The strength and microstructural properties of the backfill massif have been studied and
assessed when filling underground cavities that pose a threat of mine rocks collapsing in the
process of mining mineral deposits. It is suggested that due to a tendency to mechanical
destruction by crushing Ca–O ionic bonds rather than Si–Î covalent ones, the backfill mixture
composition is saturated with a large amount of Ca2+ ions. This leads to the formation of a
highly-basic type of hydrated calcium silicates and a decrease in the massif strength …

The strength and microstructural properties of the backfill massif have been studied and
assessed when filling underground cavities that pose a threat of mine rocks collapsing in the
process of mining mineral deposits. It is suggested that due to a tendency to mechanical
destruction by crushing Ca–O ionic bonds rather than Si–Î covalent ones, the backfill mixture
composition is saturated with a large amount of Ca2+ ions. This leads to the formation of a
highly-basic type of hydrated calcium silicates and a decrease in the massif strength …