Research on strength characteristics and application of foam filling composite bearing structure for deep coal mine
The rockburst disasters caused by complex environment of deep coal mining and the instantaneous release of ultra-high energy accumulated from mining disturbances is increasingly severe.In order to solve the phenomenon of overlying strata movement and high energy instantaneous release impact in the process of coal mining,laboratory experiments,numerical simulation and field practice were combined to study the bearing characteristics of coal bearing area,collaborative bearing area and foam filling bearing area of roof fracture in the process of deep coal mining.Through uniaxial compression and acoustic emission test system,the composite bearing structure and failure characteristics of foam filling body were studied,and the strength change and crack propagation law of foam filling body were revealed;the relationship between deformation and energy dissipation characteristics was explored,the greater the stress,the greater the energy dissipation and the greater the strain.The strain energy density distribution of foam filling method and direct caving method was studied by numerical simulation.The results showed that the strain energy density distribution in foam filling mining was not concentrated,and the peak value was lower than that of direct caving method,and the foam filling could effectively reduce the release of fracture energy of overlying roof.Taking 45205 fully mechanized mining face in Sandaogou Coal Mine as an example,the control measures for compaction and energy absorption of foam material filling body were proposed to reduce the instantaneous release of high energy in overlying strata during mining.The monitoring results of surface subsidence and micro-seismic energy in the 45205 fully mechanized mining face showed that when the filling rate of the filling body was controlled at 80％,the total number and released energy of micro-seismic events in the working face were significantly reduced compared with the direct collapse method.The research showed that foam filling body could effectively reduce the energy release of mining rock,achieving rock burst management and sustainable mining of deep coal mines.
deep coal minerock burstfoam filling bodycomposite bearing structurefailure characteristics
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