Akademik Veri Yönetim Sistemi
6th International Conference on Engineering and Natural Science (ICENS 2020), Belgrade, Sırbistan, 21 Ekim 2020, ss.1-8, (Tam Metin Bildiri)
Retaining walls are rigid structures built to support
the natural or back filling soils at different elevations. Although these type
of walls are generally composed of reinforced concrete walls or gravity stone
walls, geosynthetic reinforced wall systems are also frequently preferred in
recent years. Geosynthetic reinforced walls are defined as a composite wall
system constructed by mechanically compacting the geosynthetic reinforcement
material placed between the back filling soil layers behind the wall. The
quality of the backfill behind the wall and the presence of water are very
important in geosynthetic reinforced walls as in general of retaining
structures. Applications that are not compatible with static calculations may
cause the wall to be exposed to loads higher than the design loads due to the
inability to remove the water. As a result of this situation, it is possible to
encounter visible damage to the structure. In the presented study, the
structural rehabilitation of a high geosynthetic reinforced wall constructed in
two stages is described. Damages occurred on the examined wall due to the
reasons mentioned above and thus the necessity of repair / strengthening
emerged. In this context, a new RC retaining wall with piles and buttresses was
designed in front of the lower level of the wall. The new wall has been modeled
in Midas GEN software, and the segments of the new wall, foundation and
buttresses were modelled with “Plate” elements, and piles were modelled with
“Frame” elements. p-y, t-z and Q-z springs were calculated according to the soil
structure to reflect the interaction between pile-soil. The nonlinear
load-displacement behavior of the springs was applied to the pile points in the
analysis model. The strength and bearing strength of the walls, buttresses,
foundations and piles were checked by nonlinear analysis. The presented study
is expected to be a useful tool in terms of determining the method to be
applied in the design of retaining walls under earthquake and service loads and
the parameters to be taken into account for the rehabilitation of an existing
retaining structure.