Prevention of Geo-Environmental Disasters caused by the Wastes

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The subject of this research is on the utilization of waste materials through geotechnical stabilization method from the aspect of environmental geotechnology. Considering the present state on waste generation, a large amount of resources are consumed for the construction industry, while the waste disposal site has been limited. To recycle wastes is therefore required from the viewpoint of resource utilization and environmental preservation. The main results obtained are as follows ;1.The stabilization method for geotechnical waste utilization is evaluated on fluidized bed combustion coal fly ash, stainless-steel slag and municipal solid waste incinerated fly ash. Experimental studies clarifies that the coal ash and the slag can be utilized as geo-materials, and multiple use of cement and the coal ash as stabilizer can realize the stabilization of municipal solid waste incinerated fly ash.2.The utilization of waste sludge discharged from construction works is also evaluated. A system utilizing waste slurry which consists of dehydration or solidification is proposed, and it was found that density and viscosity of the slurry can be used as indexes of the criteria whether a slurry should be best treated by dehydration or solidification for recycling use.3.A new technical method, "Bagged WRP Method, " for utilizing waste rock powder is proposed. The Bagged WRP is more advantageous to the sunk-levee construction than the rock or concrete block because of its light weight, and can be effectively applied for levee construction and accompanied man-made tidal flat construction for environmental mitigation.4.The environmental impackt caused by the geotechnical recycling of surplus soil stabilized by cement is examined. Alkali migration characteristics from the tabilized soil is experimentally evaluated and the design concept forthe alkaline migration control is proposed.