Impact assessment of environmental quality and its control in geotechnical engineering
Kamon Masashi; Katsumi Takeshi; Ying Chang Yun
Abstract:The assessment and control of the geoenvironmental impact of the environmental qualities such as alkali and acid were presented. On the soil acidification caused by acid rain, negative influence on the engineering properties of the stabilized soil was experimentally clarified. The neutralization mechanism of the stabilized soil was summarized referring to the depletion step of Ca2+. The method of predicting neutralization of the stabilized soil ground was proposed. Alkali migration characteristics from the stabilized soil were also investigated referring to the buffer ability of filtration layer. It is suggested from the experimental result that the batch method ordinarily applied will overestimate the buffer ability. For the application of the stabilized soil to embankment, the minimum thickness of the filtration layer to prevent the alkali migration was calculated from the proposed parametric analysis, and the importance of permeability and workability of the materials as well as the neutralization ability were emphasized. Key Words:acid rain, alkari, anion, buffer ability, cation, geoenvironment, leachate, pH, soil stabilization