Numerical Simulation Study of Variable-Mass Permeation of the Broken Rock Mass under Different Cementation Degrees

摘要: In order to analyze variable-mass permeation characteristics of broken rock mass under different cementation conditions and reveal the water inrush mechanism geological structures containing masses like karst collapse pillars (KCPs) in coal mine, EDEM-FLUENT coupling simulation system was used implement a numerical study time-dependent change laws parameters porosity, permeability, loss rate specimens erosion effect were obtained. Study results show that (1) permeability particle migration can be divided into three phases, namely, slow-changing seepage phase, sudden-changing steady phase. (2) Specimen fillings continuously migrate run off effect, porosity rapidly increase then tend stable, firstly increases gradually decreases. (3) Cementation degree has an important on mass. As cementing force specimen is enhanced, its maximum rate, loss, all decrease. The approach not only help enhance mining operations safety by better understanding KCP risks. It also extended other engineering applications such as backfill paste piping tailing dam erosion.