Effects of physical properties and undrained cyclic shear conditions on the pore water pressure responses of saturated sands and clays

Nhan Tran Thanh; Hiroshi  Matsuda; An Tran Thi Phuong; Nhan Nguyen Thi Thanh; Tien Pham Van; Thien Do Quang

doi:10.15625/2615-9783/17568

Author affiliations

Authors

Tran Thanh Nhan University of Sciences, Hue University, 77 Nguyen Hue, Hue, Vietnam
Hiroshi Matsuda Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi, 755-8611, Japan
Tran Thi Phuong An University of Sciences, Hue University, 77 Nguyen Hue, Hue, Vietnam
Nguyen Thi Thanh Nhan University of Sciences, Hue University, 77 Nguyen Hue, Hue, Vietnam
Pham Van Tien Institute of Geological Sciences, VAST, Hanoi, Vietnam
Do Quang Thien University of Sciences, Hue University, 77 Nguyen Hue, Hue, Vietnam

DOI:

https://doi.org/10.15625/2615-9783/17568

Keywords:

Atterberg’s limits, clay, cyclic shear condition, pore water pressure, relative density, sand

Abstract

For clarifying the effects of relative density (D_r) and Atterberg’s limits on the cyclic shear-induced pore water pressure properties of soils, sandy soils with similar index properties and clayey soils with different Atteberg’s limits were collected from Vietnam and Japan and used for this study. Specimens at D_r = 50% of Nam O sand and D_r = 70% of Toyoura sand, and those of Hue clay and Japanese Kaolin clay were consolidated under the vertical stress of σ_vo = 49 kPa. They were then subjected to undrained cyclic shear for various cyclic shear directions and wide ranges of the number of cycles and shear strain amplitudes. Under the same cyclic shearing conditions, specimens of sand at higher D_r (Toyoura sand) and clay with higher Atterberg’s limits (Kaolin) show a lower pore water pressure ratio. The number of cycles and the cumulative shear strain at the starting point of pore water pressure generation were observed for different soils and testing conditions. In addition, using the cumulative shear strain, a new strain path parameter, the effects of shear strain amplitude and cyclic shear direction can be captured, resulting in a unique u_acc/σ’_vo - G^* relation on each soil. Based on this, fitting lines can be drawn and referred to promote a prediction of the cyclic shear-induced pore water pressure accumulation for the used soils under different cyclic shear conditions.

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