The Experimental Investigation on Mechanics and Damage Characteristics of the Aeolian Sand Paste-like Backfill Materials Based on Acoustic Emission
With the wide application of the filling mining method, it is necessary to consider the influence of rock activity on the filling body, reflected in the laboratory, that is, the influence of loading rate. Therefore, to explore the response characteristics of loading rate on the mechanical and damage...
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| Format: | Article |
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MDPI AG
2022-10-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/20/7235 |
| _version_ | 1797471789426671616 |
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| author | Xiaoping Shao Chuang Tian Chao Li Zhiyu Fang Bingchao Zhao Baowa Xu Jianbo Ning Longqing Li Renlong Tang |
| author_facet | Xiaoping Shao Chuang Tian Chao Li Zhiyu Fang Bingchao Zhao Baowa Xu Jianbo Ning Longqing Li Renlong Tang |
| author_sort | Xiaoping Shao |
| collection | DOAJ |
| description | With the wide application of the filling mining method, it is necessary to consider the influence of rock activity on the filling body, reflected in the laboratory, that is, the influence of loading rate. Therefore, to explore the response characteristics of loading rate on the mechanical and damage characteristics of aeolian sand paste filling body, DNS100 electronic universal testing machine and DS5-16B acoustic emission (AE) monitoring system were used to monitor the stress–strain changes and AE characteristic parameters changes of aeolian sand paste filling body during uniaxial compression, and the theoretical model of filling sample damage considering loading rate was established based on AE parameters. The experimental results show that: (1) With the increase in loading rate, the uniaxial compressive strength and elastic modulus of aeolian sand paste-like materials (ASPM) specimens are significantly improved. ASPM specimens have ductile failure characteristics, and the failure mode is unidirectional shear failure → tensile failure → bidirectional shear failure. (2) When the loading rate is low, the AE event points of ASPM specimens are more dispersed, and the large energy points are less. At high loading rates, the AE large energy events are more concentrated in the upper part, and the lower part is more distributed. (3) The proportion of the initial active stage is negatively correlated with the loading rate, and the proportion of the active stage is positively correlated with the loading rate. The total number of AE cumulative ringing decreases with the increase in loading rate. (4) Taking time as an intermediate variable, the coupling relationship between ASPM strain considering loading rate and the AE cumulative ringing count is constructed, and the damage and stress coupling model of ASPM specimen considering loading rate is further deduced. Comparing the theoretical model with the experimental results shows that the model can effectively reflect the damage evolution process of ASPM specimens during loading, especially at high loading rates. The research results have significant reference value for subsequent strength design of filling material, selection of laboratory loading rate and quality monitoring, and early warning of filling body in goaf. |
| first_indexed | 2024-03-09T19:53:02Z |
| format | Article |
| id | doaj.art-54c543c9b5af4aee98bea825533f86bb |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T19:53:02Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-54c543c9b5af4aee98bea825533f86bb2023-11-24T01:04:23ZengMDPI AGMaterials1996-19442022-10-011520723510.3390/ma15207235The Experimental Investigation on Mechanics and Damage Characteristics of the Aeolian Sand Paste-like Backfill Materials Based on Acoustic EmissionXiaoping Shao0Chuang Tian1Chao Li2Zhiyu Fang3Bingchao Zhao4Baowa Xu5Jianbo Ning6Longqing Li7Renlong Tang8Energy School, Xi’an University of Science and Technology, Xi’an 710054, ChinaEnergy School, Xi’an University of Science and Technology, Xi’an 710054, ChinaShaanxi Coal and Chemical Technology Institute Co., Ltd., Xi’an 710054, ChinaEnergy School, Xi’an University of Science and Technology, Xi’an 710054, ChinaEnergy School, Xi’an University of Science and Technology, Xi’an 710054, ChinaEnergy School, Xi’an University of Science and Technology, Xi’an 710054, ChinaEnergy School, Xi’an University of Science and Technology, Xi’an 710054, ChinaEnergy School, Xi’an University of Science and Technology, Xi’an 710054, ChinaEnergy School, Xi’an University of Science and Technology, Xi’an 710054, ChinaWith the wide application of the filling mining method, it is necessary to consider the influence of rock activity on the filling body, reflected in the laboratory, that is, the influence of loading rate. Therefore, to explore the response characteristics of loading rate on the mechanical and damage characteristics of aeolian sand paste filling body, DNS100 electronic universal testing machine and DS5-16B acoustic emission (AE) monitoring system were used to monitor the stress–strain changes and AE characteristic parameters changes of aeolian sand paste filling body during uniaxial compression, and the theoretical model of filling sample damage considering loading rate was established based on AE parameters. The experimental results show that: (1) With the increase in loading rate, the uniaxial compressive strength and elastic modulus of aeolian sand paste-like materials (ASPM) specimens are significantly improved. ASPM specimens have ductile failure characteristics, and the failure mode is unidirectional shear failure → tensile failure → bidirectional shear failure. (2) When the loading rate is low, the AE event points of ASPM specimens are more dispersed, and the large energy points are less. At high loading rates, the AE large energy events are more concentrated in the upper part, and the lower part is more distributed. (3) The proportion of the initial active stage is negatively correlated with the loading rate, and the proportion of the active stage is positively correlated with the loading rate. The total number of AE cumulative ringing decreases with the increase in loading rate. (4) Taking time as an intermediate variable, the coupling relationship between ASPM strain considering loading rate and the AE cumulative ringing count is constructed, and the damage and stress coupling model of ASPM specimen considering loading rate is further deduced. Comparing the theoretical model with the experimental results shows that the model can effectively reflect the damage evolution process of ASPM specimens during loading, especially at high loading rates. The research results have significant reference value for subsequent strength design of filling material, selection of laboratory loading rate and quality monitoring, and early warning of filling body in goaf.https://www.mdpi.com/1996-1944/15/20/7235backfill miningloading ratemechanical propertiesacoustic emissioncumulative ringing countdamage constitutive model |
| spellingShingle | Xiaoping Shao Chuang Tian Chao Li Zhiyu Fang Bingchao Zhao Baowa Xu Jianbo Ning Longqing Li Renlong Tang The Experimental Investigation on Mechanics and Damage Characteristics of the Aeolian Sand Paste-like Backfill Materials Based on Acoustic Emission Materials backfill mining loading rate mechanical properties acoustic emission cumulative ringing count damage constitutive model |
| title | The Experimental Investigation on Mechanics and Damage Characteristics of the Aeolian Sand Paste-like Backfill Materials Based on Acoustic Emission |
| title_full | The Experimental Investigation on Mechanics and Damage Characteristics of the Aeolian Sand Paste-like Backfill Materials Based on Acoustic Emission |
| title_fullStr | The Experimental Investigation on Mechanics and Damage Characteristics of the Aeolian Sand Paste-like Backfill Materials Based on Acoustic Emission |
| title_full_unstemmed | The Experimental Investigation on Mechanics and Damage Characteristics of the Aeolian Sand Paste-like Backfill Materials Based on Acoustic Emission |
| title_short | The Experimental Investigation on Mechanics and Damage Characteristics of the Aeolian Sand Paste-like Backfill Materials Based on Acoustic Emission |
| title_sort | experimental investigation on mechanics and damage characteristics of the aeolian sand paste like backfill materials based on acoustic emission |
| topic | backfill mining loading rate mechanical properties acoustic emission cumulative ringing count damage constitutive model |
| url | https://www.mdpi.com/1996-1944/15/20/7235 |
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