A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Kettlebottoms: Their Relation to Mine Roof and Support
Kettlebottoms are columnar masses of rock--the preserved casts of ancient tree stumps--embedded in coal mine roof strata (of which they are a part). Because unsupported kettlebottoms can detach from mine roof without warning, they are a hazard to miners. The primary objectives of this investigation were to better define and describe kettlebottoms and to evaluate kettlebottom support techniques in terms of safety and effectiveness.
Kettlebottoms: Their Relation to Mine Roof and Support
Kettlebottoms are columnar masses of rock--the preserved casts of ancient tree stumps--embedded in coal mine roof strata (of which they are a part). Because unsupported kettlebottoms can detach from mine roof without warning, they are a hazard to miners. The primary objectives of this investigation were to better define and describe kettlebottoms and to evaluate kettlebottom support techniques in terms of safety and effectiveness.
Kettlebottoms: Their Relation to Mine Roof and Support
F. E. Chase (author) / G. P. Sames (author)
1983
18 pages
Report
No indication
English
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