EFFECT OF ION EXCHANGE IN STABILITY OF EARTH SLOPE

Abstract

In analysis of the causes of the landslide that occurred at Kashio in Central Japan, the author has paid close attention to exchangeable ions contained in soil and the effect of groundwater on soil at the site. Chemical analysis shows that the soil forming the unstable slope is partly saturated with calcium ions in its natural state, and that the artificial soil which is derived by supplying with calcium ions to saturation exceeds the original one in shearing strength. The author has thus reached a conclusion that the stability of slope was upset through loss of calcium ions out of slope soil by seepage water.