International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 312
the yielding of fresh mortar,and if not more than \ inchfor each foot in thicknessof wall at a, it need notcause apprehension. Sometimes retaining wallsfail on account of the com-pression of the backing,causing settlement and in-creased pressure against thewall. This is especially fre-quent where… … Fig. 400. 902 RAILROAD CONSTRUCTION. 1483. Offsctted Back.—Having proportioned a re-taining wall a b dc in Fig. 401, by the foregoing rule, wecan, by offsetting the back, as shownin the figure, considerably increase itsstability without adding to the volumeof the masonry. The offsets are determined…
Railroad engineering
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