Artificial neural networks are capable of learning complex nonlinear r
elationships from a large amount of accumulated data, and similar to h
uman brains, are noise and fault tolerant. This unique capacity sugges
ts that neural networks would be very useful in certain geotechnical e
ngineering applications. A back-propagation network is set up and trai
ned to predict the pile bearing capacity from dynamic testing data. Th
e trained network produces better results than a pile driving formula
approach. The effects of various network parameters on the network res
ults are examined in detail. The general understanding developed is po
tentially useful for the application of neural networks in other geote
chnical engineering problems.