A New Ultrasound Method for Measuring the Physical and Mechanical Properties of Rocks

Abassi, Dris El; Faiz, Bouazza; Ibhi, Abderrahmane; Aboudaoud, Idris

doi:10.2113/jeeg21.1.29

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…The ultrasonic attenuation coefficient ( α ) reflects the degree of ultrasonic energy loss, which can reflect the degree of deformation failure and crack evolution in coal and rock bodies [ 57 ]. Therefore, the attenuation coefficients of the coal and rock bodies around borehole during progressive failure were analyzed to better understand the transmission process of ultrasonic waves inside the coal and rock bodies.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonic characteristics and equivalent crack width of coal and rock bodies around boreholes during progressive failure

Zhang

et al. 2023

PLoS ONE

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The ultrasonic characteristics of the coal and rock bodies around boreholes during failure are closely related to the crack propagation law. To investigate the ultrasonic characteristics and crack propagation law of coal and rock bodies around boreholes, different grouting samples with boreholes were taken to carry out ultrasonic test during progressive failure. The ultrasonic amplitude, velocity and attenuation coefficient of the samples were analyzed. According to the ultrasonic time difference formula, the equivalent crack width of the sample during the failure process is calculated. The influence of grouting material on the crack propagation law is quantitatively analyzed. The results show that: (1) The peak stress, elastic energy at the peak, ultrasonic parameters and crack propagation of the coal and rock bodies around boreholes show obvious differences influenced by the strength of the grouting material. (2) During the loading process, the arrival time of the first wave of the sample with holes is 5μs later than that of the grouting sample, and the ultrasonic energy attenuates fastest in the time domain, and the coda wave is not developed. (3) During the progressive failure, the ultrasonic velocity and attenuation coefficient of all show three stages of stability(0~0.6σp), slow change(0.6σp~0.8σp) and rapid change(0.8σp~1.0σp). According to the "sudden decrease" of velocity and the "sudden increase" of attenuation coefficient to judge the crack propagation of sample. (4) The equivalent crack width of the sample increases exponentially with the increase of stress level. At the time of reaching the peak stress, the equivalent crack width of SH-BH increases about 0.027mm~0.032mm, SH-PU about 0.01mm~0.014mm, and SH-CEM about 0.002mm~0.006mm.

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Section: Resultsmentioning

confidence: 99%

Ultrasonic characteristics and equivalent crack width of coal and rock bodies around boreholes during progressive failure

Zhang

et al. 2023

PLoS ONE

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“…To estimate reserves of iron ore and design technological processes for its enrichment, in order to obtain a high-quality concentrate, knowledge about the mineralogical characteristics of the extracted raw materials is necessary [4,5]. Although ultrasonic testing is non-destructive and relatively easy to implement, its potential has not yet been fully realised in rock characterisation, as the methodology and technical base strongly influence the obtained results [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Mineralogical Analysis of Iron Ore Using Ultrasonic Wave Propagation Parameters

Morkun

Fischerauer

Tron

et al. 2023

Acta Mechanica Et Automatica

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Availability, relative simplicity and low cost, combined with ever-increasing capabilities, have led to a significant increase in the use of ultrasonic measurements of mining process variables in recent times. The scope of application varies from the study of the characteristics of raw materials and products of its processing to the operational assessment of the current parameters characterising the state of the process equipment. The purpose of this study is to develop methods for obtaining information about the characteristics of mineral raw materials as a result of ultrasonic logging of wells in a rock mass. The proposed approach makes it possible to improve the quality of information support for the management of technological processes of mining and processing of ore and thereby improve the quality of products supplied to the metallurgical stage and reduce overall production costs.

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Classification of Iron Meteorites with High Frequency Ultrasonic Waves

Abassi

Faiz

Ibhi

et al. 2019

JEEG

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We present the results of an ultrasonic pulse-echo technique and its potential to classify iron meteorites into hexahedrites, octahedrites and ataxites by determining their acoustic impedance and phase velocity. Our technique has been adapted from those used in the field of ultrasonic non-destructive investigation of a variety of materials. The main advantage of our technique is that it does not need any preparation of the meteorites like cutting and etching and therefore is rapid, easy and non-destructive. In essence, a broadband acoustic transducer is used in a monostatic pulse-echo configuration which means that both the transducer and the meteorite sample are located in a water bath and adjusted in the way that the ultrasonic pulse shit the meteorite sample at normal incidence. Then the reflected pulses from the front and rear faces of the meteorite sample are measured with the emitting transducer, digitally recorded and processed to analyze the signal. After Fourier transforming the echoed pulses from the front and the rear face of the meteorite sample, the calculated reflection coefficients yield the phase velocity and the acoustic impedance. Our study investigates a variety of iron meteorites collected in Morocco and other countries and it helps to understand how the nickel content of these meteorites affects the acoustic impedance. It reveals that the acoustic impedance of iron meteorites increases with increasing nickel content, so that a further refinement of our technique might have the potential to classify iron meteorites directly and reliably into hexahedrites, octahedrites and ataxites without destroying them.

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A New Ultrasound Method for Measuring the Physical and Mechanical Properties of Rocks

Cited by 3 publications

References 19 publications

Ultrasonic characteristics and equivalent crack width of coal and rock bodies around boreholes during progressive failure

Ultrasonic characteristics and equivalent crack width of coal and rock bodies around boreholes during progressive failure

Mineralogical Analysis of Iron Ore Using Ultrasonic Wave Propagation Parameters

Classification of Iron Meteorites with High Frequency Ultrasonic Waves

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