Electrical impedance spectroscopy measurements to estimate the uniaxial compressive strength of a fault breccia

Abstract

Fault breccias are usually not suitable for preparing smooth specimens or else the preparation of such specimens is tedious, time consuming and expensive. To develop a predictive model for the uniaxial compressive strength (UCS) of a fault breccia from electrical resistivity values obtained from the electrical impedance spectroscopy measurements, twenty-four samples of a fault breccia were tested in the laboratory. The UCS values were correlated with corresponding resistivity values and a strong correlation between them could not be found. However, a strong correlation was found for the samples having volumetric block proportion (VBP) of 25-75%. In addition, it was seen that VBP strongly correlated with resistivity. It was concluded that the UCS of the tested breccia can be estimated from resistivity for the samples having VBP of 25-75%.

Comparison of Sandstone Damage Measurements Based on Non-Destructive Testing

“…As shown in Figure 6 a, The EIS can be visualized by displaying the modulus and phase angle of the impedance as a Nyquist plot on the complex plane [ 22 ]. In the Nyquist diagram, frequency increases from right to left and the EIS is composed of arcs, corresponding to high-frequency impedance, and straight lines, corresponding to low-frequency impedance.…”

Macro‐meso fatigue damage and instability of a fault bimrock exposed to multistage cyclic triaxial loads with different confining pressure

“…Afterwards, they used a cerchar abrasivity index for assessing the triaxial strength of Misis fault bimrock. 22 Slatalla and Kahraman 23 analyzed the acoustic emission responses of a fault bimrock, and revealed the influence of block content on the fracture signatures. Kato and Hirono 24 revealed the correlation between the mesoscopic structure and frictional strength of two kinds of fault gouge and a fault breccia, they found that the frictional strength of breccia is larger than the gouge.…”

“…Limited studies have been performed on fault breccia (a strong weld bimrock) under static uniaxial compression to obtain its compressive strength. 21,22 However, the weathering actions in the open-pit slope or underground mine results in the further fragmentation of fault bimrock, and fault rock is typically unweld or weak weld bimrocks that are composed of rock blocks and soil particles. Therefore, investigation on the mechanical response of fault rocks considering its mesoscopic structure is needed.…”

“…Kahraman and Alber 21 estimated the uniaxial compressive strength of a fault bimrock by electrical impedance spectroscopy measurement; they found that the volumetric block proportion strongly correlated to the resistivity. Afterwards, they used a cerchar abrasivity index for assessing the triaxial strength of Misis fault bimrock 22 . Slatalla and Kahraman 23 analyzed the acoustic emission responses of a fault bimrock, and revealed the influence of block content on the fracture signatures.…”

“…The previous studies are focused on fault gouge with artificial fine‐grained material. Limited studies have been performed on fault breccia (a strong weld bimrock) under static uniaxial compression to obtain its compressive strength 21,22 . However, the weathering actions in the open‐pit slope or underground mine results in the further fragmentation of fault bimrock, and fault rock is typically unweld or weak weld bimrocks that are composed of rock blocks and soil particles.…”