International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 316
l and foundation. To pre-vent this, strong projecting beams are built into a timberplatform running at right angles to the direction in whichthe wall would slide, as shown in Fig. 404. ■ On wet clay thefriction is about ^ the weight of the wall; on dry earth, from^ to |, and on sand or gravel, from… … b IG. 40i. ing wall under the above given conditions will not slideunder a pressure of ^, f, f, etc., of its total weight. 1486. On the Theory of Retaining Walls. —Let ahd c. Fig. 405, be a retaining wall with battered face andvertical back. Thetop b e of the back-ing is level with thetop of the…
Railroad engineering
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