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[an error occurred while processing this directive]Experimental Study on the Effect of Pillar Blasting Mining on the Damage of Cemented Filling Body
Received date: 2019-11-08
Revised date: 2020-04-29
Online published: 2020-08-27
Based on the panel mining of Dahongshan Copper Mine,this paper attempts to solve the damage problem of adjacent cemented pillars.In order to determine the damage range of cement piles in the blasting and recovery of underground mines,the on-site cemented backfill of Dahongshan Copper Mine and the same strength of the pillar simulation materials were used to carry out the mine column blasting simulation test in the underground abandoned but safe roadway.Ultrasonic testing and post-explosion apparent crack observation method were used to investigate the damage law of cemented backfill under blasting load from two aspects of damage degree and crack propagation.The results show that the damage degree of the cemented backfill at the blasting distance R is 45~125 cm that is higher than that of the blasting core R is 145~205 cm;The crack at the cemented backing can be extended to 71.5 cm;In the model,the damage of cemented backfill is divided into stable zone,damage zone and failure zone.The damage degree of cemented backfill is 0≤D<0.07 in the stable zone,0.07≤D≤0.22 in the damaged zone,and 0.22<D≤1 in the failure zone.
Chunhui SONG , Xianglong LI , Jianguo WANG , Fei SONG . Experimental Study on the Effect of Pillar Blasting Mining on the Damage of Cemented Filling Body[J]. Gold Science and Technology, 2020 , 28(4) : 558 -564 . DOI: 10.11872/j.issn.1005-2518.2020.04.180
内蒙古找矿突破战略行动发现多处重要矿产地
内蒙古自治区自然资源厅8月11日发布消息,内蒙古找矿突破战略行动总结评估工作已全面完成,发现多处重要矿产地,全区矿产资源储量大幅增加。
内蒙古找矿突破战略行动2011年起实施以来,累计勘查投入311.97亿元,在基础地质调查、重要矿产勘查、老矿山找矿、科技支撑及矿产资源节约与综合利用等方面取得大量成果,产生了良好的经济社会效益。找矿突破战略行动新发现双尖子山银多金属矿床、扎拉格阿木铜矿床、曹四夭钼矿床和复兴屯银多金属矿床等112个大中型矿产地;完成了设立铁、铜、铅、锌、金等国家级重点矿种整装勘查区10~15处的目标;新发现7处大型及超大型铀矿床、特大型晶质石墨矿床等,晶质石墨查明资源储量增长近10倍左右;开展了“三稀”矿产调查评价工作,发现了赵井沟大型铌钽矿床和巴仁扎拉格铀—铌矿床。
此外,找矿突破战略行动首次在鄂尔多斯市发现页岩气;相继发现了乌海市乌兰淖尔景区、鄂尔多斯市恩格贝地区等10余个地区的地热田。页岩气、浅层地温能调查评价填补了自治区空白。
(来源:内蒙古自治区自然资源厅)
http://www.goldsci.ac.cn/article/2020/1005-2518/1005-2518-2020-28-4-558.shtml
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