摘要
以杏山铁矿为研究背景,结合矿山实际情况,基于随机介质放矿理论的覆盖层结构优化理论与露天转地下覆盖层回填自然分级理论,确定了杏山铁矿能满足防损失贫化、防冲击地压、阻滞水作用、减少漏风防寒保暖,可形成挤压爆破和端部放矿条件等安全功能的覆盖层厚度为45 m,形成方法为高台阶一次翻卸,并制定了详细的方案与技术保障措施。取得以下主要结论:①杏山铁矿覆盖层分整体下移层和流动层2层铺设,流动层回填废石粒度不小于20 mm,100 mm以上的粒度含量不小于40%,厚度不小于20 m。②整体下移层回填废石小于5 mm与大于5 mm的粗颗粒比例为3∶7,厚度不小于25 m。杏山铁矿实施覆盖层后的井下漏风率、矿石贫化率、井下泥石流和渗漏时间等指标评价数据良好,对类似矿山有指导借鉴意义。
Taking Xingshan Iron Mine as research background, combined with the actual situation of the mine, and based on the covering layer structure optimization theory of random media ore-drawing theory and natural grading theory of covering layer backfill from open pit to underground,the covering layer thickness of Xingshan Iron Mine is determined to be 45 m and the forming method is high step once dumping,which meet the safety functions of the anti-dilution losses, anti-rockburst, bloc- king water,reducing air leakage for cold proof, and forming the extrusion blasting and the end ore-drawing conditions. A de- tailed program and the technical guarantee measures are proposed. The main conclusions are as follows ：①Xingshan Iron Mine overlay layer have overall downward layer and flowing layer. The waste rock backfill size at flowing layer is not less than 20 mm,rock content of 100 mm or above is not less than 40% ,and the thickness is not less than 20 m. ②The waste rock backfill size of overall downward layer is smaller than 5mm,and has a ratio of 3：7 with that of greater than 5 mm. Its thickness is not less than 25 m. After the implementation of covering layer, Xingshan Iron Mine owned good evaluating index in the leakage rate, ore dilution rate, underground landslides and seepage time and other indicators. The research provides a guiding reference for similar mines.
出处
《金属矿山》
CAS
北大核心
2014年第1期25-28,共4页
Metal Mine
基金
河北省自然科学基金项目(编号:E2013209328)
关键词
露天转地下
覆盖层
高台阶翻卸
自然分级
Transition from open pit to underground, Covering layer, High bench tipping, Natural classification
