Abstract:

Abstract：According to the mining requirement in 1612 secondary coalface and preserve the headentry for a long time after mining in Jingxing mining，the integrative technology of super high water material open backfill mining and gob-side entry retained in secondary mining block was applied.Blocking pulp board and flame retardant waterproof membrane structuce was used to improved the goaf filling rate，the “strong-medium-weak” supporting structure was designed and adopted to transfer gateway surrounding rock stress to goaf deep，reducing gateway surrounding rock stress.Practise showed that the integrative technology of super high water material open backfill mining and gob-side entry retained has the advantages of a simple structure，low cost of filling and the effect is ideal，has a good promotion and application value.

Key words: secondary mining block, super high water material, open backfill mining, gob-side entry retained