6th International Conference on Engineering and Natural Science (ICENS 2020), Belgrade, Serbia, 21 October 2020, pp.1-8
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.