中山大学学报自然科学版 ›› 2018, Vol. 57 ›› Issue (6): 1-7.doi: 10.13471/j.cnki.acta.snus.2018.06.001

• 论文 •    下一篇

采场空区拱架效应与矿柱宽度及间距相依性分析

姜立春1,2,王玉丹2,温勇3   

  1. 1.华南理工大学土木与交通学院,广东 广州 510640;
    2.华南理工大学安全科学与工程研究所,广东 广州 510640;
    3.中山大学地球科学与工程学院,广东 广州 510275
  • 收稿日期:2017-10-09 出版日期:2018-11-25 发布日期:2018-11-25

The analysis of dependence of goaf arching effect on pillar width and spacing

JIANG Lichun1, 2,WANG Yudan2,WEN Yong3   

  1. JIANG Lichun1, 2,WANG Yudan2,WEN Yong3
  • Received:2017-10-09 Online:2018-11-25 Published:2018-11-25

摘要:

为了充分利用岩体拱架效应提高矿山釆空区的稳定性,基于采空区岩拱拱轴内力及结构承载力的特征,构建空区岩拱的力学模型,采用无铰拱理论计算岩拱内力大小,推导出矿柱间距及宽度关于拱轴系数 m 及拱高 h 的数学表达式。分析了某大型金矿不同拱轴系数情况下,矿柱宽度及矿柱间距依存关系。结果表明:当矿柱宽度一定时,矿柱间距( l )随着拱轴系数( m )的减小而减小,当拱轴系数减小至零时,拱轴线趋近直线,岩拱效应逐渐消失;当矿柱间距一定时,矿柱宽度( d )随着拱轴系数( )的增加而增大,变化曲率逐渐减小。工程验证表明,矿柱合理间距取28 m时,采场顶板安全状态良好,现场位移监测验证了其结果的可靠性,说明了空区顶板岩体拱架效应约束作用明显。

关键词: 拱架效应, 无铰拱, 拱轴系数, 矿柱间距, 金属矿山

Abstract:

In order to make full use of the rock mass arch effect to enhance the stability of the mine goaf and improve the mining rate, a mechanical model of the goaf arch was developed based on the analysis of goaf arch internal force and the structure bearing capacity. Internal force of rock arch was calculated by using the hingeless arch theory and the mathematical expression about pillar spacing and width with regard to arch axis coefficient(m)and arch rise(h)was put forward. A case study of a large goldmine was performed and the connection between pillar spacing and width with different arch axis coefficients was demonstrated. The results show that when the pillar width was fixed, the pillar spacing(l)would decrease as the arch axis coefficient decreased. The arch axial line would approach straight line nearly when the arch axis coefficient decreased to zero, and the rock arch effect would vanish gradually. On the other hand, when the pillar spacing was fixed, the pillar width(d)would increase as arch axis coefficient(m)increased and change curvature would decrease gradually. According to the mineral exploration engineering result, the reasonable pillar spacing was appropriate to be designed as 28 m at the situation when the arch axis coefficient(m)was 2, the arch rise(h)was 5 m and the pillar width(d)was 10 m. The safety status of mine roof was thus in good condition and the maximum displacement deformation of the 150d roof was less than 4 mm. Moreover, the collapse phenomenon would not occur. The present study shows that the constraint effect of the goaf roof arch is significant.
 

Key words: arching effect, hingeless arch, arch axis coefficient, pillar spacing, metal mine

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