Because the large collapse pits appeared in the surface of stoped-out area in the lower iron belt of the southeast of Gongchangling iron mine, the sliding danger of side wall of collapse pit threats seriously the prod...Because the large collapse pits appeared in the surface of stoped-out area in the lower iron belt of the southeast of Gongchangling iron mine, the sliding danger of side wall of collapse pit threats seriously the production safety of open-pit of upper iron belt. The harm forms of collapse pit, especially the subsided harm of the bottom of granular media are analyzed. The experiment shows 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, a technical scheme of drawing the open-pit stripping rock along the collapse pit was proposed and the rock can be dumped along the collapse pit trend and wall safely.展开更多
文摘Because the large collapse pits appeared in the surface of stoped-out area in the lower iron belt of the southeast of Gongchangling iron mine, the sliding danger of side wall of collapse pit threats seriously the production safety of open-pit of upper iron belt. The harm forms of collapse pit, especially the subsided harm of the bottom of granular media are analyzed. The experiment shows 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, a technical scheme of drawing the open-pit stripping rock along the collapse pit was proposed and the rock can be dumped along the collapse pit trend and wall safely.
