Advances in Civil Engineering / 2019 / Article / Fig 12

Research Article

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

Figure 12

Bulk density variation against humidity. (a) Mchenga arkose sandstone. (b) Mchenga fine-grained sandstone. (c) Kimachi sandstone.
(a)
(b)
(c)