预置矸石充填带置换窄煤柱无煤柱开采技术

Non-pillar mining technology of preset waste packing zone substitute for coal pillar of district sublevel was brought forward for the goal of coal mining without coal pillar. After driving the upper district sublevel haulage roadway, the packing zone was preset on the side of under district sublevel track roadway. When under district sublevel track roadway to be droved after the end of the upper coalface mining and adjoining rock stabilized, track roadway was droved along the preset packing zone tightly, and district sublevel coal pillar was no longer reserved. The coal pillar of district sublevel was replaced by packing zone, and non-pillar mining technology was realized. According to the geological conditions of Gaozhuang Coalmine’s No. 3top507 coalface, the mechanical model of preset waste packing zone gob-side entry driving was established, and the nonlinear numerical calculation analysis was applied to analyze the stability of packing zone. According to the required stability of packing zone, the field packing zone strength grade was CL20, and the field dimension of waste packing zone was determined, its width was 1600mm, its height was 4000mm, and there was 1100mm thickness top coal on its top and 100mm gap between its top and top coal. Engineering implement result verified the project’s rationality, and better economic and social benefit was achieved.