Advances in Civil Engineering / 2019 / Article / Fig 14

Research Article

Influences of Water Vapor on Roof Fall Accidents in Selected Underground Coal Mines in Malawi

Figure 14

Mass change of specimens as a function of elapsed time. The thick black line gives the regression line to calculate average diffusion coefficient. (a) Mchenga arkose sandstone. (b) Mchenga fine-grained sandstone. (c) Kaziwiziwi conglomerate. (d) Kaziwiziwi carbonaceous sandstone.