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- Q870545 subject Q6163851.
- Q870545 subject Q6782647.
- Q870545 abstract "A cave-in is a collapse of a geologic formation, mine or structure which may occur during mining or tunneling. Geologic structures prone to spontaneous cave-ins include alvar, tsingy and other limestone formations, but can also include lava tubes and a variety of other subsurface rock formations. Glacier caves and other ice formations are very prone to collapse from exposure to warm temperatures or running water.In mining, the term roof fall is used to refer to a many types of collapses, ranging from the fall of a single flake of shale to collapses that form sink holes that reach to the surface. However, roof falls in mining are not all accidental. In longwall mining and retreat mining, miners systematically remove all support from under large areas of the mine roof, allowing it to settle just beyond the work area. The goal in such mining methods is not to prevent roof fall and the ensuing surface subsidence, but rather to control it.".
- Q870545 thumbnail Cave-in_(indust).jpg?width=300.
- Q870545 wikiPageWikiLink Q1405154.
- Q870545 wikiPageWikiLink Q1550225.
- Q870545 wikiPageWikiLink Q188734.
- Q870545 wikiPageWikiLink Q202816.
- Q870545 wikiPageWikiLink Q239276.
- Q870545 wikiPageWikiLink Q27919.
- Q870545 wikiPageWikiLink Q285831.
- Q870545 wikiPageWikiLink Q34.
- Q870545 wikiPageWikiLink Q381176.
- Q870545 wikiPageWikiLink Q40691.
- Q870545 wikiPageWikiLink Q44377.
- Q870545 wikiPageWikiLink Q44497.
- Q870545 wikiPageWikiLink Q448331.
- Q870545 wikiPageWikiLink Q6163851.
- Q870545 wikiPageWikiLink Q6782647.
- Q870545 wikiPageWikiLink Q7316927.
- Q870545 wikiPageWikiLink Q751300.
- Q870545 wikiPageWikiLink Q849953.
- Q870545 comment "A cave-in is a collapse of a geologic formation, mine or structure which may occur during mining or tunneling. Geologic structures prone to spontaneous cave-ins include alvar, tsingy and other limestone formations, but can also include lava tubes and a variety of other subsurface rock formations.".
- Q870545 label "Cave-in".
- Q870545 depiction Cave-in_(indust).jpg.