鸡笼山金矿过采区高应力下采场稳定性分析研究
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摘要
鸡笼山金矿尚有大量"过采区"和"高应力"状态下的低品位矿体未进行开采,为了提高矿山资源利用率,延长矿山服务年限,对这些矿体进行了采矿方法研究与现场试验。结合鸡笼山金矿的矿岩物理力学性质,建立了鸡笼山金矿区的三维模型,运用有限差分元分析软件FLAC~(3D)进行数值分析计算,模拟了试验采场原始地应力分布状况,并分别就矩形开采断面、椭圆形开采断面、蝶拱形开采断面对采场稳定性的影响进行了模拟分析。分析结果表明:在矿体回采过程中,无论采用何种水平回采断面,在矿体上下盘及间柱均会出现应力增加,但相对来说蝶拱形断面开采应力增加幅度以及分布区域更低,有利于采场的稳定。研究结果为现场的安全生产提供了理论依据。
There are still a large number of ore bodies under the condition of empty area around high stress and low grade in Jilongshan gold mine have not been mined.In order to improve the utilization rate of mine resources and prolong the service life of the mine,the mining method and field test of these orebodies are carried out.Based on the physical properties of ore,the three-dimensional model of Jilongshan gold mine is established.By using finite difference element analysis software FLAC~(3D),the distribution of original ground stress in test stope is simulated.The influence of the rectangular mining section,the elliptical mining section and the butterfly arch mining face on the stability of the stope are simulated and analyzed.The analysis results show that during the mining of ore body,no matter which horizontal mining section is adopted,there will be more stress on hanging and foot wall of the orebody and the pillar;the increment of stress and the distribution area of butterfly arch section are lower,which is beneficial to stope stability.The research results provide theoretical basis for the safety production in the field.
There are still a large number of ore bodies under the condition of empty area around high stress and low grade in Jilongshan gold mine have not been mined.In order to improve the utilization rate of mine resources and prolong the service life of the mine,the mining method and field test of these orebodies are carried out.Based on the physical properties of ore,the three-dimensional model of Jilongshan gold mine is established.By using finite difference element analysis software FLAC~(3D),the distribution of original ground stress in test stope is simulated.The influence of the rectangular mining section,the elliptical mining section and the butterfly arch mining face on the stability of the stope are simulated and analyzed.The analysis results show that during the mining of ore body,no matter which horizontal mining section is adopted,there will be more stress on hanging and foot wall of the orebody and the pillar;the increment of stress and the distribution area of butterfly arch section are lower,which is beneficial to stope stability.The research results provide theoretical basis for the safety production in the field.
引文
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[3]张耀平,曹平,袁海平,等.复杂采空区稳定性数值模拟分析[J].采矿与安全工程学报,2010,27(2):233-238.ZHANG Yaoping,CAO Ping,YUAN Haiping,et al.Numerical simulation on stability of complicated goaf[J].Journal of Mining and Safety Engineering,2010,27(2):233-238.
[4]文兴.非连续复杂群采空区稳定性分析与治理方案研究[D].长沙:中南大学,2012.
[5]刘培慧.基于应力边界法厚大矿体采场结构参数数值模拟优化研究[D].长沙:中南大学,2009.
[6]张敏思.基于经验方法和数值模拟的采场围岩稳定性研究[D].沈阳:东北大学,2015.
[7]于跟波,杨鹏,陈赞成.缓倾斜薄矿体矿柱回采采场围岩稳定性研究[J].煤炭学报,2013,38(S2):294-298.YU Genbo,YANG Peng,CHEN Zancheng.Study on surrounding rock stability of pillar extraction in thin gently inclined ore body[J].Journal of China Coal Society,2013,38(S2):294-298.