751.39 Pile Footings

Water elevation to be determined for site conditions by preliminary Design Section. Generally less than the average of high and low water.

Determine uplift force per pile by deducting weight of seal course and friction between seal course and sheet piling of cofferdam from uplift produced by hydrostatic head “$\,h$”.

Use friction value between seal course and sheet piling of $\,2lbs./in.^{2}$ acting on Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \, (perimeter \times depth)} of seal course.

Allowable uplift force per pile shall be determined by minimum of:

1.	Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \, 10 lbs./in.^2} frictional force to Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \, (perimeter\ of\ pile \times depth\ of\ seal\ course)} .
2.	Pullout capacity of pile;
	In saturated SAND Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \, (F = 5.0PL^2)}
	Where:
	Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \, P} = perimeter pile in feet
	Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \, L} = embedded length of pile in sand (ft.)
	In saturated CLAY $\,(1.75lbs./in.^{2}$ frictional force to Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \, (perimeter\ of\ pile \times embedment\ length\ of\ pile\ in\ clay)} .
3.	Maximum pullout of 12 kips or 20% of maximum friction pile load.