Mat foundation pile spring constants 1

[Frank88]

I am using several Mat Foundation analysis and design software packages (e.g. PCA-Mat). The software requires the user to input the spring constant for the piles (subgrade reaction to the pile), in my case a pile embedded in a 50 ft layer of stiff clay (good material) with skin friction only. I am ignoring axial compression of the steel H-pile. The only text I found on this subject was by the author TENG, who only showed a simple table with friction values in psf. ......Do you know of a good reference describing how to determine a value for a Pile Spring Constant (say, kips/ft), Skin Friction only in Stiff Clay? 40 tn pile. Sincerely,

 

[civilperson]

Assume that an inch of movement is failure, thus constant < 80 kips/inch.

 

[BigH]

I'd suggest that you obtain M.J. Tomlinson's book on Pile Design and Construction. It is quite good and, if I remember correctly, it will have what you want (Viewpoint Press).