地下铝土矿破碎岩体高效爆破技术研究
投稿时间:2018-07-30  修订日期:2019-08-14  点此下载全文
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作者单位E-mail
黄 丹 北京矿冶科技集团有限公司 bgrimmhd@126.com 
陈 何 北京矿冶研究总院  
赵瑶瑶 山西华兴铝业有限公司  
王 昌 山西华兴铝业有限公司  
张英君 山西华兴铝业有限公司  
基金项目:国家重点研发计划(2016YFC0600709);国家国际科技合作专项(2015DFA60330)
中文摘要:山西省地下铝土矿为缓倾斜薄矿体,岩石坚硬但岩体破碎,直接粘土岩顶板受爆破冲击影响较大,导致掘进效率低、爆破进尺短,增加了顶板失稳的安全风险。本文通过未确知测度模型评价分析铝土矿可爆性等级为Ⅳ级,为爆破设计及直眼掏槽抛掷方案提供支撑,提出中心双空孔超深滞后抛掷直眼掏槽和光面爆破技术,通过现场爆破试验,断面3m×2.5m、炮孔深度2.1m时,有效进尺>1.85m,单进尺长度提高约0.25m,炸药单耗由0.73kg/t降至0.6kg/t,单进尺炮孔数减少2个,爆破块度均匀,爆破后顶板平整。
中文关键词:铝土矿  破碎岩体  可爆性  直眼掏槽  光面爆破
 
Study on high efficiency blasting technology of fractured rock mass in underground bauxite mine
Abstract:The underground bauxite in Shanxi Province is a thin ore body with gentle slope. The rock is hard but the mass is broken. The clay rock direct roof is greatly affected by blasting shock. The blasting efficiency is low and the advance of drilling footage is short that increase the safety risk of roof instability. Through the analysis of the unascertained measurement model, the blast-ability of bauxite rock mass is Ⅳ level. It provides support for the blasting design and the throwing scheme of vertical hole cutting. The technologies of vertical hole cut of deeper delayed projectile with central double cavity and smooth blasting were proposed. Through field blasting test, 3m×2.5m tunnel section with 2.1m depth holes, mean effective penetration was >1.85m. Single footage length was increased by about 0.25m. Specific charge was reduced from 0.73kg/t to 0.6kg/t. 2 blasting holes were reduced in every single footage. The rock fragmentation was uniform and the roof was flat after blasting.
keywords:bauxite deposit  fractured rock mass  blast-ability  cylinder cut  smooth blasting
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