Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Cemented tailing backfill (CTB) in underground mine inevitably experiences seepage field, which complicates its mechanical behavior. In this study, the properties and microstructure characteristics of CTB under different water pressures (SWPs) were investigated. The results show that, with increase SWP, decrease, but decreasing trend reduces gradually. Higher SWP leads looser more porous, largest proportion pores initiated propagated by is micropores, means damage mostly caused micropores. Besides, decrease exponentially porosity present linearly inverse proportional relation to pore area fractal dimension. Results above indicate that has a significant deterioration effect on CTB. research could not only extend knowledge also provide theoretical reference for index determination stability analysis water-rich mines.