Study on space-time evolution law of strata behaviors under compacted filling
LI Xinwang1，2，ZHAO Xinyuan1，CHENG Lichao1，2，QIN Yiling1#br#
(1. School of Mining and Geomatics Engineering，Hebei University of Engineering，Handan，Hebei 056038，China；
2. Coal Resources Development and Construction Application Technology Research Center of Universities in Hebei Province，Hebei University of Engineering，Handan，Hebei 056038，China)
Abstract：A mechanical model of space-time evolution of strata behaviors in compact filling is established and analyzed. Similar material simulation method is used to study the space-time evolution law of strata behaviors in stope under filling mining conditions，and the filling practice of a mine in Xingtai is illustrated as an engineering example. The results show that，during the active period of roof subsidence，the force acting at the filling body is positively correlated with the filling step and the advancing time. In the physical simulation of backfill mining，the stress of roof measuring points generally experiences a process of stress rising，rapid pressure relief，slow pressure rise and stabilization，and the peak stress of the roof in front of the working face and the force of the coal pillar increase with increasing the filling step. During advancing of the working face，the force of filling body increases continually and finally tends to be stable，and the roof stress and the force of the filling body after stabilization are less than the original rock stress. In the static stage after stopping mining，the roof of the filling area still subsides slowly with time. The measured results of the mine show that the pressures of the filling 15 and 40 m from the cut-hole are respectively 3.5 and 5.5 MPa and that the roof subsidence and overburden separation show regular changes with increasing the filling distance and the advance of the filling time.
李新旺1，2，赵新元1，程立朝1，2，秦义岭1 . 密实充填矿压显现时空演化规律研究[J]. 岩石力学与工程学报, 2020, 39(2): 341-348.
LI Xinwang1，2，ZHAO Xinyuan1，CHENG Lichao1，2，QIN Yiling1. Study on space-time evolution law of strata behaviors under compacted filling. , 2020, 39(2): 341-348.
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2020, Vol. 39 
