FLAC3D数值模拟露天转地下边坡及采场稳定性研究

以云南晋宁周边典型的缓倾斜薄至中厚磷矿床为研究对象,基于Auto CAD-ANSYS-FLAC^3D等软件进行耦合建模,分别建立200 m和300 m不同开采深度的单一地下开采模型和在露天终了边坡为45°倾角时露天转地下开采模型,并展开了数值模拟试验。研究表明:当边坡高度为200 m时,整个露天转地下开采过程中边坡岩体及采场覆岩整体稳定;边坡高度为300 m时,边坡侧塑性区出现贯通,边坡岩体将发生弯曲下沉破坏。综合经济和安全性考虑,建议控制露天边坡高度在200 m以内。相关研究结果可对磷矿山地下开采工程提供一定的技术参考价值。

FLAC3D numerical simulation of open-pit transformation to underground slope and stope stability

This paper takes the typical gently inclined thin to medium thick phosphorus deposits around Jinning, Yunnan as the research object, and conducts coupling modeling based on software such as AutoCAD-ANSYS-FLAC3D, and establishes a single underground mining model with different mining depths of 200m and 300m and open-pit mining. Finally, when the slope is 45°, the open-pit mining model is converted to underground mining, and a numerical simulation test is carried out. The research results show that when the height of the slope is 200m, the slope rock mass and the overlying rock of the stope are overall stable during the entire process of converting from open pit to underground mining; when the slope height is 300m, the plastic zone on the side of the slope is connected, and the slope rock mass Bending and sinking damage will occur. Therefore, in consideration of comprehensive economy and safety, it is recommended to control the open-air slope height within 200m. Relevant research results can provide a certain technical reference value for underground mining projects in phosphate mines.