Lattice Boltzmann Numerical Study on Mesoscopic Seepage Characteristics of Soil–Rock Mixture Considering Size Effect

One of the hot topics in study rock and soil hydraulics is size effect a soil–rock mixture’s (SRM) seepage characteristics. The process SRM was simulated from pore scale through lattice Boltzmann method (LBM) this paper to explore internal influence mechanism sample on samples were generated using improved Monte Carlo (IMCM), 342 simulation test conditions feature parameters such as resolution (R), segmentation type, model (S), length ratio (F), soil/rock particle (P) examined. demonstrated that R increases, permeability gradually rises tends stabilize when reaches 60 ppi. At same S, dispersion degree obtained by four types order center < random equal top. With an increase (k) decreases, conforming dimensionless mathematical model, k=a0·S−b0, at S = 80 mm. F exhibits linear “zonal” distribution declines order. When greater than 12, value especially small. P, decreases before rising abruptly. P crucial for grading structural makeup SRM. Overall, concludes ppi, mm, ≥ set demand can be used select generate optimal representative elementary volume (REV) numerical calculation model. serve general reference engineering construction common geotechnical material.