Experimental study on slurry flow characteristics of goaf filling area with floor drag pipe between supports
In order to solve the problem of spatiotemporal interference between mine filling and coal mining,and realize safe and efficient filling and mining,combining with the production system and mining conditions of Lijiahao Mine,the non-cemented paste goaf filling technology with floor drag pipe between supports was developed.In order to ensure the feasibility of the technology and provide reliable filling parameters,a physical model was established,and non-cemented paste filling materials were prepared using gangue and fly ash as aggregates,and the interaction between maximum particle size and mass concentration on the flow characteristics of slurry goaf was analyzed.The results show that:The filling amount of slurry is mainly affected by the particle size of gangue,and the mass concentration mainly affects the diffusion rate of slurry in the goaf;With the increase of slurry filling,the voids in the goaf gradually tend to be saturated,and the permeation mode shows a hemispherical diffusion distribution with the nozzle as the spherical center;The mechanism of slurry flow diffusion and obstruction in the goaf area is revealed by the simulation test;The sections are cut sequentially along the pipeline trend,and the gangue gradation and mass concentration in the slurry have obvious separability.
floor drag pipe between supportsnon-cemented paste filling materialsflow characteristicsmatching parameters
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