Research and field application of enlarging and shaping technology for coal mine backfilling feeding holes

Abstract:

The filling material feeding hole in coal mines is a crucial passage for re-transporting the solid waste such as coal gangue produced during underground coal mining back to the underground mined-out areas for filling. Due to its high usage frequency and large transportation volume， the filling materials impact， erode and wear the hole walls during transportation， causing deformation or even damage to the feeding holes， which seriously affects their working efficiency. In response to this situation， it is necessary to handle the feeding holes. Taking the repair and treatment of the filling material feeding holes in Beixulou Coal Mine as an example， this paper expands and shapes the original feeding holes， inserts casing pipes， and solidifies the cement to form new feeding holes， achieving the goal of quickly handling the deformed and damaged feeding holes， reducing the workload， shortening the downtime of the feeding holes， and ensuring the normal production of coal mining enterprises.