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| Application and research on mine pressure monitoring system of gob-side entry retaining in Huaye Coal Industry |
| Zhao Wenbao1, Jia Yongqiang2, Wang Yanlong3 |
| 1. Mine Operations Branch of Kailuan Group Mining Engineering Co., Ltd., Tangshan 063000, China; 2. Shanxi Linxian Huaye Coal Industry Co., Ltd., Lvliang 033000, China; 3. Shanxi Yinfeng Technology Co., Ltd., Taiyuan 030000, China |
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Abstract Under the condition of No.4 coal composite roof, the key technology research on self-forming roadway without coal pillar was carried out in Huaye Coal Industry, and this technology was used in the return air crossheading of No.4105 Face. By using the technology of roof cutting and pressure relief directional pre-splitting and cutting, the constant resistance anchor cable reinforcement support and lagging temporary support measures were added to realize the gob-side entry retaining of self-forming roadway without coal pillar. Aiming at the mine pressure monitoring system in the working face and retaining roadway in the process of retaining roadway, a targeted design was carried out. Through online mine pressure monitoring and manual monitoring methods, the mine pressure changes of the working face and retaining roadway were analyzed, and the roof changes of the retaining roadway were mastered. The periodic weighting step of the retaining roadway side was 12.4 m, and the maximum working resistance was reduced by 4 %. At the same time, according to the mine pressure data, the variation law of the weighting step and the weighting strength of the working face was accurately analyzed, which provided a theoretical basis for the advance support of the working face and the temporary support of the retaining roadway. It was concluded that the retaining roadway was in a stable state when the working face was 200 m behind the roof cutting and pressure relief, and the temporary support could be withdrawn. It ensures the popularization and application of 110 working method of self-forming roadway without coal pillar in Huaye Coal Mine.
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