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| Determination method of support resistance in high-intensity mining face of Yangchangwan Mine |
| Feng Tao |
| Yangchangwan Coal Mine National Energy Group Ningxia Coal Industry Co．，Ltd．，Yinchuan 751400, China |
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Abstract Aiming at the large-scale roof cutting problem that was easy to occur in the process of multi-seam mining in Yangchangwan Mine, theoretical analysis and numerical calculation were used to analyze the causes. Affected by the second coal mining, the structure of the first coal and the surrounding rock was damaged, and the roof structure itself could not maintain balance during the first coal mining, resulting in instability and roof disaster. The movement trajectory of single key block in stope roof showed that if the working face was advanced at a high speed during the weighting period, the possibility of disasters increased. The mining of lower coal leaded to a large degree of damage to the overlying strata affected by mining, which increased the probability of sliding instability of the single key block structure of the roof and caused the roof step subsidence. According to the size of the control top distance, the single key block structure had two instability modes of free falling and rotary, and the dynamic load method was used to calculate the maximum impact force of the support under the two instability modes. With the increase of working face length, the dynamic load above the basic roof was greater than the ultimate bearing capacity of the roof under the simple condition, and the surrounding and middle fracture lines of the roof appeared at the same time, which improved the weighting strength of the working face. Finally, the numerical calculation method was used to verify that it was reasonable to select the hydraulic support with rated working resistance of 9000 kN under the condition that the length of No.120101 Face in Yangchangwan Mine was 195 m.
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