Retaining-Walls for Earth. Including the Theory of Earth-Pressure As Developed From the Ellipse of Stress. With a Short Treatise On Foundations, Illustrated With Examples From Practice

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The Foundation. — The depth of the foundation must be below the action of frost; let this be assumed as 5 feet; then by (23), with x' = b feet, the maximum allowable pres- sure at the toe of the foundation is about 6000 pounds per square foot, and by (23) the minimum allowable pressure is about 200 pounds for x" = 25 feet.
Assuming that the foundation is vertical at the back and trapezoidal in section, the length of the base B" can be found from (25), which will satisfy the condition of maxi- m
...um pressure at the toe. Letting p = 5000 and x' = 5, and solving (25), B" is found to be between 12 and 13 feet; say 13 feet.
To determine if this width is sufficient to satisfy all the 60 F0ltNt)ATt0N8 FOB WALLS B&TAINING MABTS.
conditions of eqnilibrium, the resultant of all forces acting upon the base must be found.
* The total earth-pressure upon the vertical HK is about 8900 pounds. Combining this with the weight of the wall, earth supported by the wall, and that of the foundation, the resultant vertical pressure is found to be about 40,600 pounds, and is applied within the middle third of the base, about 1.7 feet to the left of the centre.


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