The project that is located in a hilly area requires massive cut and fill work in order to get the designed runway level. In addition, there are several challenging factors that take effect, such as: the high seismicity, heavy rainfall, and the soil. Maccaferri Indonesia responded to those challenges with Paramesh solutions.
The retaining wall height that must be reached for the Buntu Kunik Airport runway is 40m. With several technical constraints, the Buntuk Kunik Airport project is a challenging project. During the design phase, several types of retaining structures were considered until Maccaferi’s Paramesh solution was selected.
Buntuk Kunik Airport, Tana Toraja is located in Mengkendek District, Tana Toraja Regency, South Sulawesi Province, Indonesia. This airport was built to replace Potingku Airport which is located in Rantetayo. With the Buntu Kunik Airport, tourists and visitors in Tana Toraja have an alternative air route, apart from the land route which takes 8-9 hours. With these facilities, the government aim that it will increase the development of tourism in Tana Toraja.
Buntu Kunik Airport is built on 141 hectares of land with a 94 m x 67 m Apron, 124 m x 15 m taxiway, and an initial runway of 1,700 m which can be landed by ATR 72 aircraft.. The terminal building can accommodate around 150 passengers with an area of 1,152 m2.
The runway test using Wings Air aircraft were carried out on August 20, 2020 and one week earlier the Hawker 900 XP calibration type aircraft belonging to the Ministry of Transportation had also landed at Buntu Kunik Airport.
The airport project is located on a hilly area which are in the path of the runway construction, so massive cut and fill work was required to obtain the designed runway height, which is 40 m. This work must be balanced with adequate soil reinforcement solution with affordable cost. The technical obstacles faced are the high seismicity, high rainfall, and the type of clay shale subgrade. Clay shale soil is dry, hard, and has high shear strength. If it is exposed to water, it will quickly turn into soft clay with low shear strength. Due to these circumstances, good design and construction is needed to minimize the exposure of subgrade to weathering.
During the design phase, several retaining structures were considered; traditional concrete wall, bore pile and Hybrid MSE Wall or Paramesh. Some of the solution criteria for this project are:
1. It has a permeable surface, capable to rapidly drain the rainfall waters and removes hydrostatic pressure in landfill;
2. The retaining structure must be flexible to accommodate differential settlement and absorb dynamic shocks;
3. Relatively quick for construction time;
4. Affordable costs.
Based on all the criteria, Maccaferri’s Paramaesh solution was chosen. The Paramesh structure consists of Terramesh combined with Green Terramesh and Paralink. This solution can hold up to 25 m high and consists of 5 berms. The main reinforcement comes from Paralink which has a tensile strength equivalent to 300kN / m. Progress on segment 1 started in October 2015 and was completed in early 2016.
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