Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams
Under the condition of close-distance double-thick coal seams’ mining, the serious strata behavior occurred in the lower retracement channel, which is affected by the double disturbance with upper coal-pillar static load and mining dynamic pressure. Field investigation, laboratory test, and numerica...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2021/6651099 |
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| author | Fulian He Kai Lv Xiaobin Li Binbin Qin Liang Li |
| author_facet | Fulian He Kai Lv Xiaobin Li Binbin Qin Liang Li |
| author_sort | Fulian He |
| collection | DOAJ |
| description | Under the condition of close-distance double-thick coal seams’ mining, the serious strata behavior occurred in the lower retracement channel, which is affected by the double disturbance with upper coal-pillar static load and mining dynamic pressure. Field investigation, laboratory test, and numerical simulation were used to study the failure characteristics and stress distribution of N0381 retracement channel. The results show that the plastic failure and stress of the surrounding rock are obviously asymmetric; specifically, the closer the roof is to N0381 gob, the stronger the strata behavior is. In addition, when the upper coal pillar is in critical stable or stable state (w/h>2), high stress concentration in the upper coal pillar is transmitted downward through floor rock so that two dangerous areas with severe strata behavior are formed in N0381 retracement channel. In view of this, a partition control strategy with “high-pressure water jet + asymmetric high-strength cable-beam net + three-hole anchor cable group + roof grouting” as the core is proposed to ensure the stability of the lower retracement channel. This study provides a reference for coal mines with similar production geological conditions. |
| format | Article |
| id | doaj-art-08a35c67be63405d8e7c8969f739a0d9 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-08a35c67be63405d8e7c8969f739a0d92025-02-03T00:58:47ZengWileyShock and Vibration1070-96221875-92032021-01-01202110.1155/2021/66510996651099Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal SeamsFulian He0Kai Lv1Xiaobin Li2Binbin Qin3Liang Li4School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaUnder the condition of close-distance double-thick coal seams’ mining, the serious strata behavior occurred in the lower retracement channel, which is affected by the double disturbance with upper coal-pillar static load and mining dynamic pressure. Field investigation, laboratory test, and numerical simulation were used to study the failure characteristics and stress distribution of N0381 retracement channel. The results show that the plastic failure and stress of the surrounding rock are obviously asymmetric; specifically, the closer the roof is to N0381 gob, the stronger the strata behavior is. In addition, when the upper coal pillar is in critical stable or stable state (w/h>2), high stress concentration in the upper coal pillar is transmitted downward through floor rock so that two dangerous areas with severe strata behavior are formed in N0381 retracement channel. In view of this, a partition control strategy with “high-pressure water jet + asymmetric high-strength cable-beam net + three-hole anchor cable group + roof grouting” as the core is proposed to ensure the stability of the lower retracement channel. This study provides a reference for coal mines with similar production geological conditions.http://dx.doi.org/10.1155/2021/6651099 |
| spellingShingle | Fulian He Kai Lv Xiaobin Li Binbin Qin Liang Li Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams Shock and Vibration |
| title | Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams |
| title_full | Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams |
| title_fullStr | Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams |
| title_full_unstemmed | Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams |
| title_short | Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams |
| title_sort | failure mechanism and control of lower retracement channel in close distance double thick coal seams |
| url | http://dx.doi.org/10.1155/2021/6651099 |
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