采场底部结构斜面角优化研究

Study on Optimization of Slope Angle of Stope Bottom

阐述了地下采场底部结构的研究现状及存在的问题,全面分析了设计底部结构斜面角时需考虑的矿石粘性、自然安息角、拉底空间及底部结构大小、底部斜面冲击损伤等因素。构建了底部结构在受矿石频繁撞击时的理论模型。基于冲量损伤的原理,以某矿山地下采场为实例,采用FLAC3D力学模拟软件模拟了其底部结构在取不同斜面角时受爆落矿岩频繁冲击造成的损伤情况,结果表明:斜面角越大,底部结构塑性破坏区体积越小。根据模拟结果,结合底部结构斜面设计的影响因素,得出了该矿山底部结构最优斜面角。底部结构斜面角的优化研究对于地下矿山安全、高效、经济开采具有重要的现实意义。

The current researches of stope bottom structure and existed problems are elaborated, and the factors that should be taken into account during designing slope angle of stope bottom, including viscosity of ores, natural angle of repose, undercut space, the size of bottom structure, the impact damage of the slope at bottom, are comprehensively analyzed. A theoretical model is established for the bottom structure after being hit frequently. Taking the underground stope in a mine as an example, mechanical simulation software FLAC^3D is adopted, based on the impulse damage, to simulate the damage situation of bottom structure with different slope angles being repeatedly impacted by exploded ores. Results show that the larger the slope angle is, the smaller damaged plastic zone there is at the bottom structure. The optimal angle of the stope bottom structure in the mine has been obtained based on the simulation results, considering factors influencing the slope design of bottom structure. The study on the optimization of slope angle of bottom structure is of great practical significance to the safe, efficient and economical exploitation of underground stope.