Effects of Aeolian Sand and Water−Cement Ratio on Performance of a Novel Mine Backfill Material

The gob-side entry retaining (GER) technique, as the family member of pillarless coal mining system, is becoming popular, mainly attributed to its high resource recovery rate and significant environmental benefits. Seeking cost-effective backfill material develop roadside backfilling body (RBB) generally a hot topic for operators scholars. Except relatively cost, other shortcoming widely used high-water also obvious when in arid, semi-arid deserts or Gobi areas lacking water. modified (MBM) mixed with aeolian sand was recently developed an alternative conventional materials. Some critical parameters affecting both physical mechanical properties MBM, including amount water-to-powder ratio water-content material, have been experimentally investigated present research. Test results showed that MBM featured early strength bearing capability after large post-peak deformation. In particular, adjustable setting time through changing widens application practice. Unlike typical elastoplastic material; stress-strain curves consist pore compression, elastic deformation, yielding, total failure. Note peak residual increased doping increased, which probably because impacted uniform reticular structure ettringite MBM. Compared only limited cementitious water resources are requested cast RBB, provides more economical benefits GER technique areas.