Murata Haruki

Examination of particle-type numerical analysis method for soil destruction

Fukumoto Yutaka

There are two factors that can be cited as the effects of weathering deterioration of the ground material: physical action and chemical action. The physical action is the difference in the coefficient of thermal expansion between the minerals in contact and the water in the gap.  The expansion and contraction of the volume resulting from repeated freezing and thawing. On the other hand, the chemical action is mainly the biological activity on the ground and the oxidation by sunlight.  Understanding the behavior and the accompanying intensity change is meaningful in creating the ground weathering as a numerical analysis model.
Through this study, it was found that it is necessary to set Horizon ƒÂ to 4 or more for the compression test reproduction of soil-based specimens regarding how to take the range of Horizon ƒÂ, which is the specification of PD. Also, due to the difference in fracture index G0.  There was no significant change in the fracture morphology, but there was a change in the peak of the uniaxial compressive stress. On the other hand, the difference due to the decrease in the Young's ratio decreased the peak stress and the ascending angle to the peak stress. 
Future tasks include adjusting the fracture index and Young's modulus to bring the stress and strain analyzed with slightly smaller values closer to the values of the actual uniaxial compression test, and parameters that correlate with the water content ratio.  For example, to discover.