烧变岩侵蚀条件下倾斜煤层露天矿分区境界优化

Division boundary optimization of inclined coal seam in open-pit mine under eroded burnt rock

为了优化烧变岩侵蚀条件下倾斜煤层露天矿分区境界,分析了新疆煤田烧变岩赋存特点,以及煤、岩层赋存情况的随机性,以神华新疆能源有限责任公司黑山露天煤矿为例,通过构建模拟开采境界,揭示了境界剥采比与平均剥采比随分区境界外扩的变化规律,确定了烧变岩侵蚀露天矿分区境界圈定的原则及适用条件;通过SMCAD软件构建了黑山露天煤矿三维仿真境界;提出了通过建立煤、岩层层状属性块体模型,用块量反验方式校验三维境界的方法。研究结果表明:黑山露天煤矿经济合理剥采比nj为8.06 m^3/t,满足了境界剥采比n0=4.4 m^3/t≤nj条件,即存在以"境界剥采比小于或等于经济合理剥采比"为原则确定的合理境界;采用块量反验方法得到其块量里收境界剥采比与块量外扩境界剥采比,从三维角度实现了反验设计境界的合理性,由块量反验可知块量外扩分区境界剥采比nk,i^+=8.05 m^3/t≤nj,合理确定了外扩境界,从而实现了烧变岩侵蚀条件下露天矿经济效益的最大化。

In order to optimize the division boundary optimization of inclined coal seam in open-pit mine under the erosion condition of burnt rock,the characteristics of burnt rock occurrence and the randomness of coal and rock occurrence in Xinjiang coalfield were analyzed.Taking Heishan Open-Pit Coal Mine of Shenhua Xinjiang Energy Co.,Ltd.as the background,by constructing the simulated mining boundary,the variation rule of boundary stripping ratio and average stripping ratio with the expansion of the partition boundary was revealed,and the principles and applicable conditions for the division boundary of the burnt rock erosion in open-pit mines were determined.The SMCAD software were used to construct the 3 D simulation boundary of the Heishan Open-Pit Coal Mine.The method of verifying the three-dimensional state by the block inverse method was established by establishing the block model of coal and rock layered attributes.This research results have been applied in the mining practice of the Heishan Open-Pit Coal Mine.The research results show that the economic reasonable stripping ratioof Heishan Open-Pit Coal Mine is 8.06 m^3/t,which meets n0(boundary stripping ratio)is 4.4 m^3/t≤nj(economic reasonable stripping ratio).That is,there is a reasonable state determined based on the principle that the"state stripping ratio is less than or equal to the economically reasonable stripping ratio";The block amountreverse test was used to obtain the block stripping ratio and the block size outward expansion level stripping ratio,which realizes the rationality of the reverse tests design realm from the 3 D perspective,with the block amount reverse tests to determine division boundary ratio nk,i^+=8.05 m^3/t≤nj,and the reasonable boundary and maximize the economic benefit of the open pit mine under the condition of burnt rock erosion.