FACTORS OF FILL MASS STABILITY IN THE JINCHUAN NO.2 MINE

With high selectivity and low dilution, Cut- and -fill stoping plays an irreplaceable role in deposit mining projects, especially in which occurrence conditions of orebody are complicated, surface environmental protection needed and rockburst easily triggered. Cut- and -fill mining practices of past decades demonstrated that the main factors affecting fill mass stability include engineering geological condition, back-fill strength, stoping technology and surrounding-rock boundary condition and so on. The back-fill strength is the key factor for success or failure of the backfilling project. And the dimension of orebody-stoping drift is the critical factor affecting fill mass supporting layer stability. The irregular boundaries between fill mass and surrounding rock can transfer part of the former self-gravity into the latter, reduce the load on the supporting layers, and then advance the stability of the fill mass.