陡倾斜薄矿体浅孔留矿法采场围岩稳定性分析  

Stability analysis of surrounding rock of stope with shallow hole retention method for steeply inclined thin ore body

作　　者：翟会超 杨勇 胡巍巍 董志富 孙长坤 ZHAI Hui-chao;YANG Yong;HU Wei-wei;DONG Zhi-fu;SUN Chang-kun(Yunnan Gold Mining Group Co.Ltd.,Kunming 650000,China)

机构地区：[1]云南黄金矿业集团股份有限公司,昆明650000

出　　处：《矿冶》2020年第4期9-13,共5页Mining And Metallurgy

基　　金：“十三五”国家重点研发计划项目(2016YFC0801601)。

摘　　要：针对红牛铜矿陡倾斜矿体浅孔留矿法开采过程中损失贫化大的问题,采用ANSYS和FLAC3D联合建模计算。应力场、位移场和塑性区跟踪结果说明集中放矿前矿石散体对上下盘围岩具有支撑作用。但是,受围岩岩性弱和矿石集中放出后采空区暴露面积和暴露时间影响,采场稳定性不易控制,容易造成大范围片帮,致使损失贫化加剧。为此,通过设计锚杆对帮岩加固,优化爆破减少震动干扰和控制矿岩界限,控制与监测放矿降低损失贫化,实现矿石资源充分回收利用。Aiming at the prominent problem of ore loss and dilution during the mining process of Hongniu copper mine,a combined approach of the ANSYS and FLAC 3D,which were practical and efficient analysis software,was adopted.The results of stress field,displacement field and plastic zone indicate that ore bulk in the stope was beneficial to the stability of wall rock before large scale drawing.However,under the impact of poor rock mass or exposed area and time of goaf,the stability is not easy to control,which could cause a wide range of falling and aggravate the loss and dilution of ore.Therefore,a technical solution was designed for ensuring the utilization of mineral resources.It includes three parts,which are anchor bolt for reinforcing,blasting optimizing to reduce vibration interference and control rock boundaries,and monitoring of ore drawing to cut down the loss ratio and dilution ratio,respectively.

关 键 词：陡倾斜薄矿体 数值模拟 锚杆支护 爆破优化 放矿管理 

分 类 号：TD327[矿业工程—矿井建设]