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Bolts driven into the roof (and sides) of the roadway to hold spreader plates and sheeting in place - something like 1 inch diameter bolt with a significant nut - mainly to stop loose stuff falling in. The section of bolt between the epoxy and nut is in tension - the excessive length is to reach solid (or at least immobile) strata. Perhaps I should have placed more emphasis in 'coal mine' and (implied) underground. Illustration to follow (not my finest work)
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MrE
Without being all tester, isn't that a compression problem? Whereas the bolts in the ground to hold a sail in place is more of a tensile elastic problem?