Excerpt from Allowable Pressures on Deep Foundations

The piers Of the Cincinnati Suspension Bridge are founded on a bed of coarse gravel 12 feet below low water, although solid limestone was only 12 feet deeper; if the friction on the sides of the pier be disregarded, the maximum pressure on the gravel is 4 tons per square foot. The piers Of the Brooklyn Suspension Bridge are founded 44 feet below the bed of the river upon a layer of sand 2 feet thick resting upon bed-rock the maximum pressure is about 55 tons pea� square foot.

At Chicago sand and gravel about 15 feet below the surface are successfully loaded with 2 to 2g tons per square foot. At Berlin the safe load for sandy soil is generally taken at 2 to 2� tons per square foot. The Washington Monument, Washington, D.C., rests upon a bed of very fine sand 2 feet thick underlying a bed of gravel and boulders the ordinary pressure on certain parts Of the founds tion is not far from 11 tons per square foot, which the wind may increase to nearly 14 tons per square foot.

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