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| Stability analysis of high and steep slope in an open-pit mine under the condition of transferring from underground into open pit mining |
| Received:November 13, 2018 Revised:December 05, 2018 |
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| KeyWord:transferring from underground into open pit mining; high and steep slope; Dimine-Midas/GTS NX; failure law |
| Author | Institution |
| YANG Zhaoyun |
南华大学资源环境与安全工程学院 |
| LI Guangyue |
南华大学资源环境与安全工程学院 |
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| Abstract: |
| An open pit mine is turned underground to open-pit mining. Under the comprehensive influence of complex engineering geological conditions and historical goaf, the open-pit slope is prone to collapse, step instability and other disasters, which seriously threatens the safety production of open-pit mine. In order to study the deformation and failure law of high and steep slope rock mass in an open-pit mine, a three-dimensional engineering geological model of large open-pit mine was established by using Dimine-Midas/GTS NX coupling method and its stability was calculated and analyzed. The results show that the roof deformation of underground mined-out area is small and has little effect on the slope of open pit mine; the slope displacement in south area of strong weathered rock is large, and the slope has the tendency of "sliding" outward; when excavated to -180m platform, the slope safety factor drops to the critical value, and the plastic zone begins to penetrate the foot of slope. It is concluded that the critical level of mining is -180m platform. Through the analysis of the failure mechanism of the slope, the main factors of the slope deformation and failure are revealed, and the theoretical guidance for the subsequent slope treatment is provided. |
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