基于靠帮开采的局部陡帮开采方式研究

基于靠帮开采下部境界外扩法和上部境界收缩法2种开采方式，结合露天边坡地层层序律和时效性特点，提出了下部边坡外扩陡帮和边坡内缩陡帮2种局部陡帮开采方法，并分别推导出剥采比计算公式。采用控制变量法研究了煤层厚度、岩层厚度、局部陡帮高度对剥采比的影响，得出上部境界收缩法与边坡内缩陡帮法对煤层厚度、岩层厚度的变化较为敏感的规律。以霍林河露天矿南区西帮为例进行分析，边坡内缩陡帮法为霍林河露天煤矿最佳陡帮开采方案，可减少5 605.95万元的生产投资。

Research on the Local Steep Slope Mining Methods Based on Steep End-slope Mining Theory

Based on two mining methods of the boundary extension method at lower part and the boundary contraction method at upper part with steep end-slope mining,and combined the law of superposition and the end-slope timeliness of open pit slope,the two local steep slope mining methods are put forward,that is,the steep slope extension at lower part and the slope contraction at upper part. Meanwhile, the stripping ratios of two methods were deduced. The controlling variates method was used to study the impact of the thickness of coal seam,the rock thickness and the height of the steep slope on the stripping rati-o. The conclusion is that the steep slope extension at lower part and the slope contraction at upper part are sensitive to the change of the thickness of coal seam and the cover thickness. With the western slope in south area of Huolinhe open-pit mine as a case,the steep slope contraction method was the optimal scheme for Huolinhe open-pit mine with 56 million RMB invest-ments saved.