Empty Area Disaster Prevention And Safety Mining Technology Research In BaiZhangzi Gold Mine

After years of mining in Baizhangzi Gold Mine,mining mountain resources significantly reduced,mining grade gradually reduced,the mine decided to lean ore 100-9#orebody mining researches to complement the amount of ore under-resourced situation.100-9#ore body and surrounding rock belongs to a shaky and very shaky.The residual small goaf inside orebody increase the instability of the ore crushing,in addition,the 100-9#ore body was influenced by two interlinked and relatively large goaf from its hanging wall in a high stress state.In order to achieve security,economic and efficient recovery target,much-needed research to determine a reasonable Mining Project and Disaster prevention measures of empty area.In this paper,with field research,mechanical parameters measured,experiment analysis,theoretical analysis and Surpac design optimization,research 100-9#orebody safe efficient extraction and empty area of disaster prevention measures in Baizhangzi gold mine.By 102-11#and 102-11N#two goaf caving situation and nearby roadways pressure behavior of site investigation,survey and surface rock mass structure,ore point load strength measurement,and mine rock steady Classification,etc.,To identify ore and rock is unstable to very unstable,big mining ground pressure,ore and rock can take good.According to these factors,propose multi-section 100-9#orebody synergistically induced caving mining plan.By ore experiment indoor residual body footwall,it reveals when the next plate angle is 60 degrees,residues in the footwall is still large after caving mining.Finally,Come to conclusion 100-9#ore body should be set remnant ore mining projec for secondary recovery at the end of Ore.Besides,with a stable diagram method,Barton empirical formula Pakalnis critical span diagram,caving arch method four methods to calculate the ore body falling span,analysis the advantages and disadvantages of these four methods were compared,and obtain maximum falling distance of the ore body.By calculating and analyzing the impact of falling blast intensity,purpose ore control method by staying 3m safety cushion in the mine mouth to prevent empty area falling impact hazards.Accordingly proposed a multi-section 100-9#orebody synergistically induced caving mining put through indoor residual footwall ore body experimental analysis revealed after Caving next plate angle footwall remaining amount is still large,come to 100-9#orebody falling ore mine after the end of the discharge;program Ore mining residues need to set up a secondary recovery project carried conclusion.In addition,the use of stable diagram method,Barton empirical formula,Pakalnis critical span diagram,caving arch method four methods,analysis and calculation of ore falling span,and the advantages and disadvantages of these four methods were compared,too the maximum falling distance of the ore body,thus proposes to use flat bottom trench project induced falling,then collaborative project control orebody segment induce smooth falling of mining processes.Calculated by analyzing the impact of falling blast intensity to stay and ore control methods 3m safety cushion in the mine mouth,to prevent empty area falling impact hazards.According to it,propose project with the bottom of the trench flat-induced falling,then collaborative project control orebody segment induce smooth falling of winning technology.Analysis showed that the proposed multi-segment synergistically to induce caving mining plan and a mine way to leave 3m safety cushion in the mine mouth,can be effectively utilized to take good condition,to avoid the impact of disasters falling out area.And allows potential hazards 100-9#ore residue gob conditions that did not happen,thereby allowing 100-9#orebody get safe and efficient mining...