露天矿相邻采区间先压帮后留沟内排方式研究

Study on inner dumping methods of first pressing slop and ditch in the adjacent mining areas of the open-pit coal mine

分析了露天矿相邻采区间压帮和留沟内排方式的特点,结合全压帮与全留沟二者的优点,提出了先压帮后留沟的内排方式,并将其内排发展阶段分为压帮期和留沟期;采用数学期望法,建立了先压帮后留沟内排方式在压帮期与留沟期的单翼内排和双翼内排运距的公式,得出了在留沟期双翼内排变为单翼内排的条件;运用费用补偿法,建立了以压帮长度为单一变量的一元二次函数,确定了压帮内排转变为留沟内排的最优位置。将该方法应用于国能平庄煤业集团平西白音华一号露天矿,确定留沟期在留沟长度为455.5 m时由双翼内排转为单翼内排,确定在压帮长度为465 m时为最佳压帮位置。

Based on the analysis of the characteristics of the pressing slope and the ditch inner dumping in the adjacent mining areas of open-pit coal mine,combined with the advantages of the whole pressing slope and the whole ditch,the article puts forward the way of the pressing slope first and then ditch inner dumping,and divides the development stage into the pressing slope and the ditch stage.By using the mathematical expectation method,the formula of calculating the distance between single-wing inner dumping and the double-wing inner dumping of the pressing slope first and then ditch inner dumping during the period of the pressing slope and the ditch is established,and the condition that the double-wing inner dumping becomes the single-wing inner dumping at the ditch stage is obtained.The method of expense compensation is used to establish a quadratic function with the length of the pressing slope as a single variable.The method is applied to Pingxi Baiyinhua No.1 Open-pit Mine of Guoneng Pingzhuang Coal Industry Group to determine the ditch retention period when the double-wing inner dumping becomes single-wing inner dumping at the length of the ditch is 455.5 m,and to determine the best position of pressing slope when the covering length of the pressing slope is 465 m.