• 论文 •

### 采场空区拱架效应与矿柱宽度及间距相依性分析

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

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.