| Summary: | Malioboro City Project is a superblock project which consists of a hotel, two apartments and a shopping center buildings. One of the early work of the project is to hoard the native soil about five meter tall so its elevation equal to the elevation of the road in front of the project area. East side of the project is bounded by the presence of the river , so on that side soil embankment is relative vertical. The developer has built a retaining wall of stone masonry on the east side in order to prevent the sliding. Retaining wall was built directly behind the dike of the river. The existence and base elevation difference between these two buildings that caused the retaining wall is interesting to be analyzed.
In this research, the author analyze on a retaining wall that is in the project. The analysis is about the stability of the structure and the cost of wall construction. Moreover, the author also plan some types of retaining wall that were applied in the same place, that is reinforced concrete cantilever wall, gabion wall and geosynthetic. Each alternative has the characteristics of calculations in its design. Author use data from native and pik soil field and laboratory tests as the required data in the analysis and design.
The results of evaluation stated that the retaining wall on Malioboro City Project is not safe . The safety factor value in static condition is 1,35 (not safe) in sliding and 2,99 (safe) in overturning stability, while the bearing capacity of soil is only 63,18 kN/m2 (not safe). Unsafe factors is caused from base ground support and the shape and dimensions of the retaining wall has been built. When viewed in terms of cost, geosynthetic reinforcement is the cheapest type of construction, while the reinforced concrete cantilever wall is the most expensive.
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