To increase nickel production capacity, it is necessary to build a new smelter in a limited area the retaining wall structure acts as a base foundation that is able to withstand loads of the new smelter construction.
One of the challenges in the field is the high earthquake potential and a horizontal earthquake acceleration of 0.25g, which were considered crucially during the design process.
Cited from newsmetal.com, Jinchuan Group, in collaboration with Indonesian company WP & RKA has started the construction of a laterite nickel project on November 25, 2016 at Obi Island, North Maluku. The project is estimated to have a total investment of USD 658 including mining, smelting, and power plant. The project is also estimated to be able to process 1.80 million tonnes of ore annually.
To increase nickel production capacity, the owner decided to expand the smelter construction. Concerning the decision, a retaining wall structure is needed as a base foundation that is able to withstand loads of the new smelter construction. The retaining structure varies from 5m to 20m in height. The area also has a high earthquake potential and a horizontal earthquake acceleration of 0.25g which should be considered during the design process.
Maccaferri Indonesia proposed a Paramesh system to answer the owner’s needs. The Paramesh system is a retaining wall system that is flexible, environmentally friendly, and cost-effective compared to traditional concrete structures. The Paramesh system consists of primary reinforcement using Geogrids, Terramesh as secondary reinforcement made of 8x10cm double twisted wire with a layer of galvanized steel wire and polymer, MacTex non-woven geotextile behind the Terramesh unit as a separator, and MacDrain as geocomposite drainage to drain water from soil embankment. Paramesh system construction does not require a specialist contractor or labor for construction. Quality control on site is strictly monitored by Maccaferri product assistance. All Stability checks of the structures in static and seismic conditions were performed using Macstar, an internally developed software by Maccaferri.