Experimental research on disintegration characteristics of subsidence paste backfill body of Tong-keng mine
SUN Wei1，WU Aixiang2，WANG Hongjiang2，HOU Kepeng1，YANG Yi1，LIU Lei1
(1. Faculty of Land Resources Engineering，Kunming University of Science and Technology，Kunming，Yunnan 650093，China；2. School of Civil and Environmental Engineering，University of Science and Technology Beijing，Beijing 100083，China)
Abstract：Using a backfill body disintegration rate tester along with SEM and CT analysis techniques，this paper examines the influence of waste rock incorporation proportion and cement introduction quantity upon the disintegration properties of the treated mass. The disintegration mechanism of the mass is also discussed. The results suggest：at given cement introduction quantity，the backfill body disintegration rate diminishes and its disintegration time shortens with an increasing refuse incorporation proportion. Also at a given waste rock incorporation proportion，the backfill body disintegration rate drops dramatically when the cement introduction quantity is increased. The disintegration process is subdivided into three phases including water absorption disintegration，steady disintegration，and disintegration termination. The treated mass derives it adhesion from the strength of the cement hydration products. The seepage flow is established inside the mass under the seepage pressure and is also the result of the randomly distributed open channels and the constant expansion of closed channels. Channel expansion is driven by attraction of the matrix，and when the backfill body absorbs water the gas-liquid phase transfers incessantly a force to the solid phase：the mass proceeds with disintegration if the force value is greater than the cementation adhesion，the mass does not disintegrate when the force value is less than the adhesion.
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2017, Vol. 36 
