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Protective coal seam and unmanned thin coal seam mining method
A protective coal seam and unmanned thin coal seam mining method comprises technological steps as follows: 1, a full coal thick strip with the width of 2-3 m is mined on a protective coal seam or an unmanned coal seam, and then enclosed space is formed by the full coal thick strip; 2, the mined full coal thick strip is filled with a degradable material to form a support body; 3, a next full coal thick strip with the width of 2-3 m is mined by skipping a temporary coal pillar with the width of 2-3 m, and the mined full coal thick strip is filled with the degradable material; 4, the step 2 is repeated for multiple times, and all temporary coal pillars are mined one by one after the mining is proceeded to certain area; 5, degradation conditions of the degradable material are created, that is, closed conditions are removed, a roof support is started to release, and overlying rock is subsided in the support compression process. According to the method, the support is automatically decomposed step by step after recovery, so that the overlying rock in a recovery zone is slowly and uniformly subsided and unloaded, rock burst and sudden massive surge of gas are effectively prevented, and the impact pressure of a roof is relieved, the roof caving is prevented.
Protective coal seam and unmanned thin coal seam mining method
A protective coal seam and unmanned thin coal seam mining method comprises technological steps as follows: 1, a full coal thick strip with the width of 2-3 m is mined on a protective coal seam or an unmanned coal seam, and then enclosed space is formed by the full coal thick strip; 2, the mined full coal thick strip is filled with a degradable material to form a support body; 3, a next full coal thick strip with the width of 2-3 m is mined by skipping a temporary coal pillar with the width of 2-3 m, and the mined full coal thick strip is filled with the degradable material; 4, the step 2 is repeated for multiple times, and all temporary coal pillars are mined one by one after the mining is proceeded to certain area; 5, degradation conditions of the degradable material are created, that is, closed conditions are removed, a roof support is started to release, and overlying rock is subsided in the support compression process. According to the method, the support is automatically decomposed step by step after recovery, so that the overlying rock in a recovery zone is slowly and uniformly subsided and unloaded, rock burst and sudden massive surge of gas are effectively prevented, and the impact pressure of a roof is relieved, the roof caving is prevented.
Protective coal seam and unmanned thin coal seam mining method
ZHANG BUQIN (author) / ZHANG CHAO (author) / WANG MUDE (author)
2015-12-02
Patent
Electronic Resource
English
IPC:
E21C
Bergbau oder Steinbruchbetrieb
,
MINING OR QUARRYING
/
C04B
Kalk
,
LIME
/
E21F
Sicherheitsvorrichtungen, Förderung, Auffüllen oder Bergversatz, Rettungswesen, Bewetterung oder Entwässerung in oder von Gruben oder Tunnels
,
SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINAGE IN OR OF MINES OR TUNNELS
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