Evaluation of complex CPTu dissipation tests of B.E.S.T.

The u2 complex pore water pressure dissipation tests made in NC-LOC sandy soils at the Bolivian test site were evaluated with the variants of a mathematically precise, automatic method in the function of the testing time. The identified c became near constant and its error became small after a so called minimum testing time tmin < t50 depending on the variant. The traditional t50 method failed in some cases since the tests were with types I, II, III, V and t50 varied from 4s to a value being larger than 15 min (not measured).