Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thorough stress-strain tests at copper mine in Michigan were used to show how water weakens roof strength; it is observed that almost all of roof failures are in compression, beginning with low-angle shears rather than tension cracks; most of failures occur several days or weeks after roof has been exposed; failures are predominantly in humid and partly seasonal areas; failures are progressive -- newly exposed layers failing successively until high arch is formed; stresses are directional, producing failures more often in openings of certain orientation.
Thorough stress-strain tests at copper mine in Michigan were used to show how water weakens roof strength; it is observed that almost all of roof failures are in compression, beginning with low-angle shears rather than tension cracks; most of failures occur several days or weeks after roof has been exposed; failures are predominantly in humid and partly seasonal areas; failures are progressive -- newly exposed layers failing successively until high arch is formed; stresses are directional, producing failures more often in openings of certain orientation.
How moisture affects mine openings
Eng Min J
Parker, J. (Autor:in)
1966
3 pages
Aufsatz (Zeitschrift)
Englisch
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