The authors have been involved with the evaluation of physico-mechanical properties of mudstone as a function of water content. Furthermore, they have attempted to evaluate groundwater diffusion characteristics of mudstone and related volumetric changes. In experiments, some samples failed along some existing structural weakness planes and the experiments also revealed physico-mechanical characteristics of these weakness planes related to faulting in Shimajiri formation during their tectonic past. The authors present the outcomes of various experiments and discuss their implications in practice.

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