Name：Takayuki Yamamoto
Title：Undrained monotonic and cyclic shear characteristics of intermediate soils with different plasticity index
Guidance teacher：Satoru Ohtsuka
Outline
Niigata Prefecture received various seismic hazards due to the Chuetsu earthquake and the Chuetsu-oki earthquake. Especially, the ground disaster was remarkably seen. The ground disaster crosswires the primary cause and the cause of occurs. The necessity of the performance design has risen further now at the time of be called out the cost reduction. However, it is trouble to clear design because the handling of the intermediate soil is difficult. The design is done as the clay ground so that the structure may become a safety side when the engineering works structure is constructed on the intermediate soil land board. However, the case where the ground collapses was seen. It pays attention to the nature of soil of the damage fill in this research based on these facts, the intermediate soil to which a clear handling standard has not been established is targeted. The relation between the plasticity index and the shearing characteristic is understood by doing the monotonic and the cyclic shear test.
The finding obtained from this research is shown as follows.
1）A physical, dynamic character is different according to the revitalization for minute grain.
2）A strength increase appeared strongly in the intermediate soil made by preliminary close pressure. It will be necessary to examine this item in the future.
3）The intermediate soil accompanies an increase in the plasticity index, static strength decreases, and liquidizing strength shows the tendency to increase.
4）Toughness is low like the middle soil with a low plasticity index. Moreover, the high plasticity middle soil is expands when the cyclic shear test.
5）The plasticity index is effective.
The above-mentioned result is the one having evaluated it by the plasticity index.The intermediate soil is classified from various viewpoints, and the relation to the collapse of the soil structure is verified.
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