CAJ | 학술논문

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。
삼산도금광이보채장상반위암게로후출현박리화도사현상,조성광석적빈화병엄중영향채장적안전。채용당량폭로면적법화삼유유한원법대불동삼수적이보채장상반위암적은정성진행분석,통과계산화분석불동삼수적채장상반위암적당량폭로면적화게로후적위이량、응력변화,결합겁한윤허폭로면적판거、강도이론판거화용허겁한위이량판거득출불동삼수적채장상반위암은정정황,병통과공업시험제출채장적합리삼수화상반위암적공제조시。시험표명,채장관위10 m,고위10 m시,채장상반위암게로후초기은정성교호,3 d후국부발생박리화도사현상,불은정구역주요집중재중부편상화고근채장정판위치,차채용묘색화금속망연합지호방식공제채장상반위암효과교호,유효보증료채장적안전병공제료광석적빈화솔。
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.