Weathering of geomaterial

Deterioration of strength and deformation characteristics of geomaterials due to slaking



Sedimentary soft rock such as mudstone is subjected to slaking due to repeated dry/wet cycles, resulting in a significant decrease in strength and a slope failure. Since the slaking depends on the moisture condition of the geomaterial before wetting, the mechanism of slope instability cannot be explained by rainfall alone and is very complicated. We conduct field surveys and advanced laboratory tests to investigate the mechanism of deterioration of strength and deformation characteristics of geomaterials due to slaking.

Analysis of slaking-induced landslide cases based on satellite information



Slaking-induced landslide is caused by repeated dry/wet processes, which is also associated with extreme drought and heavy rainfall due to climate change. We are conducting site investigations and analysis of change in rainfall and soil moisture using satellite observation technology, which lead to development of prediction method of slaking-induced landslide on a global scale.

Strength reduction of artificial rock due to temperature gradients



Heat weathering causes thermal fatigue failure of rocks due to repeated heating and cooling, and in a natural state, the acceleration of heat weathering is relatively fast. We have developed a temperature controllable loading apparatus and are studying the effect of temperature gradients in artificial soft rock specimens on strength and deformation characteristics.