1646
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
1.a Direct foundation (embedded in green schist).
Figure 18 Direct foundation details on improved soil
Figure 16 Transversal section of reinforced concrete foundation with
skirt.
2. Pile foundation (embedded in green schist)
As it can be seen from the image above, we propose to make at
the edge of foundation along its perimeter, a skirt in fact or a so
called “fusta” in romanian language. The first reason to do this
is to embed the foundation in a rock with good quality, but not
on all foundation surface. The second reason is to have a havier
foundation on its edges, to prevent it’s movement during
eartquake. Also this kind of improvement reduce the pressures
on soil and increse the active surface from 54% for direct
foundation without skirt to 70% for direct foundation with skirt
as it can be seen in Fig. 12.
1.b Direct foundation on improved soil (Fig. 18) by methods
compatible with saturated soft clay with salt water; the
minimum height for slab is 5.00 m, bottom slab will be
designed as a rigid compensating box with a "skirt" on outline
circular for plastic yielding reduced growth areas and rotation.
The wind tower foundation can be optimized by making
"slurry" wall with thickness of 80 cm on circular diameter
contour ~ 20 m to 20 m depth before land improvement. Also
this kind of improvement, reduce the pressures on soil and
increase the active surface.
Figure 19 Transversal section of pile foundation.
Depending on load case in can be seen that axial forces on pile
varies a lot from compressions (+1933,63kN) at left to traction
(-9,42kN) at right. Piles for this type of foundations are 1,08 m
in diameter reinforced with 26 bars
φ
20 of steel.
3.Floating pile foundation.
For this type of foundation the distribution of piles is the
same with no. 2. Total lengh of this piles is more than 24m.
This type of foundation is applicable to the situation where
loessial soil stratum is greater than 20m.
Figure 17 Pressure under foundation with skirt.
a) indirect foundation through a system of piles - large
diameter piles connected by a slab designed as a rigid
compensating box for reduced deformations.
1 REFERENCES
Indraratna, B.; Chu, J.; Hudson, J.A. [2005] - “
Ground improvement -
case histories
”, Elsevier Geo-Engineering Book series, volume 3.
b) Mixt foundation: piles foundation on improved soil.
Moseley, M. P. & Kirsch, K. [2004] - “
Ground improvement
” 2nd
Edition, Taylor & Francis
G. F. Technical Expert S.R.L. – “
Geotechnical study for wind park
Surdila – Gaiseanca
”, [2012].
Vintila, D., Tenea, D., Chirica, A. [2010] - “
Designing optimization for
some eolian power unit taking into account the seismic loads
influence
”, Fifth International Conference on Recent Advances in
Geotechnical Earthquake Engineering and Soil Dynamics, San
Diego, California
Chirica, A., Vintila, D., Tenea, D., [2013] - “
Foundations conditions
study for aeolian power units on soft soils under static and seismic
loads. Case study
”, Seventh International Conference on Case
histories in Geotechnical Engineering, Chicago.
