Study on acoustic–electric–heat effect of coal and rock failure processes under uniaxial compression

Li, Zhonghui; Lou, Quan; Wang, Enyuan; Liu, Shuaijie; Niu, Yue

doi:10.1088/1742-2140/aa8437

Cited by 37 publications

(12 citation statements)

References 29 publications

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“…By contrast, the use of similar materials enables not only eliminating the influence of initial damage but also prefabricating fractures. In this way, the influence of different fracture morphology on the strength of rock mass can be analyzed [4][5][6]. Since similar materials have many advantages, they are widely employed to study the influence of single factor and multiple factors on many scientific problems [7].…”

Section: Introductionmentioning

confidence: 99%

Mixing Ratios and Cementing Mechanism of Similar Silty Mudstone Materials for Model Tests

Shi

et al. 2021

Advances in Civil Engineering

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The similarity model test is one of the important means to study the engineering properties of soft rock. This study aims to develop similar materials for silty mudstone, which has characteristics of low strength and water expansion, based on traditional materials including gypsum, barite powder, clay minerals, and distilled water. The orthogonal design method was used to determine the mixing ratios of the similar materials. The density, uniaxial compressive strength, tensile strength, elastic modulus, and Poisson’s ratio were selected as control indicators of the similar materials. The results show that the water content is the dominant factor for the density, tensile strength, elastic modulus, and Poisson’s ratio of the similar materials of silty mudstone, while the gypsum content is the dominant factor for the uniaxial compressive strength. The physical and mechanical properties of the similar material samples with water content of 19%, barite powder ratio of 32%, and gypsum mass of 250 g show good similarity to those of the raw silty mudstone. The water absorption and expansibility of similar materials with clay mineral ratio of 12% are consistent with those of the raw silty mudstone. The scanning electron microscopy (SEM) observation indicates that the similar material with optimal mixing ratios exhibits a similar microstructure to that of silty mudstone.

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Section: Introductionmentioning

confidence: 99%

Mixing Ratios and Cementing Mechanism of Similar Silty Mudstone Materials for Model Tests

Shi

et al. 2021

Advances in Civil Engineering

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“…Through this fracture network, the gas, heat and fresh air can be regularly transported to the high -temperature zone, creating thermal cycles that can further extend the existing fractures (Lu et al 2019). The process of crack formation and development can eventually pose a threat to the safety of mine exploration (Li et al 2018a).…”

Section: Introductionmentioning

confidence: 99%

Engineering properties of sandstone heated to a range of high temperatures

Pathiranagei

Gratchev

2021

Bull Eng Geol Environ

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This study is an investigation of the effect of high temperatures on the engineering properties of sandstone. The rock was first subjected to a range of temperatures such as 25 o C, 200 o C, 400 o C, 600 o C and 800 o C, and a series of porosity, unconfined compression, X-ray diffraction and scanning electron microscope tests were then performed on the heated specimens. In addition, sandstone specimens were also subjected to different numbers (i.e., 1, 2, 4, 6 and 10) of thermal cycles to better understand the effect of high temperature variations on rock behaviour.It was observed that high temperature in the range of 200 o C -400 o C had some influence on the rock properties; that is, the porosity slightly decreased while the strength of the rock increased.However, for T≥600 o C, there was a significant increase in rock porosity that correlated with a decrease in rock strength. The observed changes in engineering properties were attributed to the changes in rock mineralogy and microstructure that occurred at T>600 o C where the major minerals underwent the process of phase transformation and a significant increase in rock cracking. Regardless of the temperature, almost all specimens failed in tension during unconfined compression. The effect of thermal cycles was seen in a progressive increase in rock porosity and a corresponding decrease in the elastic modulus of the rock.

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“…AE is the release of energy from coal and rock mass in the wave form to be received by sensors. [22][23][24][25] Wang et al [26][27][28] applied the AE and electromagnetic radiation (EMR) system to coal and gas outburst monitoring and early warning and achieved good early warning results, which significantly improved the accuracy of outstanding warnings. [8][9][10][11] Moreover, this method only requires a small amount of work, does not occupy special working time, does not affect production, and has the technical advantages which the traditional forecast technologies do not have.…”

Section: Introductionmentioning

confidence: 99%

“…By comparing and analyzing the characterization parameters of AE, it was found that the AE ringing event could be used as one of the important parameters for coalrock dynamic disaster prediction. [22][23][24][25] Wang et al [26][27][28] applied the AE and electromagnetic radiation (EMR) system to coal and gas outburst monitoring and early warning and achieved good early warning results, which significantly improved the accuracy of outstanding warnings. Through relevant research, it is found that the current research on the AE precursor characteristics of gas-bearing rock mass failure is primarily conducted under laboratory conditions.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission monitoring technology for coal and gas outburst

et al. 2019

Energy Science & Engineering

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In recent years, with the increase in mining depth and strength, coal‐rock gas dynamic disasters, such as coal and gas outburst, have shown an increasing trend. Acoustic emission (AE) technology has been viewed as a promising method that can effectively forecast coal and gas dynamic disasters. This paper first tests the AE characteristics of coal and rock samples during loading. Then, self‐developed AE continuous monitoring and early warning equipment is used to monitor and predict the coal and gas outburst dynamic disasters on the working face. And it is found that the coal samples primarily show ductile failure, and the AE exhibits the evolutionary characteristics of “rise‐peak‐fall”. The rock samples primarily exhibit brittle failure, and the AE evolution mode is almost no falling stage. Coal and gas outbursts occur after the stress peak. Before coal and gas outbursts occur, there is a clear increasing trend in the AE ahead of the gas concentration variation. When the gas‐bearing coal is damaged by the load, the coal body first breaks due to the stress, and the AE value increases. Then, due to the fracture of the coal body, the crack penetrates, gas rushes out, and the gas concentration increases. The research results can provide an advanced technical method for the monitoring and early warning of coal–rock gas dynamic disasters, and improve the prediction accuracy for dynamic disasters.

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Study on acoustic–electric–heat effect of coal and rock failure processes under uniaxial compression

Cited by 37 publications

References 29 publications

Mixing Ratios and Cementing Mechanism of Similar Silty Mudstone Materials for Model Tests

Mixing Ratios and Cementing Mechanism of Similar Silty Mudstone Materials for Model Tests

Engineering properties of sandstone heated to a range of high temperatures

Acoustic emission monitoring technology for coal and gas outburst

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