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| Numerical simulation of roof control in Xiaochangchonghe ore section |
| Received:February 25, 2020 Revised:February 25, 2020 |
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| DOI： |
| KeyWord:roof;control numerical;simulation 3D-σ stability;dilution loss |
| Author | Institution |
| Zhang Mingtian |
Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,School of Land and Resources Engineering |
| Hou Kepeng |
Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,School of Land and Resources Engineering |
| Sunwei |
Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,School of Land and Resources Engineering |
| Wu Yahan |
School of Land and Resources Engineering |
| Niu Xiangdong |
Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,School of Land and Resources Engineering |
| Zhang Shengyou |
Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,School of Land and Resources Engineering |
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| Abstract: |
| In the process of underground mining of metal deposits, the roof control directly affects the ground pressure control of the stope. Aimed at the roof of xiaochangchonghe stope is not disposed, the limit exposure area of the goaf is small relatively，with the increase of the dip angle of the ore body, the roof caving boundary is also expanding, which leads to ore loss and dilution seriously in the mining process. Research suggests that direct roof bauxite shale is the main factor affecting ore body mining，3D-σ finite element software was used for numerical simulation analysis of the stope，three different roof control schemes are simulated and researched, including point retention column, anchor roof protection, and ore retention top layer，obtained stope stability under three different simulation scenarios，comprehensive simulation analysis results，finally, it is proposed to use a combination of retaining point pillars, anchoring roof protection, and retaining ore protection top layer for mining，this solution not only effectively controls the roof fall, but also can increase the distance greatly among the ore blocks between the points and pillars compared with the plan of supporting the roof with separate point pillars(span increased from 6 ~8m to about 14m)，Furthermore, the exposed area of the stope has been increased to achieve the purpose of reducing the ore loss and dilution. |
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