河曲露天矿陷落柱开采可行性分析

Feasibility analysis of collapse pillar mining in Hequ Open-pit Mine

为了研究河曲露天矿陷落柱开采的可行性,对陷落柱形成原因和地层产状进行了具体分析;采用数值模拟软件分析了陷落柱北帮、南帮、西帮边坡的稳定性,并给出了各帮的合理边坡角度;基于露天开采基本原理,计算了河曲露天矿的经济合理剥采比,进一步提出并优选陷落柱开采方案,研究结果表明:陷落柱北帮、南帮和西帮的合理边坡角度分别为41°、43°和30°,河曲露天矿的经济合理剥采比为6.2m^(3)/t,提出的陷落柱内资源全部开采、部分开采、不开采三种方案的剥采比分别为2.51m^(3)/t、2.37m^(3)/t和4.02m^(3)/t,均小于经济合理剥采比。因此,陷落柱内部资源经济可采,且资源全部开采方案的经济效益最优。

In order to study the feasibility of mining collapse column in Hequ Open-pit Mine, the formation causes and strata occurrence of collapse column are analyzed;numerical simulation is used to analyze the stability of the north slope, south slope and west slope of the collapse column, and the reasonable slope angle of each slope is given;based on the basic principle of open-pit mining, the economic and reasonable stripping ratio of Hequ Open-pit Mine is calculated, and the collapse column mining scheme is proposed and optimized. The research results show that the reasonable slope angles of the north, south and west slopes of the collapse column are 41°, 43° and 30°, respectively, and the economic and reasonable stripping ratio of Hequ Open-pit Mine is 6.2 m^(3)/t. The fully exploited, partially exploited and un-exploited schemes are proposed for the collapse column resources. The stripping ratio of the three schemes are 2.51 m^(3)/t, 2.37 m^(3)/t and 4.02 m^(3)/t, respectively, which are all less than the economic and reasonable stripping ratio, indicating the resources inside the collapse column are economically recoverable, and the economic benefit of the fully exploited scheme is the best.