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Abstract The research is the first case that assessing the long-term effect of ultra high-water material backfilling method. It is based on an engineering case of the open backfilling method using ultra high-water material on working face No.6 at Taoyi coal mine. The microseismic monitoring and the stress dynamic monitoring of surrounding rock are used，in combination of the surface subsidence monitoring result，to evaluate the effect of large areal gob controlled by this certain backfilling method. According to the monitoring data，with the condition of mining height of 3 m，about mining depth 300 m，inclined length of 120 m on the working face No.6 at Taoyi coal mine，the maximum height of the overburden rock fractured zone is 48 m；the influence extent of the front abutment pressure is 35–40 m；and the maximum surface subsidence upon the working face is 98 mm. The results show that the open backfilling method with ultra high-water material controls the fractured zone of surrounding rock effectively and provides a remarkable reduction of the influence of mining activities. The backfilling method has a notable effect especially on the overhand mining working face.
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Received: 21 May 2013
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2014, Vol. 33 
