主溜井冲击损伤机制分析及实测验证

为准确判断溜井受矿石冲击的损伤情况，基于影响溜井的损伤因素，构建了溜井受矿石冲击的损伤理论模型，并据此运用MATLAB计算获得矿石对溜井冲击的冲量分布。采用MADIS-FLAC3D数据耦合技术建立溜井冲击损伤数值模型，揭示了溜井冲击损伤的分布规律。综合运用空区激光探测系统（CMS）和大型矿床三维软件SURPAC，实现了对溜井垮塌三维信息的准确获取及可视化，并对所建立模型的计算分析结果进行了验证。结果表明：（1）根据溜井冲击损伤模型计算得到溜井受冲击的范围标高为-265.83～-292.28 m，冲量在此区间呈现先增大后减小的规律，在标高为-272.88 m处达到最大，为13.52 kN?S；（2）通过数值模型分析得到溜井受矿石冲击一侧在标高为-264.12～-294.88 m区间段发生了位移变化，并在相应区间段形成一定范围的塑性区，说明矿石冲击破坏了此处溜井围岩的稳定性；（3）数值分析得出的最大位移监测值出现的位置与探测模型垮塌区域的最大断面标高一致，实际探测获得的溜井垮塌最严重区域形态与数值模拟确定的塑性区相吻合。

Mechanism of impact-induced damage of main chute and its experimental validation

To accurately estimate the damage of chute under ore impact, a theoretical model is developed for describing the damage of the chute considering the influential factors of chute damage. The impulse distributions induced by ore impact on chute are obtained with MATLAB. Based on the MADIS-FLAC3D data coupling technique, a numerical model of chute is developed and used to analyze the distribution of chute damage. Combining the capacity monitoring system (CMS) and the 3D software SURPAC, the 3D information relating to chute collapse has been effectively determined and visualized, and the proposed procedure is validated. It is shown that (1) the range of impact calculated with the proposed model is at the elevations from -265.83 m to -292.28 m; and in this zone, the impact momentum increases firstly, then decreases, and reaches its peak value 13.52×103 N?S at the elevation -272.88 m; (2) the displacement occurs in the zone from the elevations -264.12 m to -294.88 m under the ore impact, where a plastic zone is formed, indicating that the stability of surrounding rock in this section has been degraded; (3) the location of the maximum measured displacement is close to the position of the maximum cross-section of collapse area from the monitored results. The shape of the most serious collapse area of chute from monitoring agrees with the plastic zone determined by the numerical analysis.