矿井多煤层、多煤种条件下煤炭产品结构优化研究

当一个矿井开采多煤层、多煤种、不同特性的原煤时,如何确定产品结构,使煤炭资源得到合理利用、使企业获取最大利润,是企业重点考虑的问题。文章以新汶一矿的实际资料为例,进行了一个矿井的产品结构计算和计划开采比例的经济效益预测。结果表明,采用科学的方法,可以预测不同分选条件下的最佳经济效益,从而帮助煤炭生产企业进行产品结构的优化,并对矿井确定不同煤层的开采比例提供有益的参考。

Surface mining subsidence control based on grouting-recovery ratio theory

From an analysis of the relationships of grouting coefficients under the conditions of grouting reducing subsidence, it is concluded that the reducing subsidence rate is in direct proportion to the grouting-recovery ratio, and its proportional coefficient depends on the coefficient of reducing subsidence and collapsing coefficient.The coefficient for reducing subsidence volume φ=ΔV/V_(ash) is related to overburden lithology.The coefficient for reducing subsidence volume φ is always larger than 1.This improves the reducing subsidence rate,the grouting-recovery ratio, and the coefficient for reducing subsidence volume, which can maximize the control of surface subsidence.