摘要
三山岛金矿二步采场上盘围岩揭露后出现剥离和掉碴现象,造成矿石的贫化并严重影响采场的安全。采用当量暴露面积法和三维有限元法对不同参数的二步采场上盘围岩的稳定性进行分析,通过计算和分析不同参数的采场上盘围岩的当量暴露面积和揭露后的位移量、应力变化,结合极限允许暴露面积判据、强度理论判据和容许极限位移量判据得出不同参数的采场上盘围岩稳定情况,并通过工业试验提出采场的合理参数和上盘围岩的控制措施。试验表明,采场宽为10 m,高为10 m时,采场上盘围岩揭露后初期稳定性较好,3 d后局部发生剥离和掉碴现象,不稳定区域主要集中在中部偏上和靠近采场顶板位置,且采用锚索和金属网联合支护方式控制采场上盘围岩效果较好,有效保证了采场的安全并控制了矿石的贫化率。
Ore dilution and stope safety were seriously affected by the phenomenon of stripping and rockfall occurred in the hanging wall rock of second-step stope in Sanshandao Gold Mine. Equivalent exposed area method and 3D-FEM were com-bined to analyze the stability of the hanging wall rock of second-step stope with different structure parameters. Equivalent ex-posed area,displacement and stress variation were calculated when the hanging wall rock was exposed with different parameters of the stope,stable situation was reflected based on the Maximum Permissible Exposure Area Criterion,Strength Theory Criteri-on and Maximum Permissible Displacement Criterion. The reasonable parameters of the stope and control measures of the hang-ing wall rock were suggested to apply according to the industrial test with the theoretical results. The test showed that the phe-nomenon of stripping and rockfall was occurred when the hanging wall rock was exposed after three days,though which was sta-ble during the early days. The unstable areas were distributed at the mid-height of the hanging wall rock,and the location near stope roof. The combination support pattern of cable and wire mesh was adopted to control the deformation of the hanging wall rock,the supporting effect was good and stope safety and ore dilution were effectively guaranteed according to the industrial test.
出处
《金属矿山》
CAS
北大核心
2015年第11期143-148,共6页
Metal Mine
基金
华北理工大学青年基金项目(编号:Z201407)
关键词
二步采场
上盘围岩
当量暴露面积
有限元计算
工程应用
Second-step stope
Hanging wall rock
Equivalent exposed area
FEM simulation
Engineering application
