白音哈尔矿薄及中厚破碎倾斜矿体开采技术研究

赋存于构造蚀变破碎带中的薄及中厚复杂倾斜矿体,具有蚀变较强,近矿围岩破碎,稳固性差等特点。针对白音哈尔矿的开采条件选择分段留矿崩落采矿法开采。根据随机介质放矿理论对矿体流动参数进行了试验测试与计算,结合放矿相似模拟试验对采场结构参数进行了分析。在岩石力学试验和现场结构面调查基础上,对破碎岩体质量指标进行了评价和岩体力学参数分析,并对回采巷道支护效果进行了数值模拟。结果表明:采用分段留矿崩落采矿法开采时,回采炮孔最小边孔角选择45°,分段高度13 m时崩矿步距为2 m;回采时应逐分段回采,避免多分段同时开采。研究结果可为白音哈尔矿安全高效开采提供理论支撑。

Research on mining technology for thin and medium thick broken inclined ore body of Baiyinhaer Mine

The thin and medium thick complex inclined ore bodies occurring in the structural alteration broken zone have the characteristics of strong alteration,broken surrounding rock near the ore,poor stability and so on.On the basis of the mining conditions of Baiyinhaer Mine,sublevel shrinkage caving mining method is selected for mining.The ore body flow parameters are tested and calculated according to the random medium ore drawing theory,and based on the similar simulation test of ore drawing,the stope structure parameters are analyzed.On the basis of rock mechanics test and on-site structural plane investigation,the quality index of broken rock mass is evaluated and the rock mass mechanical parameters are analyzed,and the support effect of mining roadway is numerically simulated.The results show that when the sublevel shrinkage caving mining method is adopted,the minimum side hole angle of the blasthole is 45°,and the caving step is 2 m when the sublevel height is 13 m;the sublevel mining should be done step by step to avoid multi-stage simultaneous mining.The research results provide theoretical basis for safe and efficient mining in Baiyinhaer Mine.