深井分段充填采矿应力演化规律数值分析  

Numerical analysis of stress evolution law in deep well sublevel filling mining

作　　者：郭力达 余斌 李宗楠 GUO Lida;YU Bin;LI Zongnan(Beijing General Research Institute of Mining&Metallurgy,Beijing 100160,China;BGRIMM Technology Group,Beijing 100160,China;National Center for International Joint Research on Green Metal Mining,Beijing 102628,China)

机构地区：[1]北京矿冶研究总院,北京100160 [2]矿冶科技集团有限公司,北京100160 [3]国家金属矿绿色开采国际联合研究中心,北京102628

出　　处：《有色金属（矿山部分）》2024年第1期23-32,39,共11页NONFERROUS METALS(Mining Section）

基　　金：国家重点研发计划项目(2021YFC2902102)。

摘　　要：针对某矿山—700 m至—1100 m中段水平的典型采场布置方式,建立了数值分析模型,模型中段高度60 m,分段高度12 m。通过岩石力学试验,测试了矿岩、充填体力学参数,构建了1个原岩应力场状态和8个开挖与充填工作状态,并进行了逐次回采开挖与充填过程的数值模拟。数值计算与分析结果表明,伴随着相邻中段的回采,矿体厚度逐渐变薄,中段水平矿柱中应力集中现象较为明显,且以水平应力集中为主导,水平应力最大集中系数达到2.7。竖直方向应力变化特征差异性较大,其中,在前3次序开挖过程中,上盘存在压应力卸载现象,下盘存在压应力集中的现象。等效应力计算结果表明,随着矿体变薄,应力集中系数逐渐增大,应力集中效应由下盘逐渐向矿体中部转移,最大应力集中系数为2.79,发生于矿体中部位置。充填前后的应力场结果分析表明,充填过程对改善应力场集中效应有明显作用,且随矿体变薄,充填体在降低应力集中方面的作用越明显,模型中降低水平应力集中系数可达0.63。A numerical analysis model is established for a typical stope layout in a mine with a middle level of-700 m to-1100 m,with a middle height of 60 m and a sectional height of 12 m.Through rock mechanics experiments,the mechanical parameters of ore,rock,and filling are tested,a stress field state of the original rock and eight working states of excavation and filling are constructed,and the numerical simulation of excavation and filling processes in successive mining is carried out.The results of numerical calculation and analysis show that with the mining of the adjacent middle section,the thickness of the ore body gradually becomes thinner,and the phenomenon of stress concentration in the horizontal pillar in the middle section is obvious,and the horizontal stress concentration is dominant,and the maximum concentration coefficient of horizontal stress reaches 2.7.The characteristics of vertical stress change are quite different.Among them,during the first three excavation sequences,there is a phenomenon of compressive stress unloading in the upper wall and a phenomenon of compressive stress concentration in the lower wall.The results of equivalent stress calculation show that with the thinning of the ore body,the stress concentration coefficient gradually increases,and the stress concentration effect gradually shifts from the footwall to the middle of the ore body,and the maximum stress concentration coefficient is 2.79,which occurs in the middle of the ore body.The analysis of stress field results before and after filling shows that the filling process plays an obvious role in improving the stress field concentration effect,and with the thinning of the ore body,the filling body plays a more obvious role in reducing stress concentration,and the horizontal stress concentration coefficient can be reduced to 0.63 in the model.

关 键 词：卸压开采 水平矿柱 应力集中 数值模拟 地压控制 

分 类 号：TD853.34[矿业工程—金属矿开采]