Experimental study on lateral compaction characteristics of gangue filling body under limited roof conditions

Based on the principle of similar simulation, a set of simulation test board was designed by laterally pushing on the gangue-filled bulk,using the two deformation parameters of pushing angle and volume change rate, the influence of discharge step distance, pushing force, water content and loss content on the compaction characteristics of the filled gangue under the limited roof conditions was analyzed. The test results show that the increase of discharge step distance is not conducive to the consolidation of gangue; the increase of the lateral thrust contributes o the consolidation formation of the gangue. The inflection point of the slope of the large and volume change rate curve is slow; the water content has a significant effect on the consolidation characteristics of the gangue under laterally pushing. Under the lateral thrust of 5.0 kN and 7.5 kN ,when the water content reaches 3%, the gangue starts to consolidate. The amount of loss has the most significant effect on consolidation of granular gangue under lateral pushing. When the amount of loss is more than 4%, the effect on consolidation of granular gangue is relatively weakened.