Stability control of rock surrounding roadways is one of the most challenging problems in underground coal mining, especially for water-enriched roadways. Solid backfill mining (SBM) can effectively reduce the movement of overlying strata. In this paper, the characteristics and influencing factors of deformation of roadways affected by underlying mining (RAUM) in SBM are investigated via theoretical analysis, numerical simulation and field measurements. Based on the testing of compaction properties of backfill material, the optimum ratio of waste rock and fly ash (1:0·3) was adopted and the backfill body compression ratio was designed at 15% to guarantee the stability of RAUM. Field measurements at a test site (Xingtai coal mine in Hebei province, China) strongly indicate that the application of the proposed parameters for SBM can effectively control the deformation of RAUM and improve the safety of roadways.
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