, will greatly affect the deformation characteristics and failure mode of the rock mass. Based on this, a series of shear tests were carried out on the bolted anisotropic rock joint under different normal stresses, and the characteristics of shear stress–shear displacement curve, shear strength, failure characteristics of the rock joint and deformation characteristics of the bolt are discussed. λ is defined as the strength ratio of upper and lower rock on the structural surface. The results show that the effect of λ on the shear stress–shear displacement curve is not obvious at the pre-fracture stage. The shear stress–shear displacement curve at the pre-breaking stage of the bolt presents a softening stage when the normal stress is equal to 0.5 MPa, tends to be horizontal when the normal stress is equal to 1 MPa and presents a hardening stage when the normal stress is greater than 1 MPa. After the bolt is broken, the shear stress–shear displacement curve presents a stepped-down descent. With the increase in λ, the breaking shear stress of the bolt increases. Elliptic failure occurs on the surface of the bolted anisotropic rock joint, and the length of the major axis of the ellipse decreases with the increase in λ value and normal stress. The bolts with different λ values of anisotropic rock joint show “Z-shaped” tensile bending deformation characteristics after shear fracture, and the horizontal and vertical components of the bolt deformation decrease with the increase in λ value and normal stress. The fracture shear displacement of the bolt increases with the increase in normal stress and decreases with the increase in λ value. The research results are helpful to further understand the shear mechanical characteristics and differences of bolted rock joints and provide a reference for solving the engineering problems of the composite layered rock mass.

show abstract

Section: Test Results and Analysismentioning

confidence: 99%

Study on Shear Behavior and Failure Characteristics of Bolted Anisotropic Rock Joints

Jiang

Liu

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…Fukushima et al [ 6 , 7 ] reported their studies on the modeling and simulation of electrical disintegration. Fukushima et al [ 6 ] developed a simulation method using equivalent circuits of granite to better understand the crushing process with high-voltage (HV) electrical pulses that have been previously identified as a selective liberation method. Using their simulation works, they calculated the electric field distributions, produced heat and temperature changes in granite when an electrical pulse was applied.…”

Section: The Special Issuementioning

confidence: 99%

Editorial for the Special Issue: “Characterization and Processing of Complex Materials”

Otsuki

2023

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Zuo et al (2020) modeled insulation cable with equivalent circuit models by considering placing the cable into small fractions of insulation (dielectric) material and discussed the HV direct current influence on insulation cables [14]. Kabir et al (2011) [18] made equivalent circuit models to understand the fine ceramics (ZnO varistors) by considering hundreds of ZnO grains of an average grain size of 1-2 µm to understand the nonlinear I-V (current-voltage) properties of ZnO varistors. Ono et al (2009) [17] calculated the electric-field distribution in composite materials using equivalent circuit models under HV applications.…”

Section: Introductionmentioning

confidence: 99%

“…With the above literature, the importance of considering each mineral to understand mineral liberation under a HV application is clearly identified. Additionally, it is worth noting that the equivalent circuit model analysis has a strong potential to understand the electric pulse comminution [18].…”

Section: Introductionmentioning

confidence: 99%

“…We discussed the HV application on granite in the other paper [18], where an equivalent circuit was used to simulate the behavior of granite under a HV impulse application. As the results proved the effectiveness of our equivalent circuit model in electric-pulse liberation, in the current work, we aimed to further advance this model by considering voids' (pores in minerals as well as rocks) behavior under a HV impulse on the rocks by using the measurement data of electrical properties of the dielectric breakdown of air.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Equivalent Circuit Models: An Effective Tool to Simulate Electric/Dielectric Properties of Ores—An Example Using Granite

et al. 2022

Self Cite

View full text Add to dashboard Cite

The equivalent circuit model is widely used in high-voltage (HV) engineering to simulate the behavior of HV applications for insulation/dielectric materials. In this study, equivalent circuit models were prepared in order to represent the electric and dielectric properties of minerals and voids in a granite rock sample. The HV electric-pulse application shows a good possibility of achieving a high energy efficiency with the size reduction and selective liberation of minerals from rocks. The electric and dielectric properties were first measured, and the mineral compositions were also determined by using a micro-X-ray fluorescence spectrometer. Ten patterns of equivalent circuit models were then prepared after considering the mineral distribution in granite. Hard rocks, as well as minerals, are dielectric materials that can be represented as resistors and capacitors in parallel connections. The values of the electric circuit parameters were determined from the known electric and dielectric parameters of the minerals in granite. The average calculated data of the electric properties of granite agreed with the measured data. The conductivity values were 53.5 pS/m (measurement) and 36.2 pS/m (simulation) in this work. Although there were some differences between the measured and calculated data of dielectric loss (tanδ), their trend as a function of frequency agreed. Even though our study specifically dealt with granite, the developed equivalent circuit model can be applied to any other rock.

show abstract

Simulation of Electrical and Thermal Properties of Granite under the Application of Electrical Pulses Using Equivalent Circuit Models

Cited by 8 publications

References 19 publications

Study on Shear Behavior and Failure Characteristics of Bolted Anisotropic Rock Joints

Study on Shear Behavior and Failure Characteristics of Bolted Anisotropic Rock Joints

Editorial for the Special Issue: “Characterization and Processing of Complex Materials”

Equivalent Circuit Models: An Effective Tool to Simulate Electric/Dielectric Properties of Ores—An Example Using Granite

Contact Info

Product

Resources

About