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dissipation tests. Some cone penetration tests could not be carried out to
the full extent of the desired final depth due to attaining the maximum cone
resistance, friction or gradient.
Some exceptional in-situ measurements were carried out both on the land
and on the Westerschelde.They were pressiometer tests (in pre-bored holes),
dilatometer tests and in-situ pore permeability probe tests. The rigidities
in the Boom clay and the sand deposits respectively were established from
the pressiometer and dilatometer tests.
Laboratory research
The layers and samples which had to be tested in the laboratory were deter-
mined on the basis of the interpretations of the drilling and cone penetra-
tion results. In this, various selection criteria were dealt with such as the
positioning of the layers in respect of the access ramps and the tunnel, the
variations to be expected from and within the layers, and also the geotech-
nical properties to be expected from the layers, both during the drilling
process and during the operational phase of the tunnel.
Nature and size of the
laboratory research
carried out
Fig. 7.7
Test
Undertaken
Spread of grains
158
Natural moisture content, volumous weights,
degrees of saturation and pore content
89
Lime content
10
Humus content
10
Plasticity index (Atterberg limits)
85
Determination of the types of clay minerals
4
Determination of the KAS characteristics
(the form and angularity of sand grains)
44
Direct shear test
- Water content
16
16
Uniaxial strength test
82
Triaxial test (unconfined undrained and confined drained)
5
Oedometer test
- Water content
- Content of organic fragments
- Specific gravity
59
58
57
10
Determination of indicative number of Poisson's ratio
5
Specific gravity
10
Permeability of sand
10
Permeability of clay
10
Adhesion of clay
9
pH sand
5
pH clay
5
Clay activity
73
Mineralogy sand
10
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