Field Vane Test FVT
(1) Examples of correction factors to obtain the undrained shear strength from the measured value are shown in figures G.1 and G.2, based on local experience and back calculations of slope failures.
(2) Correction factors based on figure G.1 may be used in soft normally consolidated clays.
(3) Correction factors based on figure G.2 may be used in overconsolidated clays.
(4) If more than one method correcting the measured value is used, the value of the correction factor which will give the lowest value of the undrained shear strength should be applied.
(5) A greater correction factor than 1,2 should not be used without support from supplementary investigations.
(6) In fissured clays a correction factor as low as 0,3 can be necessary. For additional information and examples, see Annex M
Figure G.1: An example of correction factors for c^ based on liquid limit for normally consolidated clays
Figure G.2: An example of correction factors for c^ based on plasticity index and effective vertical stress a,1 for overconsolidated clays
(1) The following is an example of correlations that may be used to determine the value of the one-dimensional tangent modulus E^ = tid/de from results of DMT tests:
in which Rm is estimated either on the basis of local experience or using the following relationships:
- if 0,6 < km < 3,0; then Rm = Rmo + (2,5 - Rmo) log /Cdmt>
- if Admt > 10; then Rm = 0,32 + 2,18 log Admt if values of Rm < 0,85 are obtained in the above relationships, Rm is taken equal to 0,85. For additional information and examples, see Annex M.
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