Mayne P.W.(2015). “Peak friction angle of undisturbed sands using DMT“. Proc. 3rd Int. Conf. on the Flat Dilatometer DMT’15. Rome, Italy.pp.237-242.
Mayne undertakes a systematic validation of the Ø – KD eqn by Marchetti (1997):
Ø = 28° + 14.6 log KD -2.1log2KD
by comparing the Ø values predicted by the eq. with the measured peak friction angles Ø on undisturbed samples of clean sands acquired using special field drilling methods, primarily freezing or special piston tube samplers. Mayne shows that the Ø estimated by the 1997 KD -Ø Eq. conservatively matches all the TRX Ø data.