Study On Mechanism Of Overlying Strata Controlling For Superhigh-water Material Backfill Mining And Its Application

Based on key common issues about mining under building, water conservation mining and face passing through abandoned roadway-overlying strata control problems as the starting point, safe, efficient, high recovery rate of exploitation of coal resources as the aim, filled with superhigh-water packing materials as the mean, comprehensive use related theories e.g. mining science, fluid mechanics, rock mechanics and mining subsidence, through theoretical analysis, laboratory research, computer numerical simulation and field trials, mechanism of overlying strata controlling for superhigh-water material backfill mining in different needs was researched and explored,"queuing phenomenon" and "catch-up phenomenon" existing in the actibities of several groups of soft rocks in overlying strata was pointed out, the key to the success of backfill mining technology is to control the basic layer of the key stratum was revealed, the case that backfill mining can weakened activity level of the overburden rock significantly was discovered, this article puts forward that backfill mining conditions the multiple faces should be preferred jump mining in the condition of backfill mining was put forward, the mechanism of water conservation mining in different conditions were analyzed, the mechanism about overlying strata control of superhigh-water packing material filling the abandoned roadway was studied, and the Conclusions guided the engineering practice effectively.