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| Research on roof movement law of upward mining under high intensity mining conditions |
| He Shangsen1, Sun Chuang2, 3 |
| 1. Consulting Center, China National Coal Association, Beijing 100013, China; 2. Research Institute of Mine Big Data, China Coal Research Institute, Beijing 100013, China； 3. State Key Laboratory of Coal Mining and Clean Utilization, Beijing 100013, China |
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Abstract Taking two closely distance coal seams in a certain mine in Xinjiang as the engineering background, the changes in roof movement of the upper coal seam working face during the transition process between non upward mining and upward mining were investigated. By dividing the mining process of the upper coal seam working face into "before entering the goaf", "above the goaf", and "after exiting the goaf" based on the position of the working face, three sets of similar simulation tests were designed and analyzed in combination with engineering conditions. The research results indicated that: ① When the upper coal seam working face was located above the non goaf area, there was no significant difference in roof movement between its mining process and the general production working face. ② When the upper coal seam working face was located above the goaf, the degree of roof damage increased and overall cutting instability occured. ③ In the transition area between upward and non upward mining stages, the stability of the roof was poor and there were differences before and after, which greatly increased the difficulty of surrounding rock control. The research results provided a basis for understanding the stability changes of surrounding rock during upward mining of working faces.
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