| How to mine coal resources under buildings has become the important research content in the field of coal mining in China. As a green mining technology, backfill mining can fully and efficiently mine coal resources under buildings, increase coal recovery ratio and control the surface subsidence.Based on the basic properties of superhigh-water material and with the means of theoretical about backfill mining analysis, numerical simulations and field observation for the application in GC1301 working face of Yineng mining, preliminary analysis of rules and control mechanism of surrounding rock movement of backfill mining with super-high-water material is made The conclusions are as follows:(1) On the basis of characteristics of backfill mining with superhigh-water material, summarizing filling mining method suitable for medium-thickness seam as well as the advantages and disadvantages and applicable condition.(2) Summed up the god filling mining strata control related theory mainly include filling dynamics, key strata theory and, theory of equivalent mining height and broken and void volume conservation theory, and from three aspects, this paper expounds that filling body of superhigh-water material controls strata deformation mechanism.(3) Detailed analysis on strata control mechanism of package filling mining with superhigh-water material in medium-thickness seam and obtained its activity rule of surrounding rock.(4) With the numerical simulation about surrounding rock movement rule, it is concluded that filling body can timely and effectively control the surrounding rock activity. As the improvement of filling rate, the effect of controlling the surrounding rock is better.(5) Through analysis on engineering application of backfill mining with superhigh-water material in medium-thickness Seam, the technology not only can be able to better control the surrounding rock of gob, also has remarkable economic benefits and long-term social benefits. |
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