Stage deformation characteristics of natural and saturated crushed gangue with large particle size
This study investigates the deformation characteristics and energy consumption patterns of natural and saturated crushed gangue with large particle size during loading-constant load stage through compression test. The results show that: 1) The deformation of natural and saturated crushed gangue in t...
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Emergency Management Press
2024-12-01
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| Series: | 矿业科学学报 |
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| Online Access: | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2024903 |
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| author | LU Wei LU Yao LIAO Changlong LI Qinghai LI Weiyu JIANG Ning MU Wenqiang WANG Changxiang |
| author_facet | LU Wei LU Yao LIAO Changlong LI Qinghai LI Weiyu JIANG Ning MU Wenqiang WANG Changxiang |
| author_sort | LU Wei |
| collection | DOAJ |
| description | This study investigates the deformation characteristics and energy consumption patterns of natural and saturated crushed gangue with large particle size during loading-constant load stage through compression test. The results show that: 1) The deformation of natural and saturated crushed gangue in the loading stage accounts for more than 90% of the total deformation. The load gradient significantly affects the displacement deformation in the early stage, and the water also exerts major influence on the displacement deformation in the creep stage. 2) Under natural and saturated conditions, about 1/3 of the work is consumed by friction, while 2/3 by crushing; 3) Compared with the natural state, energy consumption and its variation rate are reduced in the full stage of saturated crushed gangue. The displacement curve shows an explicit three-stage pattern of sharp deformation, linear deformation and creep deformation. According to the first-order and second-order derivatives of the displacement curve, we proposed the judgment basis of the threestages of sharp-linear-creep deformation. When the deformation of crushed gangue exceeds 15%, we observed improved bearing capacity. By observing the gangue compression process, we found that the crushed gangue shows a more uniform internal force chain distribution in the saturated state, with a higher number of cracks, crack growth rate and secondary crushing rate than those in the natural state. Under natural and saturated conditions, when the top void ratio of crushed gangue exceeds 0.65, we observed the maximum secondary crushing rate, with the bottom void ratio of less than 0.45, as well as the minimum secondary crushing rate, with the middle void ratio remaining stable at about 0.5. The secondary crushing loss and the top sliding retention can offset each other. The present study could provide reference for the design, stability monitoring and prediction of coal gangue filling. |
| format | Article |
| id | doaj-art-b44f284bb937490cbecd1a694dfe872c |
| institution | Kabale University |
| issn | 2096-2193 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Emergency Management Press |
| record_format | Article |
| series | 矿业科学学报 |
| spelling | doaj-art-b44f284bb937490cbecd1a694dfe872c2025-01-14T08:46:55ZengEmergency Management Press矿业科学学报2096-21932024-12-019695396310.19606/j.cnki.jmst.2024903kykxxb-9-6-953Stage deformation characteristics of natural and saturated crushed gangue with large particle sizeLU Wei0LU Yao1LIAO Changlong2LI Qinghai3LI Weiyu4JIANG Ning5MU Wenqiang6WANG Changxiang7College of Safety Science and Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, ChinaCollege of Safety Science and Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, ChinaCollege of Safety Science and Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, ChinaCollege of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao Shandong 266590, ChinaCollege of Safety Science and Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, ChinaCollege of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao Shandong 266590, ChinaCollege of Resources and Civil Engineering, Northeastern University, Shenyang Liaoning 110000, ChinaCollege of Safety Science and Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, ChinaThis study investigates the deformation characteristics and energy consumption patterns of natural and saturated crushed gangue with large particle size during loading-constant load stage through compression test. The results show that: 1) The deformation of natural and saturated crushed gangue in the loading stage accounts for more than 90% of the total deformation. The load gradient significantly affects the displacement deformation in the early stage, and the water also exerts major influence on the displacement deformation in the creep stage. 2) Under natural and saturated conditions, about 1/3 of the work is consumed by friction, while 2/3 by crushing; 3) Compared with the natural state, energy consumption and its variation rate are reduced in the full stage of saturated crushed gangue. The displacement curve shows an explicit three-stage pattern of sharp deformation, linear deformation and creep deformation. According to the first-order and second-order derivatives of the displacement curve, we proposed the judgment basis of the threestages of sharp-linear-creep deformation. When the deformation of crushed gangue exceeds 15%, we observed improved bearing capacity. By observing the gangue compression process, we found that the crushed gangue shows a more uniform internal force chain distribution in the saturated state, with a higher number of cracks, crack growth rate and secondary crushing rate than those in the natural state. Under natural and saturated conditions, when the top void ratio of crushed gangue exceeds 0.65, we observed the maximum secondary crushing rate, with the bottom void ratio of less than 0.45, as well as the minimum secondary crushing rate, with the middle void ratio remaining stable at about 0.5. The secondary crushing loss and the top sliding retention can offset each other. The present study could provide reference for the design, stability monitoring and prediction of coal gangue filling.http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2024903water-bearing statedeformation under compressionenergy consumption characteristicssecondary crushing ratevoid ratio |
| spellingShingle | LU Wei LU Yao LIAO Changlong LI Qinghai LI Weiyu JIANG Ning MU Wenqiang WANG Changxiang Stage deformation characteristics of natural and saturated crushed gangue with large particle size 矿业科学学报 water-bearing state deformation under compression energy consumption characteristics secondary crushing rate void ratio |
| title | Stage deformation characteristics of natural and saturated crushed gangue with large particle size |
| title_full | Stage deformation characteristics of natural and saturated crushed gangue with large particle size |
| title_fullStr | Stage deformation characteristics of natural and saturated crushed gangue with large particle size |
| title_full_unstemmed | Stage deformation characteristics of natural and saturated crushed gangue with large particle size |
| title_short | Stage deformation characteristics of natural and saturated crushed gangue with large particle size |
| title_sort | stage deformation characteristics of natural and saturated crushed gangue with large particle size |
| topic | water-bearing state deformation under compression energy consumption characteristics secondary crushing rate void ratio |
| url | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2024903 |
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