Geoscience Reference
In-Depth Information
Figure 1
Location of the sites.
the Itariri river and Mucambo river walls. The scatter of the vane test results can
be attributed mainly to the organic matter content in the soft clay.
2.2 Case Histories Studied
Five case histories of bridge abutments using geotextile reinforced retaining wall
structures were selected. Due to the similarity between the general conditions of
the sites, the designers suggested the use of a rather standard cross section for the
reinforced embankment. The main characteristics of these case histories are
summarized below.
2.2.1 Sauipe River Structure
This structure was 2 m high and was built on a foundation soil consisting of a
4.5-m-thick clayey sand layer overlaying a 5.7-m-thick organic clay layer. A typical
cross section of the subsoil and relevant dimensions are presented in
Table 1
.
The
main geometrical characteristics of this wall are schematically presented in
Fig. 3
and in
Table 2
.
The wall facing units were āLā-shaped and made of concrete in a
segmental fashion. The dimensions of the facing units for all structures were the
same, being 0.6m high, 0.55m wide, 0.09m thick, and 1.0m long. The fill
material for the Sauipe River structure was a fine silty sand present in the region,
and its characteristics are summarized in
Table 3
.
The reinforcement used in this
case history was a needle-punched nonwoven geotextile, made of polyester,
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