This paper presents a new earth reinforcement method by soilbags ("Donow" in Japanese) and its engineering applications. The materials inside soilbags can be any excavated soils, construction wastes, and even volcanic ashes, coal ashes as well as dewatered muddy silt. A series of unconfined compression tests on soilbags with various inside materials have been carried out and their results are reported. The engineering applications include the reinforcement for soft building foundation, the construction of retaining walls and embankments to divert the flow of volcanic mud. The earth reinforcement using soilbags has many merits to our environment, such as the effective recycle of waste materials, no use of any chemical agents that may pollute the surrounding foundation, less noise during construction compared to the pile driving and even the reduction of traffic-induced vibration. This paper also reports an example of measurement of the traffic-induced vibration in a field where the soft ground has been reinforced by soilbags.
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