79 resultados para Tunnel lining.


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"Performing organization: San Francisco Bay Area Rapid Transit District"--Technical report documentation page.

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Mode of access: Internet.

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[taken at media day]

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Urban Mass Transportation Administration, Washington, D.C.

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"March 1993."

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"February 1977."

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National Highway Traffic Safety Administration, Washington, D.C.

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"This work was supported in part by the Office of Naval Research under Contract No. Nonr-1834(15)"

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The development of sand ripples in an oscillatory-flow water tunnel was observed in 104 laboratory experiments approximating conditions at the seabed under steady progressive surface waves. The period, T, and amplitude, a, of the water motion were varied over wide ranges. Three quartz sands were used, with mean grain diameters, D = 0.55, 0.21, and 0.18 millimeter. In 24 experiments, with the bed initially leveled, T was reduced until ripples appeared, and their development to final equilibrium form was observed without further change in T. The remaining 80 experiments investigated the response of previously established bed forms to changes in T or a or both. The ripple length, lambda, and height, eta, were measured from photos, except when bed forms were three dimensional.