The protection for the potential of erosion at the Nanjung Tunnel has been effectively and efficiently done by Maccaferri Indonesia by growing vegetation.
The surrounding slopes around Nanjung tunnel required treatment for potential erosion. Most of the soil on the cut slopes consists of fine-grained soil. Maccaferri Indonesia provided the right solution to overcome the potential for erosion by growing vegetation.
The Nanjung Tunnel Project is located in Bandung, West Java. This tunnel has purpose to facilitate the flow of the Citarum River, so it can overcome the flood problem in Bandung. Tunnel operations are intended to reduce the flood area from 490 hectares to 80 hectares. Nanjung tunnel consists of 2 tunnels with a length of 230 meters each and a diameter of 8 meters. The tunnel will also increase the capacity of the Citarum River from 570 cubic meters per second to 669 cubic meters per second. The construction for the Nanjung Tunnel was carried out by contractors PT. Wijaya Karya (Persero) Tbk and PT. Adhi Karya (Persero) Tbk – join operation.
The surrounding slopes around the tunnel need to be protected from the potential erosion. The slope which is mainly composed of fine-grained soil required protection from erosion created by rain and surface water flow. The selection of the right solution is necessary in order to prevent failure by the presence of water. Erosion Control Solution by Maccaferri Indonesia was selected considering its ability to allow surface seepage and to grow vegetation (LCC – Legume Cover Crop).
An Erosion Control System made of a combination between HDPE Geomat and double-twisted wire mesh panel with longitudinal high tensile strength steel cables called MacMat HS® was installed on the slopes. After MacMat HS® is properly installed on the cut slopes, the next step is to apply the array of mulching on the surface of MacMat HS®. The materials for the mulching consist of planting media, seeds, and fertilizers. The vegetation shall bring the nature back as rehabilitation. Available in rolls, MacMat HS® has an easy installation procedure with the support of a T-shaped deformed bar to hold the mesh onto the cut slope. Maccaferri Erosion Control System shall grant some advantages such as: Easy and Quick Installation; Allows drainage on the surface of the slope; Allows vegetation as rehabilitation; Capable for combination with Soil Nailing; Suitable for steep slopes.
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