Stability analysis of insulating pillar of excavation of Chambishi copper mine in depth

作者：Zhao Xingdong^*

来源：Chinese Journal of Rock Mechanics and Engineering, 2010, 29(SUPPL. 1): 2616-2622.

• Deep mining
• Empirical equations
• Limit equilibrium method
• Limit equilibrium methods
• Limit span
• Limit span mechanism

The appropriate size and stability of insulating pillar, which are transition stretch shifting from shallow excavation to deep mining, are very important for safe production of deep mine. According to the field engineering condition shifting from shallow excavation to deep mining, the appropriate size of insulating pillar is calculated and analyzed by using methods of limit span mechanism, empirical equation method and limit equilibrium method. The analysis result shows that for guaranteeing the insulating pillar stability the thickness of insulating pillar is 21m. According to insulating pillar with thickness of 21m, original design scheme is revised. FLAC3D is adopted to analyze the stability of revised design scheme, deformation and failure process of insulating pillar during caving. The numerical result shows that when mine is excavated 33m high under insulating pillar, the insulating pillar will lose its strength and fail. Meanwhile, thickness of 28 m overburden layer is safe for non-hollow sublevel caving, which can guarantee the safety of personnel and equipment. It validates the revised insulating pillar thickness and conducts the production, which will supply the empirical method for the similar mine.

• 出版日期2010
• 单位东北大学