Controlling factors and effect of geologic age and depositional environment on cyclic shear deformation characteristics of soils

摘要

Totally 482 cyclic shear deformation characteristics test results are collected from 95 sites in the Kanto district. They are firstly classified into 26 categories based on geologic age and depositional environment. Geological age as well as sediment conditions, confining stress and plastic index affect the cyclic shear deformation characteristics. Younger soils are easily to become nonlinear than the older soils. For sandy soils, effect of confining pressure is the largest. For clayey soils, effect of plastic index is the largest, effect of geological age is larger than sandy soils, effect of confining pressure is predominant when plastic index is less than 30, but it becomes less effective when plastic index is greater than 30, and nonlinear behavior is more possible as plastic index becomes smaller. Finally, cyclic shear deformation characteristics are compiled considering the effects of confining pressure and plastic index.