抄録
During the course of study on the mechanism of the deterioration of bedrock (mudstone) in landslide zones, some facts were found to suggest that the softening of mudstone is mainly due to the amount of Gibbs' free energy evolved when hydrogen-bond is formed between originally adsorbed water molecules and newly adsorbed ones around clay particles.It was also found that the relationship that q=A expB (γt-γt0) which was already confirmed concerning clay soils can be applied to mudstone if the former is originated from the latter, though there is a sharp difference in the water-resistibility between them.
