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| Research and practice of gob-side entry retaining technology under complex conditions |
| Zhang Bo |
| Xingtai Mine, Jizhong Energy Co., Ltd., Xingtai 054000, China |
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Abstract In order to prevent spontaneous combustion of gob-side entry retaining and goaf in coal mining face under extremely complex conditions of high buried depth, according to the support methods and effects of gob-side entry retaining such as dense row monomer and paste water filling often used in coal mines, Xingtai Mine adopts pre-splitting roof cutting and pressure relief technology of gob-side entry retaining in 25303 working face, the forming rate of gob-side entry retaining is greatly increased, which provides convenient conditions for gas and fire prevention and control in gob-side entry retaining goaf. The project focuses on the fire prevention and extinguishing technology of gob-side entry retaining in 25300 mining area of Xingtai Mine. Based on the characteristics of high buried depth, complex geological conditions and high gas emission in this mining area, comprehensive measures such as optimizing roadway layout, monitoring and monitoring, spraying and plugging in goaf, pre-burying nitrogen ( slurry ) pipeline and spraying inhibitor are adopted. The results show that the ventilation and fire prevention measures effectively reduce the safety risk of spontaneous combustion in goaf.
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