锡林浩特萤石矿副井保安矿柱稳固技术研究

锡林浩特萤石矿采用留矿法开采，随着空区长时间暴露及井下采动不断影响，保安矿柱遭受了不同程度的破坏，导致副井安全运行受到严重威胁。为解除这一威胁，采用FLAC 3D数值模拟方法对四、五中段保安矿柱范围内矿体开挖与充填前后，副井附近的应力及位移变化情况进行了模拟分析，证实了开挖对竖井造成的威胁及充填对竖井保护的有利作用。基于此，研究提出顺次崩落中段遗留顶柱与地表塌陷坑同步废石充填相结合的保安矿柱稳固措施，并对充填后矿柱范围内剩余空区实施二次补充，实现了保安矿柱破坏范围的有效充填，为矿山安全、绿色、高效开采提供了有力保障。

Study on the Stabilization Technology of the Security Pillar of Auxiliary Shaft in Xilinhaote Fluorite Mine

The shrinkage mining method is adopted in the Xilinhaote fluorite mine. With the long-term exposure of goaf and the continuous disturbance of underground mining， the security pillars have been damaged to a varying degree， resulting in serious threats to the safe operation of the auxiliary shaft. In order to release this threat， FLAC 3D numerical simulation method is used to simulate and analyze the changes of stress and displacement near the auxiliary shaft before and after the excavation and filling of the security pillars in the fourth and fifth middle section. This confirmed that the excavation threatened to the shaft and the filling was beneficial to the shaft protection. Based on this， the stabilization measures for security pillars with combination of the subsequent caving of the middle retained pillars and the synchronous waste rock filling to the surface collapse pits was put forward. In addition， a secondary backfilling was performed for the remained goafs in the filled pillars. The effective filling at the damaged zone of the security pillar can be realized. This may provide a powerful guarantee for the safe， green and efficient mining.