Negative Skin Friction?
Negative Skin Friction?
(OP)
I haven't done much pile design and I am sure this question is an easy one for you geotechnical experts. The geotechnical report that I am reading is suggesting that negative skin friction -10 kPa from top of pile to -20 kPa to the bottom of the engineering fill (5 meters below grade.) What is negative skin friction, how is engineering fill causing it and how do I account for it? Actually, any free online resources for pile design? Would appreciate it. Thanks.
Clansman
If a builder has built a house for a man and has not made his work sound, and the house which he has built has fallen down and so caused the death of the householder, that builder shall be put to death." Code of Hammurabi, c.2040 B.C.





RE: Negative Skin Friction?
RE: Negative Skin Friction?
RE: Negative Skin Friction?
You can also apply the load where it is applied but this only will have some effect when using some nice FEM or specialized pile design software.
RE: Negative Skin Friction?
A positive skin friction goes against the direction of gravity, while negative skin friction means the soil sinks/drags the pile, like throwing a stone into muddy swamp. I heard piles were nowhere to be found, could be a joke though. But, you need to consult with your geotech to determine the proper method to overcome this phenomenon.
RE: Negative Skin Friction?
RE: Negative Skin Friction?
http://www.vulcanhammer.info/soils/piles/dpf.pdf
http://www.pz27.net