溜井中矿石压力计算公式分析与讨论

溜井中矿石压力计算,主要是用杨森公式,其压力大小是溜井贮矿高度的函数。随着溜井贮矿高度增高,压力增大;初始增大很快,后增速减小,最后趋于稳定。金长宇等人做了溜井底部压力变化的数值模拟和室内试验,结论是:不同直径下无论放矿高度怎样变化,天平的读数基本保持不变,该结论与数值模拟的规律得到相互验证。杨森公式的计算结果与试验结论不相符的。近年来提出的矿石散体拱形压力计算公式的计算结果与试验结论基本吻合,为今后研究、设计和生产管理提供了依据。

Analysis and Discussion on Formula for Calculating Ore Pressure in Ore-Pass

The calculation of ore pressure in ore-pass is mainly based on Jansen''s formula, which assumes that the pressure is a function of ore storage height. According to Jansen''s formula, the pressure increases with ore storage height. The initial increase is very fast, then the growth rate decreases and finally tend to be stable. Jin Changyu et al. made numerical simulation and laboratory test for bottom pressure variation of ore-pass. The conclusion is that no matter how ore drawing height change under different diameter condition,the balance data remain basically unchanged. This conclusion is verified with the law of numerical simulation, but it is inconsistent with the calculation result of Jansen''s formula. The recent proposed formula for calculating arch pressure of ore bulk is basically in agreement with experimental results, which provide a basis for future research, design and production management.