夏甸金矿采矿方法过渡期临时矿柱尺寸确定方法研究

本文针对夏甸金矿由充填法回采转为崩落法回采过渡期确定临时矿柱尺寸的需要，应用FLAC^3D对崩落法回采过程中采空区顶板的破坏形式进行了分析，计算结果表明，崩落法采空区顶板塑性破坏区呈拱形发展，且在拱型破坏区之外的上部边界，位移量衰减很快，据此按拱型冒落边界设计了临时矿柱的尺寸，实现了两种采矿方法的产量平稳过渡与临时矿柱的良好回采条件。生产过程中的现场监测表明，实际冒落区与数值计算的拱形破坏区相符，因此表明，以塑性破坏区为标志的采空区冒落范围的数值分析方法，用于确定保安矿柱尺寸是可行的。

THE INTERIM PILLAR SIZE DESIGN METHOD STUDY OF MINING METHOD TRANSITION IN XIADIAN GOLD MINE

The boundary of caving method should be concerned when the mining method in Xiadian good mine transits from filling to caving method, because in the period of transition the filling stope and caving stope should worked at the same time and the falling of mined-out section roof will affect the filling stope, Based on the investigation in site, the first sublevel caving boundary in Xiadian gold mine is studied in this paper, To simulate this situation, a numerical analysis method, FLAC3D is applied. The FLAC3D results show the mined-out section roof have falling after the first sublevel caved, but the plastic zone are formed as vaulted and the displacements attenuation quickly in the boundary of break zone. Scene observation show the falling range not beyond the pillar, and the form of mined-out section falling obeyed the vaulted theory. So designed the boundary of sublevel caving method by the vaulted theory is doable. These results suggest that FLAC3D can be applied to model the mining behavior of complicated discontinuous rock masses.