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- Curved support for roofs of openings in mines; constructed archways in masonry.
- The development of peripheral cracks around an excavation due to the difference in stress between the skin rock and the rock in the stress ring. See also: V-arching
- The folding of schists, gneisses, or sediments into anticlines.
- The transfer of stress from a yielding part of a soil or rock mass to adjoining less yielding or restrained parts of the mass. ASCE
- The fretting away of the periphery of a rock tunnel, usually converting it from a rectangular to a circular or elliptical section. The effect in the back is sometimes referred to as the "natural arch." The putting in of a lining built to an arch shape should not be referred to as arching but as "lining" or "putting in the arch." Spalding
Source: Dictionary of Mining, Mineral, and Related Terms