Mechanical Properties and Acoustic Emission Characteristics of Unloading Instability of Sandstone under High Stress
In order to analyze the law of unloading instability of deep rock mass, the unloading experiment of sandstone under different confining pressures was carried out, and the mechanical properties and acoustic emission characteristics of sandstone unloading failure under high stress were obtained. The r...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/6/722 |
| _version_ | 1797484162320433152 |
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| author | Zhiyuan Hou Fukun Xiao Gang Liu Oleg Viktorovich Bashkov Lan Lyu |
| author_facet | Zhiyuan Hou Fukun Xiao Gang Liu Oleg Viktorovich Bashkov Lan Lyu |
| author_sort | Zhiyuan Hou |
| collection | DOAJ |
| description | In order to analyze the law of unloading instability of deep rock mass, the unloading experiment of sandstone under different confining pressures was carried out, and the mechanical properties and acoustic emission characteristics of sandstone unloading failure under high stress were obtained. The results demonstrate that before unloading, the sandstone under low stress shows compression and elastic deformation, whereas that under high stress shows elastic deformation and plastic deformation. Moreover, the unloading behavior of sandstone under low stress is ductile, whereas that under high stress is brittle. Poisson’s ratio and elastic modulus have negative and positive correlation with initial confining pressure, respectively. During unloading, the higher the initial confining pressure is, the earlier the rock sample damage occurs. Prior to the accelerated damage stage, the unloading amount and AE cumulative count are inversely proportional and directly proportional to the initial confining pressure, respectively. The simultaneous occurrence of UHF, HF, MF, and LF in the AE power spectrum, as well as a steep increase in fractal dimension followed by a decrease, can be used as precursors to unloading instability in sandstone. |
| first_indexed | 2024-03-09T22:58:32Z |
| format | Article |
| id | doaj.art-d6222a9b546d4f86afa2412717968810 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-09T22:58:32Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-d6222a9b546d4f86afa24127179688102023-11-23T18:06:45ZengMDPI AGMinerals2075-163X2022-06-0112672210.3390/min12060722Mechanical Properties and Acoustic Emission Characteristics of Unloading Instability of Sandstone under High StressZhiyuan Hou0Fukun Xiao1Gang Liu2Oleg Viktorovich Bashkov3Lan Lyu4School of Safety Engineering, Heilongjiang University of Science and Technology, Harbin 150022, ChinaHeilongjiang Ground Pressure & Gas Control in Deep Mining Key Lab, Heilongjiang University of Science and Technology, Harbin 150022, ChinaHeilongjiang Ground Pressure & Gas Control in Deep Mining Key Lab, Heilongjiang University of Science and Technology, Harbin 150022, ChinaInstitute of Mechanical Engineering and Chemical Technologies, Komsomolsk-na-Amure State University, 681013 Komsomolsk-na-Amure, RussiaInstitute of Mechanical Engineering and Chemical Technologies, Komsomolsk-na-Amure State University, 681013 Komsomolsk-na-Amure, RussiaIn order to analyze the law of unloading instability of deep rock mass, the unloading experiment of sandstone under different confining pressures was carried out, and the mechanical properties and acoustic emission characteristics of sandstone unloading failure under high stress were obtained. The results demonstrate that before unloading, the sandstone under low stress shows compression and elastic deformation, whereas that under high stress shows elastic deformation and plastic deformation. Moreover, the unloading behavior of sandstone under low stress is ductile, whereas that under high stress is brittle. Poisson’s ratio and elastic modulus have negative and positive correlation with initial confining pressure, respectively. During unloading, the higher the initial confining pressure is, the earlier the rock sample damage occurs. Prior to the accelerated damage stage, the unloading amount and AE cumulative count are inversely proportional and directly proportional to the initial confining pressure, respectively. The simultaneous occurrence of UHF, HF, MF, and LF in the AE power spectrum, as well as a steep increase in fractal dimension followed by a decrease, can be used as precursors to unloading instability in sandstone.https://www.mdpi.com/2075-163X/12/6/722unloading instabilitymechanical propertiesacoustic emission characteristicsfailure precursor |
| spellingShingle | Zhiyuan Hou Fukun Xiao Gang Liu Oleg Viktorovich Bashkov Lan Lyu Mechanical Properties and Acoustic Emission Characteristics of Unloading Instability of Sandstone under High Stress Minerals unloading instability mechanical properties acoustic emission characteristics failure precursor |
| title | Mechanical Properties and Acoustic Emission Characteristics of Unloading Instability of Sandstone under High Stress |
| title_full | Mechanical Properties and Acoustic Emission Characteristics of Unloading Instability of Sandstone under High Stress |
| title_fullStr | Mechanical Properties and Acoustic Emission Characteristics of Unloading Instability of Sandstone under High Stress |
| title_full_unstemmed | Mechanical Properties and Acoustic Emission Characteristics of Unloading Instability of Sandstone under High Stress |
| title_short | Mechanical Properties and Acoustic Emission Characteristics of Unloading Instability of Sandstone under High Stress |
| title_sort | mechanical properties and acoustic emission characteristics of unloading instability of sandstone under high stress |
| topic | unloading instability mechanical properties acoustic emission characteristics failure precursor |
| url | https://www.mdpi.com/2075-163X/12/6/722 |
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