Abstract
In the demand for socio-economic development, today, many river dikes in Vietnam are planned to be used as roads, and this is an indispensable trend. However, these river dikes have general characteristics of being filled with various types of soil which are heterogeneous, and not being compacted following the criteria before filling, so they need to be reinforced for both ensure the flood prevention safety and meet the technical requirements of traffic roads. In Vietnam and in the world, there are no specific studies on the re-use of the existing weak soil of embankments with adhesives, namely fly-ash and cement for treatment of foundation that meet the technical requirements of the upper base layer when transportation is involved. In this study, the authors focus on the solution of using the existing weak soil of embankments with fly-ash and cement to strengthen the stability of the river embankment served as the upper base layer in the traffic load affected zone, and the river embankment sub-structure combined with transportation purpose. By using methods of laboratory experiment, the authors propose the appropriate river embankment sub-structure to guarantee flood prevention and transportation combination.
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