TY - JOUR AU - Nhan, Tran Thanh AU - Matsuda, Hiroshi PY - 2020/01/15 Y2 - 2024/03/29 TI - Pore water pressure accumulation and settlement of clays with a wide range of Atterberg’s limits subjected to multi-directional cyclic shear JF - Vietnam Journal of Earth Sciences JA - Vietnam J. Earth Sci. VL - 42 IS - 1 SE - Articles DO - 10.15625/0866-7187/42/1/14761 UR - https://vjs.ac.vn/index.php/jse/article/view/14761 SP - 93-104 AB - <p class="abstract">In this study, normally consolidated specimens on four clays with a wide range of Atterberg’s limits were tested by applying several series of undrained multi-directional cyclic shear followed by drainage. The cyclic shear tests were carried out under the shear strain amplitudes (<em>γ</em> = 0.05%-2.00%), number of cycles <em>n</em> = 200 and the phase difference <em>θ</em> = 90<sup>o</sup>. Then the accumulation of cyclic shear-induced pore water pressure and the post-cyclic settlement in strain (<em>ε</em><em><sub>v</sub></em>, %) were observed and discussed. In conclusion, it is clarified that the pore water pressure ratio (<em>U<sub>dyn</sub>/</em><em>σ</em><em>’<sub>v</sub></em><em><sub>o</sub></em>) increases with <em>g</em> and the soils with higher Atterberg’s limits show lower <em>U<sub>dyn</sub>/</em><em>σ</em><em>’<sub>v</sub></em><em><sub>o</sub></em>, and under the multi-directional cyclic shear strain at <em>γ</em> &gt; 0.4%, Hue clay and Kaolinite clay with relatively low plasticity suffer from cyclic failure. In addition, the post-cyclic settlement has a tendency of decreasing with the Atterberg’s limits in the range of plasticity index from <em>I<sub>p</sub></em> = 25.5 to 63.8, meanwhile when <em>I<sub>p</sub></em> &lt; 25.5, different tendencies were observed e.g., Hue clay (with lower <em>I<sub>p</sub></em>) shows a smaller settlement compared with those on Kaolin (with higher <em>I<sub>p</sub></em>). Furthermore, the threshold number of cycles (<em>n<sub>tp</sub></em>) and cumulative shear strain (<em>G*<sub>tp</sub></em>) for pore water pressure buildup were then clarified.</p> ER -