3324
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
Table 2. Speed of filtration and permeability in the steady state phase.
Velocity of filtration
(cm
3
/s)
Permeability
(cm/s)
Grad 75% 85% 95%
75%
85%
95%
20
0.009 0.014 0.017
5.5E-
06
8.2E-
06
1.0E-05
40
0.019 0.022 0.027
5.6E-
06
6.3E-
06
7.9E-06
80
0.034 0.050 0.070
4.9E-
06
7.2E-
06
1.0E-05
4 CONCLUSIONS
The results can be summarized in the following remarks:
Sandy silt soils of low plasticity, typical "Loessical
Formation" located on central Argentina, are in the limit
suffusion unstable behavior, according with previous
internationals studies.
A test protocol for evaluation of the capacity of the filter for
controlling suffusion instability was made based on set of
measurements.
In the construction of filters for hydraulic control of silty
soils stability, materials with fines content greater than 5%
have been employed. There has been a satisfactory
performance with content not higher than 30%.
The filter employed as mixtures with fines content between
15% and 25% showed the best conditions of stability. Under
these conditions, there has been a small fraction of solid
material lost. These losses occur mainly in the early stage,
prior to achieving a steady flow.
5 ACKNOWLEDGEMENT
This research was sponsored by the Department of Science and
Technology,(SECYT) Universidad Nacional de Cordoba.
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