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Problem: Infrastructural damage due to heavy rainfall from months of Typhoons.
Solution: Vegetated Geogrid Wall |
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This project was located at 1000m above the sea level of Yi-Lan in Taiwan, in the fragment of Yi-Lan-I road 11k+500, which is also the road leading to National Taipingshan forest recreation area. From 2005/7/16 to 2005/10, about two and half months, experienced the abundance amount of rain caused by HAITANG and other 6 Typhoons. According to Central Weather Bureau, the information shows that the total amount of rain accumulated between the Typhoons was 994mm, which caused the road construction to be damaged by the sliding of slope, and disconnect for more than 6 months. The project was application of Reinforced slope with warp-around facing in this case. The designers were considering to construct 70 meter length which is along the original road line.
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The reinforced slope height was designed from 22m to 30.5m following in-site landform which slope was 1：0.5(V：H). Individual stage was more than 5m and constructed 5 to 6 stages along on different road slope. The embedment length were designed 18m, 18m, 16m, 12m, 9m and 6m, respectively. The geogrids were made of multifilament polyester yarns and coated with PVC where the ultimate strength designed 200kN/m, 150kN/m and 100kN/m in the project, respectively. The project was completed in 60 days. The facing system was placed with PE vegetation soil bag. It has been 14 months since the road is repaired and paved asphalt. Since the completion of the project there is no significant settlement on reinforced slope. Two lows of driven piles were constructed under base of first stage reinforced slope. The length of pile is 9m, its diameter is 0.3m and was driven about 1m to 2m in bed rock. The construction site in Yi-Lan of Taiwan has a lot of rains. To have an effective prevention of damage from abundance rain in every protecting layer, slope was installed with a very complete system of drainage including the installation of oriented flow system. Inside of the slope was set with geopipe for drainage and filtration material. The most important was that the filling soil had a good permeability because of the granulated shape, which permitted the whole structure to become safe with high drainage and an ecological scene of artificial reinforced slope.
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In Taiwan because of the geography and weather conditions, it was very difficult to obtain the nature granulated soil stones. To obtain a good quality of filling material, the whole construction project would also be considerably expensive. The filling soil of this project used the gravel material acquired from the riverbed because of the river dredge season; this decreased the cost of the construction project. At the same time the project was located on a mountain area (1000m above the sea level) which was a heavily raining area. Because of the filling granulated soil, relatively the density achieved its control, therefore made the reinforcement structure to become an artificial structure with numbers of holes with drainage function that allowed the construction to be in schedule without problems. This case history was donated to IPAFES by ACE Geosynthetics, a world leader in innovative product applications. |
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Factory: Gold-Joint Industry Co., Ltd.
No.8,Kung 10 Rd., Yu-Shih IND. Park, Tachia, Taichung, Taiwan, R.O.C. |
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