Pile Design Help
Pile Design Help
(OP)
Hello Engineers,
I am new i engineering profession.I have received a soil test report from a geotechnical investigation company.Here are the SPT values:
depth(ft)---------------------SPT N
0---------------------0
5---------------------7
10---------------------9
15---------------------11
20---------------------8
25---------------------11
30---------------------10
35---------------------17
40---------------------22
45---------------------36
50---------------------50
60---------------------50
Now how to calculate the Bearing Capacity of pile(Cast in place 18" diameter),Bearing Capacity of soil at 60 ft depth,And structural design of pile.Please any one can share with me in excel/word/pdf format.Please according to AASSHTO and ACI code.
Thanks all
RIFAT
I am new i engineering profession.I have received a soil test report from a geotechnical investigation company.Here are the SPT values:
depth(ft)---------------------SPT N
0---------------------0
5---------------------7
10---------------------9
15---------------------11
20---------------------8
25---------------------11
30---------------------10
35---------------------17
40---------------------22
45---------------------36
50---------------------50
60---------------------50
Now how to calculate the Bearing Capacity of pile(Cast in place 18" diameter),Bearing Capacity of soil at 60 ft depth,And structural design of pile.Please any one can share with me in excel/word/pdf format.Please according to AASSHTO and ACI code.
Thanks all
RIFAT





RE: Pile Design Help
RE: Pile Design Help
I presume that you are in cohesive soils since your using a bored pile. You can convert your N values to shear strength using 4.5*N= Cu(kPa). Then you could use 9*Cu for end bearing capacity and then work out shaft capacity (which is shaft area x shaft resistance). Some people may discuss the suitability of utilising bearing capacity and shaft capacity as they are mobilised at different levels of displacement.
Below are some preliminary calculations to Eurocode 7 which includes partial factors which AASSHTO etc doesnt use (i think). Although its not to AASHTO the theoretical basis should be the same.
But as OG says get a geotech involved, my above information is only the first stab.
Also, you should always prove that you have a suitable bearing stratum beneath your pile toe. If you found at 60ft depth, how do you know there is not a peat layer directly below the tip? i would consider founding at 50ft depth since you know you have 10ft of good ground beneath your pile toe.
RE: Pile Design Help