rock bolt

noun Mining, Civil Engineering.
a steel or fiberglass bolt inserted and anchored in a hole drilled in rock to prevent caving of the roof of a tunnel or subterranean chamber.

Origin:
1955–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

rock bolt

in tunneling and underground mining, steel rod inserted in a hole drilled into the roof or walls of a rock formation to provide support to the roof or sides of the cavity. Rock bolt reinforcement can be used in any excavation geometry, is simple and quick to apply, and is relatively inexpensive. The installation can be fully mechanized. The length of the bolts and their spacing can be varied, depending on the reinforcement requirements.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
In general, results indicate that tendon reinforcements are in better condition relative to rock bolt reinforcements.
The targets were screwed into reusable holes that had been drilled and tapped in rock bolt plates.
Stabilization would be accomplished with either rock bolt anchors or a localized cable net system.
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