Impact assessment of environmental quality and its control in geotechnical engineering

摘要

The assessment and control of the geonenvironmental 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 stabilizedsoil was experimentally clarified. The neutralization mechanism of the stabilized soil was summarized referring to the depletion step of Ca{sup}2+ . The method of predicting neutralization of the stabilized soil ground was proposed. Alkali migrationcharacteristics 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 theapplication 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 aswell as the neutralization ability were emphasized.