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Aiming at the strata movement and control problems caused by coal seam backfill mining, the control mechanism of “backfill + pillar + bearing strata” cooperative support system was proposed based on rock mechanics, surrounding rock control mechanism and related theories. The stability condition of “backfill + pillar+ bearing strata” cooperative support system was then obtained. Considering factors such as the weight of the overlying strata, waste backfill size, goaf size and so on, the concept of equivalent mining height was put forward. The compression value and the formula for analyzing equivalent mining heights for different waste backfill compactness were derived. Finally, along with practical work, theoretical calculations and numerical simulation are used to analyze overlying strata movement law of different waste backfill replacement in the corresponding pillar. The results show that the roof subsidence value and the equivalent mining height caused by secondary strata movement increased with the decrease of compactness degree of waste backfill. When the void ratio is approximately 0.55, the increment rate of equivalent mining height becomes more sensitive.

Cooperative control mechanism and control effect analysis of coal seam backfill mining