978 resultados para Mine timbering.


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1909-18, 1927-34, 1936, 1938 issued in 2 vols. each year; 1919-24, issued in 3 vols. each year.

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Mode of access: Internet.

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"Coal Industry Advisory Committee to the Ohio River Valley Water Sanitation Commission. Research project no. 370-8."

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"Commonwealth of Pennsylvania Department of Health. Industrial fellowship no. 326B-6."

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Four mine waste beach longitudinal profile equations are compared theoretically and in statistical analyses of profile data from 64 field and laboratory beaches formed by mine tailings, co-disposed coal mine wastes, and sand. All four equations fit the profile data well. The best performing equation both accounts for particle sorting and satisfies hydraulic constraints, and the combination of assumptions underlying it is considered to best represent the processes occurring on mine waste beaches. Combining these assumptions with the Lacey normal equation leads to a variant of the Manning resistance equation. Features that it is desirable to incorporate in theoretical and numerical models of mine waste beaches are listed.