摘要
急倾斜薄矿脉群开采多采用浅孔留矿法,该方法开采存在产量小、效率低,劳动强度大等不足。基于协同开采理念,对已有的薄矿脉开采方法进行了分析,设计了一种新型的集群连续化回采方法,即深孔分段空场上向嗣后充填连续采矿法。该方法将阶段划分为分段,分段内划分矿房,矿房内不留间柱和底柱,一步骤回采,随后进行充填,回采与充填间隔进行,同一个阶段内的矿房连续回采,再无后续作业。针对青海省某金矿6条矿脉(M5、M6、M7、M8、M9、M10),提出了间隔台阶式连续回采顺序,并对该回采顺序进行了数值模拟分析。结果表明:最大位移约为16.8 mm,最大主应力为0.076 7 MPa,实际塑性区范围为2~5 m,可达到安全规范要求。矿山实践表明:该采矿法贫化率为9.51%,损失率约为7.98%,采场生产能力为96 t/d,中段生产能力为576 t/d,与该类型矿床开采常用的浅孔留矿法相比(贫化率13.57%,损失率15.61%,单个矿房生产能力62 t/d),能有效提高矿山机械化连续开采水平,提升矿山生产能力和回采效率,有效确保多矿脉同时回采时的安全有序。
Shallow-hole shrinkage mining method is often adopted in mining of steeply inclined thin vein group,the shortcomings of small yield,low efficiency and high labor intensity of the method are existed.Based on synergistic mining theory,the existing thin vein mining methods are analyzed,a new type of cluster continuous mining method is designed,named as deep hole segmentation open stoping continuous mining method with upper post-filling.In this method,the stages are divided into sections,and sections are divided into chambers,no pillar and bottom pillar are left in chambers,and mining operation is carried out in one step,and then filling operation is done.Stoping and filling operations are carried out intervals.Continuous stoping operation is carried out in the same stage with no follow-up operations.In view of the six gold ore veins(named as M5,M6,M7,M8,M9,M10 respectively)of a gold mine in Qinghai Province,a sequential step-by-step continuous recovery sequence is proposed,and the sequence of the recovery is numerically simulated.The analysis results show that the maximum displacement is about 16.8 mm,the maximum principal stress is about 0.076 7 MPa,and the actual plastic zone range is 2~5 m,which can meet the safety requirements.The mining practice results of the mine show that:the mining method has a depletion rate of9.51%,ore loss rate of 7.98%,production capacity of 96 t/d and stope production capacity of 576 t/d,compared with the ordinary shallow-hole shrinkage mining method(the depletion rate is 13.57%,the ore loss rate is 15.61%and the production capacity of a single chamber is 62 t/d),the mining method proposed in this paper can effectively improve level of continuous mechanized mining operation,production capacity and stope efficiency effectively,besides that,it can also guarantee the safety and orderly when multiple ore veins are mined at the same time.
作者
聂兴信
甘泉
娄一博
高建
冯珊珊
Nie Xingxin;Gan Quan;Lou Yibo;Gao Jian;Feng Shanshan(School of Resources Engineering,Xi'an University of Architecture and Technology,710055 Xi'an,China)
出处
《金属矿山》
CAS
北大核心
2019年第9期28-33,共6页
Metal Mine
基金
国家自然科学基金项目(编号:51774288,51404182)
关键词
集群连续化采矿
急倾斜薄矿脉
浅孔留矿法
数值模拟
回采工艺
协同开采
Cluster continuous mining
Steeply inclined thin ore veins
Shallow-hole shrinkage mining method
Numerical simulation
Mining process
Synergistic mining