Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition
Ultrasonic technology can be applied to study the changes in the internal defects of coal under quantitative loading, which can provide the theoretical basis for applying the technology to determine the structural stability of coal and predict disasters related to the dynamics of coal or rock. In th...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2017-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2017/7643451 |
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| _version_ | 1832558832431136768 |
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| author | Xiaofei Liu Xiaoran Wang Enyuan Wang Zhentang Liu Xiaoyang Xu |
| author_facet | Xiaofei Liu Xiaoran Wang Enyuan Wang Zhentang Liu Xiaoyang Xu |
| author_sort | Xiaofei Liu |
| collection | DOAJ |
| description | Ultrasonic technology can be applied to study the changes in the internal defects of coal under quantitative loading, which can provide the theoretical basis for applying the technology to determine the structural stability of coal and predict disasters related to the dynamics of coal or rock. In this paper, to investigate the propagation laws of ultrasonic signals through a coal material under various loading conditions, an ultrasonic test system for the deformation and fracture of coal rock was used and a cyclic loading and unloading pattern is adopted. In addition, changes in ultrasonic parameters such as amplitude, dominant frequency, and velocity were analyzed. At the initial loading stage, the ultrasonic amplitude, amplitude of the dominant frequency, and wave velocity slightly decrease as the loading process progresses, and these three ultrasonic parameters gradually increase to their maxima when the stress level reaches approximately 46%. When it progresses from the linear elastic stage to the elastic plastic stage, the material inside the coal distorts and fractures more drastically, the inner defects are fully developed, and the acoustic parameters decrease significantly. Therefore, the corresponding measures should be adapted to reduce the loading stress before the coal is loaded to its critical stress level. |
| format | Article |
| id | doaj-art-dda6e9ae90074bea8fc21b99a4b3cbdc |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-dda6e9ae90074bea8fc21b99a4b3cbdc2025-02-03T01:31:29ZengWileyShock and Vibration1070-96221875-92032017-01-01201710.1155/2017/76434517643451Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading ConditionXiaofei Liu0Xiaoran Wang1Enyuan Wang2Zhentang Liu3Xiaoyang Xu4Key Laboratory of Coal Mine Gas and Fire Prevention and Control of the Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaKey Laboratory of Coal Mine Gas and Fire Prevention and Control of the Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaKey Laboratory of Coal Mine Gas and Fire Prevention and Control of the Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaUltrasonic technology can be applied to study the changes in the internal defects of coal under quantitative loading, which can provide the theoretical basis for applying the technology to determine the structural stability of coal and predict disasters related to the dynamics of coal or rock. In this paper, to investigate the propagation laws of ultrasonic signals through a coal material under various loading conditions, an ultrasonic test system for the deformation and fracture of coal rock was used and a cyclic loading and unloading pattern is adopted. In addition, changes in ultrasonic parameters such as amplitude, dominant frequency, and velocity were analyzed. At the initial loading stage, the ultrasonic amplitude, amplitude of the dominant frequency, and wave velocity slightly decrease as the loading process progresses, and these three ultrasonic parameters gradually increase to their maxima when the stress level reaches approximately 46%. When it progresses from the linear elastic stage to the elastic plastic stage, the material inside the coal distorts and fractures more drastically, the inner defects are fully developed, and the acoustic parameters decrease significantly. Therefore, the corresponding measures should be adapted to reduce the loading stress before the coal is loaded to its critical stress level.http://dx.doi.org/10.1155/2017/7643451 |
| spellingShingle | Xiaofei Liu Xiaoran Wang Enyuan Wang Zhentang Liu Xiaoyang Xu Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition Shock and Vibration |
| title | Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition |
| title_full | Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition |
| title_fullStr | Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition |
| title_full_unstemmed | Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition |
| title_short | Study on Ultrasonic Response to Mechanical Structure of Coal under Loading and Unloading Condition |
| title_sort | study on ultrasonic response to mechanical structure of coal under loading and unloading condition |
| url | http://dx.doi.org/10.1155/2017/7643451 |
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