<正> The change rules of displacement field characteristics of coal seam and tun-nel's surrounding rock were obtained by means of numerical simulation-FLAC3
<正> The effective diffusion coefficients in mine ventilation-flows had been obtained as 4 to 200 m~2/s by matching the measured concentration-time curves with
<正> The difficulty of selecting appropriate rheological model and parameters for the alternating distribution of soft and hard rock layers was often encountere