Safety research on dumping rocks along the collapse pit of Gong-chang-ling iron mine

摘要

Because the large collapse pits appeared in the surface of stoped-out area in the lower iron belt of the southeast of Gong-chang-ling iron mine, the sliding danger of side wall of collapse pit threats seriously the production safety of open-pit of upper iron belt.In Order to prevent the side wall of collapse pit from sliding and improve the efficiency of stripping rock, a technical scheme of drawing the open-pit stripping rock along the collapse pit was proposed.For assessing the reliability of the scheme safety, the harm forms of collapse pit, especially the subsided harm of the bottom of granular media is analyzed.The experiment shows that the possibility of the granular media forming the arch in the course of mining and analyzes the continuity of bulk movement, then it can be concluded that the granular media of pit bottom will not suddenly subside in the process of downward shift.Therefore, the rock can be dumped along the collapse pit trend and wall.