Experimental study on the evolution characteristics of gas pressure field for true triaxial cyclic mining
The evolution characteristics of coal seam strain and gas pressure in circular mining were explored by conducting physical simulation tests on the influence of cyclic stress on coal seam parameters under different initial gas pressures using a large true triaxial physical simulation test rig. The ev...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-04-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2023.1080472/full |
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| author | Jiabo Geng Jiabo Geng Jiabo Geng Jiabo Geng Jiangtong Liu Gaoxiong Zeng Dongming Zhang Dongming Zhang Zhigguo Guo Jiang Xu |
| author_facet | Jiabo Geng Jiabo Geng Jiabo Geng Jiabo Geng Jiangtong Liu Gaoxiong Zeng Dongming Zhang Dongming Zhang Zhigguo Guo Jiang Xu |
| author_sort | Jiabo Geng |
| collection | DOAJ |
| description | The evolution characteristics of coal seam strain and gas pressure in circular mining were explored by conducting physical simulation tests on the influence of cyclic stress on coal seam parameters under different initial gas pressures using a large true triaxial physical simulation test rig. The evolution characteristics of gas pressure and coal seam strain with the number of cycles and gas pressure were discussed. The test results showed that during cyclic loading and unloading, the coal seam is cracked under stress and new cracks are generated, and the new fractures cause the overall pressure of the coal seam methane to decrease by adsorbing more free gas. In the loading stage, the coal skeleton is squeezed by stress, which causes the space of coal seam pores and cracks to shrink, the free gas in the pores and fractures of the coal seam is extruded, and the strain and gas pressure of the coal seam increase with the increase of stress. In the unloading stage, the reduction of stress leads to the coal skeleton tending to return to its initial state, the free gas in the pores is transported and enriched into the fractures of the coal seam, and the strain and gas pressure of the coal seam are gradually reduced. With the increase of the number of cycles, the damage of the coal seam increases and deformation occurs, the increasing amplitude of gas pressure gradually increases during loading, and the decreasing amplitude of gas pressure gradually decreases when unloading, and the closer the distance from the pressurized boundary, the greater the amplitude change. Under different initial gas pressure conditions, the greater the initial gas pressure, the greater the increasing amplitude of gas pressure and the smaller the decreasing amplitude. |
| first_indexed | 2024-04-09T17:02:29Z |
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| id | doaj.art-d92c3c2994f74215b143adaee715133d |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-09T17:02:29Z |
| publishDate | 2023-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-d92c3c2994f74215b143adaee715133d2023-04-21T04:36:09ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-04-011110.3389/feart.2023.10804721080472Experimental study on the evolution characteristics of gas pressure field for true triaxial cyclic miningJiabo Geng0Jiabo Geng1Jiabo Geng2Jiabo Geng3Jiangtong Liu4Gaoxiong Zeng5Dongming Zhang6Dongming Zhang7Zhigguo Guo8Jiang Xu9School of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou, ChinaSinosteel Maanshan General Institute of Mining Research Co. Ltd, Maanshan, Anhui, ChinaGanzhou Key Laboratory of Industrial Safety and Emergency Technology, Ganzhou, ChinaCenter for Emergency Management and Multidisciplinary Innovation Research, Jiangxi University of Science and Technology, Ganzhou, ChinaSchool of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou, ChinaSchool of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou, ChinaSchool of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou, ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, ChinaSchool of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou, ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, ChinaThe evolution characteristics of coal seam strain and gas pressure in circular mining were explored by conducting physical simulation tests on the influence of cyclic stress on coal seam parameters under different initial gas pressures using a large true triaxial physical simulation test rig. The evolution characteristics of gas pressure and coal seam strain with the number of cycles and gas pressure were discussed. The test results showed that during cyclic loading and unloading, the coal seam is cracked under stress and new cracks are generated, and the new fractures cause the overall pressure of the coal seam methane to decrease by adsorbing more free gas. In the loading stage, the coal skeleton is squeezed by stress, which causes the space of coal seam pores and cracks to shrink, the free gas in the pores and fractures of the coal seam is extruded, and the strain and gas pressure of the coal seam increase with the increase of stress. In the unloading stage, the reduction of stress leads to the coal skeleton tending to return to its initial state, the free gas in the pores is transported and enriched into the fractures of the coal seam, and the strain and gas pressure of the coal seam are gradually reduced. With the increase of the number of cycles, the damage of the coal seam increases and deformation occurs, the increasing amplitude of gas pressure gradually increases during loading, and the decreasing amplitude of gas pressure gradually decreases when unloading, and the closer the distance from the pressurized boundary, the greater the amplitude change. Under different initial gas pressure conditions, the greater the initial gas pressure, the greater the increasing amplitude of gas pressure and the smaller the decreasing amplitude.https://www.frontiersin.org/articles/10.3389/feart.2023.1080472/fullcyclic loading and unloadinginitial gas pressurestrainchange in gas pressurecoal permeability field |
| spellingShingle | Jiabo Geng Jiabo Geng Jiabo Geng Jiabo Geng Jiangtong Liu Gaoxiong Zeng Dongming Zhang Dongming Zhang Zhigguo Guo Jiang Xu Experimental study on the evolution characteristics of gas pressure field for true triaxial cyclic mining Frontiers in Earth Science cyclic loading and unloading initial gas pressure strain change in gas pressure coal permeability field |
| title | Experimental study on the evolution characteristics of gas pressure field for true triaxial cyclic mining |
| title_full | Experimental study on the evolution characteristics of gas pressure field for true triaxial cyclic mining |
| title_fullStr | Experimental study on the evolution characteristics of gas pressure field for true triaxial cyclic mining |
| title_full_unstemmed | Experimental study on the evolution characteristics of gas pressure field for true triaxial cyclic mining |
| title_short | Experimental study on the evolution characteristics of gas pressure field for true triaxial cyclic mining |
| title_sort | experimental study on the evolution characteristics of gas pressure field for true triaxial cyclic mining |
| topic | cyclic loading and unloading initial gas pressure strain change in gas pressure coal permeability field |
| url | https://www.frontiersin.org/articles/10.3389/feart.2023.1080472/full |
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