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Premier Symposium Méditerranéen de Géoengineering «SMGE09» Alger 20 et 21 juin 2009
Table 6. Deflections obtained with PLAXIS ® .
Hypotheses
Deflections [μm]
Df 1 Df 2 Df 3 Df 4 Df 5 Df 6 Df 7 Df 8 Df 9
1 118 66 44 35 24 16 10 6 3
2 156 88 57 44 27 17 10 6 3
3 101 53 34 26 17 11 7 5 3
4 76 49 33 26 17 11 7 5 3
5 90 60 40 30 18 11 7 4 3
6 177 83 45 32 18 10 6 4 3
7 92 45 26 19 12 8 6 4 3
Figure 6 shows the deflection basins obtained taking into account the various hypotheses. The
same figure also shows the deflections of three FWD tests (20 kN load) performed in situ during
one of the campaigns (Pk3+750, Pk3+875, Pk3+975).
Figure 6. Deflection basins obtained through numerical modeling and in situ test campaign.
From the analysis of results, it is possible to conclude that the layers of lime treated soil can
present values of the deformation modulus ranging from 300 to 600 MPa. The equivalent
deformation modulus calculated using the maximum deflection obtained at the Pk3+750 test
(210 μm) is 200 MPa. This value is higher than the one specified in the design (120 MPa).
4. CONCLUSIONS
The use of lime treated soils during the construction of the substructure of road pavements is an
ancient technique, yet not common in transportation infrastructure construction practice in
Portugal. Nevertheless, during the construction of the two highways that technical solution was
applied. The falling weight deflectometer equipment was used to perform in situ tests.
The use of numerical analysis of obtained results allowed to estimate the values of the
deformation modulus of the lime treated capping layer. It was observed that the values of the
deformation modulus obtained are higher than the pre-established ones.