鸡笼山金矿矿体形态复杂,采用上向水平分层充填采矿法回采缓倾斜薄矿体存在生产能力低、劳动强度大、损失贫化控制难等问题。以鸡笼山金矿-340 m 401采场为工程背景,开展了分段空场尾砂充填采矿法的优化试验研究。现场工业试验表明:分...鸡笼山金矿矿体形态复杂,采用上向水平分层充填采矿法回采缓倾斜薄矿体存在生产能力低、劳动强度大、损失贫化控制难等问题。以鸡笼山金矿-340 m 401采场为工程背景,开展了分段空场尾砂充填采矿法的优化试验研究。现场工业试验表明:分段空场尾砂充填采矿法采用分段一次性充填,电耙、铲运机联合出矿,减少了材料消耗,采场生产能力达110 t/d,采矿损失率4%,矿石贫化率6%,取得了较好的应用效果。展开更多
An underground iron mine in China has been used as a case-study to research the subsidence due to ore extraction and backfilling during open stoping operations. A 3-D discontinuum numerical model was built incorporati...An underground iron mine in China has been used as a case-study to research the subsidence due to ore extraction and backfilling during open stoping operations. A 3-D discontinuum numerical model was built incorporating geologic complexities including faults and interfaces between different lithologies,and the stoping and backfilling sequence adopted from the mine plans. The stoping was carried out in two vertically stacked horizontal layers, with a total of 16 stopes. Large displacements of up to 50 cm were observed along the roof of the stopes, and a maximum surface subsidence of 22.5 cm was observed.Backfilling was found to eliminate subsequent displacements and subsidence. The extraction of the upper orebody was found to influence displacements in the lower orebody. Finally, a subsidence profile was constructed to show the subsidence at all locations along the length of the surface and region of influence on the surface.展开更多
文摘鸡笼山金矿矿体形态复杂,采用上向水平分层充填采矿法回采缓倾斜薄矿体存在生产能力低、劳动强度大、损失贫化控制难等问题。以鸡笼山金矿-340 m 401采场为工程背景,开展了分段空场尾砂充填采矿法的优化试验研究。现场工业试验表明:分段空场尾砂充填采矿法采用分段一次性充填,电耙、铲运机联合出矿,减少了材料消耗,采场生产能力达110 t/d,采矿损失率4%,矿石贫化率6%,取得了较好的应用效果。
基金the support from the National Natural Science Foundation of China (No. 51404024)partially funded by the NIOSH of the Centers for Disease Control and Prevention, USA through Contract No.200-201139886 given to the second author
文摘An underground iron mine in China has been used as a case-study to research the subsidence due to ore extraction and backfilling during open stoping operations. A 3-D discontinuum numerical model was built incorporating geologic complexities including faults and interfaces between different lithologies,and the stoping and backfilling sequence adopted from the mine plans. The stoping was carried out in two vertically stacked horizontal layers, with a total of 16 stopes. Large displacements of up to 50 cm were observed along the roof of the stopes, and a maximum surface subsidence of 22.5 cm was observed.Backfilling was found to eliminate subsequent displacements and subsidence. The extraction of the upper orebody was found to influence displacements in the lower orebody. Finally, a subsidence profile was constructed to show the subsidence at all locations along the length of the surface and region of influence on the surface.
